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When this shows up on the exam
House and Small Buildings candidates get span questions in two forms. Either you are given the member (species, grade, size, spacing) and asked for the maximum span, or you are given a span and asked for the smallest member or the widest spacing that works. Roof questions often hide a snow load calculation first, because the roof tables are entered by specified snow load, not by city. Beam and lintel questions add a supported length calculation, an interpolation, or a percentage adjustment from a table note.
The method
- Check the tables apply. Floor spans in Subsection 9.23.4. are only for residential live loads; anything heavier goes to Part 4 design (OBC Div. B 9.23.4.1.OBC Div. B 9.23.4.1. Application(1) Spans provided in this Subsection for joists, beams and lintels supporting floors shall apply only where (a) the floors serve residential areas as described in Table 4.1.5.3., or (b) the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Tableβ¦).
- Pick the table by member type. Article 9.23.4.2.OBC Div. B 9.23.4.2. Spans for Joists, Rafters and Beams(1) Except as required in Sentence (2) and Article 9.23.14.10., spans for wood joists and rafters shall conform to the spans shown in Span Tables 9.23.4.2.-A to 9.23.4.2-G for the uniform live loads shown in the Tables. (See Article 9.4.2.2.) (2) Spans for floor joists that are not selected from Span Tables⦠sends you to:
- Floor joists: Table 9.23.4.2.-A (general cases, in three blocks: with strapping, with bridging, with strapping and bridging) or Table 9.23.4.2.-B (special cases: ceiling on wood furring, or concrete topping).
- Ceiling joists, attic not reached by a stair: Table 9.23.4.2.-C.
- Roof joists: Tables 9.23.4.2.-D (1.0 to 2.0Β kPa) and -E (2.5 and 3.0Β kPa).
- Rafters: Tables 9.23.4.2.-F (1.0 to 2.0Β kPa) and -G (2.5 and 3.0Β kPa).
- Built-up floor beams: Tables -H, -I and -J (supporting one, two or three floors). Glulam floor beams: Table -K.
- Ridge beams and roof-only lintels: Table 9.23.4.2.-LOBC Div. B Table 9.23.4.2-L. Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only β No. 1 or No. 2 Grade β Douglas Fir β Larch[4]Table 9.23.4.2.-L β Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only β No. 1 or No. 2 Grade β Douglas Fir β Larch[4] Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(4), 9.23.4.5.(1), 9.23.12.3.(1) and (3) and 9.23.14.10.(2) Beam or Lintel Size, mm | Specified Snow Load: 1.0β¦. Wall lintels: Tables 9.23.12.3.-A to -D (OBC Div. B 9.23.12.3.OBC Div. B 9.23.12.3. Lintel Spans and Sizes(1) Spans and sizes of wood lintels shall conform to the spans shown in Span Tables 9.23.4.2.-L and 9.23.12.3.-A to 9.23.12.3.-D (a) for buildings of residential occupancy, (b) where the wall studs exceed 38 mm by 64 mm in size, (c) where the spans of supported joists do not exceed 4.9 m, and (d) where the spans ofβ¦). Read the heading of each block, not just the table number. One table number often holds several blocks.
- For roofs, work out the specified snow load first (OBC Div. B 9.4.2.2.OBC Div. B 9.4.2.2. Specified Snow Loads(1) Except as provided in Sentences (2) and (4), specified snow loads shall be not less than those calculated using the following formula: S = C_bS_s + S_r where S = specified snow load, C_b = basic snow load roof factor, which is 0.45 where the entire width of a roof does not exceed 4.3 m and 0.55 for all otherβ¦): S = C_b Γ S_s + S_r. Take S_s and S_r for the town from SB-1 Table 2OBC SB-1 Table 2: Climatic Design DataTable 2: Climatic Design Data Location | Elevation, m | Design Temperature β January β 2.5%, Β°C | Design Temperature β January β 1%, Β°C | Design Temperature β July 2.5% β Dry, Β°C | Design Temperature β July 2.5% β Wet, Β°C | Degree Days Below 18Β°C | 15 Min Rain, mm | One Day Rain, 1/50, mm | Annual Rain, mm | Moistureβ¦. C_b is 0.45 when the entire roof width is 4.3Β m or less, and 0.55 for every other roof. S is never less than 1Β kPa.
- Choose the snow load block. The roof tables give 1.0, 1.5, 2.0, 2.5 and 3.0Β kPa. The joist and rafter tables say nothing about interpolating between loads, so use the block equal to S or the next one above it. Never round down.
- Find the row: species group (Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Northern Species), then grade, then size.
- Find the column: spacing (300, 400 or 600Β mm o.c.) for joists and rafters; number of plies for built-up beams; snow load for Table -L; exterior or interior wall for lintels.
- Apply the notes. For beams, supported length is half the sum of the joist spans on both sides, and straight interpolation between supported lengths is allowed (Table 9.23.4.2.-HOBC Div. B Table 9.23.4.2-H. Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 184 mm MembersTable 9.23.4.2.-H β Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 184 mm Members Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(3), 9.23.4.4.(3) and 9.23.8.1.(1) Commercial Designation | Grade | Supported Length, m | Size of Beam: 3 β 38 Γ 184 mm | Size of Beam: 4 β 38 Γ 184 mm |β¦ Notes 3 and 4). Beam spans are clear spans; add two bearing lengths for the total length (Note 5). A concrete topping of not more than 51Β mm cuts beam spans to 0.8 times the table value (OBC Div. B 9.23.4.4.(3)OBC Div. B 9.23.4.4. Concrete Topping(1) Except as permitted in Sentence (2), where a floor is required to support a concrete topping, the joist spans shown Span Table 9.23.4.2.-A or the spacing of the members shall be reduced to allow for the loads due to the topping. (2) Where a floor is required to support a concrete topping, joist spans are permittedβ¦). Table -L spans may go up 5%, 10% or 25% for short supported lengths (Note 1). Sawn lumber wall lintels may go up 5% or 10% when the supported rafter, joist and truss spans are short (Table 9.23.12.3.-COBC Div. B Table 9.23.12.3-C. Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 1.0 kPaTable 9.23.12.3.-C β Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 1.0 kPa Forming Part of Sentences 9.23.2.8.(1), 9.23.4.5.(1), 9.23.12.3.(1) and (3) Lintel Supporting | Lintel Size, mm | Exterior Walls, m | Interior Walls, m Limited atticβ¦ Note 6). Round a maximum span down, never up.
- Compare. The actual span must not exceed the table span. If it does, go up a size, close the spacing, or add plies.
Worked example 1
Floor joists, Spruce-Pine-Fir No. 1 and No. 2, 38 Γ 235Β mm at 400Β mm o.c. The clear span is 4.10Β m. Is strapping alone enough, or is bridging needed?
| Step | Lookup or arithmetic | Result |
|---|---|---|
| Table | Table 9.23.4.2.-AOBC Div. B Table 9.23.4.2-A. Maximum Spans for Floor Joists β General Cases with Strapping[2]Table 9.23.4.2.-A β Maximum Spans for Floor Joists β General Cases with Strapping[2] Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(1) and (2), 9.23.4.4.(1) and 9.23.9.4.(1) to (3) Commercial Designation | Grade | Joist Size, mm | Joist Spacing, 300 mm | Joist Spacing, 400 mm | Joist Spacing, 600 mm Douglas Fir ββ¦, residential floor | General cases |
| Strapping block | SPF, No. 1 and No. 2, 38 Γ 235 row, 400Β mm column | 3.96Β m |
| Check | 4.10Β m > 3.96Β m | Fails |
| Bridging block | Same row and column, "with Bridging" block | 4.17Β m |
| Check | 4.10Β m β€ 4.17Β m | Passes |
Answer: bridging is needed (strapping alone gives only 3.96Β m). The bridging must meet OBC Div. B 9.23.9.4.(2)OBC Div. B 9.23.9.4. Strapping, Bridging, Furring and Ceilings in Span Tables 9.23.4.2.-A and 9.23.4.2.-B)(1) Except as permitted by Sentence (5), where strapping is specified in Span Table 9.23.4.2.-A, it shall be (a) not less than 19 mm by 64 mm, nailed to the underside of floor joists, (b) located not more than 2,100 mm from each support or other rows of strapping, and (c) fastened at each end to a sill or header. (2)β¦.
Worked example 2
A house in Barrie has a gable roof 9.6Β m wide. Rafters are Spruce-Pine-Fir No. 1 and No. 2 at 400Β mm o.c. with a span of 4.40Β m. What rafter size works?
| Step | Lookup or arithmetic | Result |
|---|---|---|
| SB-1 Table 2, Barrie | S_s and S_r | 2.5Β kPa and 0.4Β kPa |
| C_b | Roof width 9.6Β m is more than 4.3Β m | 0.55 |
| S | 0.55 Γ 2.5 + 0.4 | 1.775Β kPa |
| Block | Next block at or above 1.775Β kPa | 2.0Β kPa |
| Table | Table 9.23.4.2.-FOBC Div. B Table 9.23.4.2-F. Maximum Spans for Roof Rafters β Specified Roof Snow Loads 1.0 kPaTable 9.23.4.2.-F β Maximum Spans for Roof Rafters β Specified Roof Snow Loads 1.0 kPa Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(1), 9.23.4.5.(1) and 9.23.14.10.(2) Commercial Designation | Grade | Rafter Size, mm | Rafter Spacing 300 mm | Rafter Spacing 400 mm | Rafter Spacing 600 mm Douglas Fir β Larch[1] |β¦, 2.0Β kPa block, SPF No. 1 and No. 2, 38 Γ 140 row, 400Β mm column | 3.53Β m (too short) |
| Next size | Same block, 38 Γ 184 row, 400Β mm column | 4.64Β m |
Answer: 38 Γ 184Β mm rafters (4.40Β m β€ 4.64Β m). If you had rounded 1.775Β kPa down to the 1.5Β kPa block you would have been reading longer, unsafe spans.
Worked example 3
A built-up floor beam of Spruce-Pine-Fir No. 1 and No. 2, 38 Γ 235Β mm plies, supports one floor. The joists span 3.6Β m on one side and 4.2Β m on the other. The beam's clear span is 3.40Β m. How many plies?
| Step | Lookup or arithmetic | Result |
|---|---|---|
| Supported length | (3.6 + 4.2) Γ· 2 | 3.9Β m |
| Table | Table 9.23.4.2.-HOBC Div. B Table 9.23.4.2-H. Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 184 mm MembersTable 9.23.4.2.-H β Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 184 mm Members Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(3), 9.23.4.4.(3) and 9.23.8.1.(1) Commercial Designation | Grade | Supported Length, m | Size of Beam: 3 β 38 Γ 184 mm | Size of Beam: 4 β 38 Γ 184 mm |β¦, 38 Γ 235Β mm block, SPF No. 1 and No. 2 | rows 3.60Β m and 4.20Β m |
| 3-ply | 3.22Β m at 3.60Β m and 2.98Β m at 4.20Β m; halfway | 3.10Β m (too short) |
| 4-ply | 3.71Β m at 3.60Β m and 3.44Β m at 4.20Β m; halfway | 3.575Β m, use 3.57Β m |
| Bearing | Note 6: not a 3-ply over 4.2Β m | 76Β mm each end |
Answer: 4 plies (3.40Β m β€ 3.57Β m). The beam is at least 3.40 + 2 Γ 0.076 = 3.552Β m long.
Common mistakes
- Using the roof joist table (D or E) for rafters, or the reverse. At the same load, the roof joist spans are shorter.
- Entering the roof table with S_s from SB-1 instead of the calculated S, or forgetting to add S_r.
- Using C_b = 0.55 for a narrow porch roof (4.3Β m wide or less takes 0.45), or forgetting the 1Β kPa minimum.
- Rounding S down to the lower snow block.
- Reading the strapping block of Table 9.23.4.2.-A when the floor has bridging, or the reverse.
- Taking the full joist span (or only the longer side) as the beam's supported length instead of half the sum of both sides.
- Not interpolating between supported lengths when the note allows it, or rounding an interpolated span up.
- Forgetting the 0.8 factor for a concrete topping on beams, or the bearing lengths when a total beam length is asked.
- Applying the wrong percentage for short supported lengths on ridge beams and lintels.
Find it fast in the code PDF
Bookmark path: Division B > Part 9 > Section 9.23 > Subsection 9.23.4. for joists, rafters and beams, then 9.23.12. for lintels. Snow loads: Division B > Part 9 > Section 9.4 > Subsection 9.4.2.
Ctrl+F terms that appear in the code text:
- "Maximum Spans for Floor Joists"
- "Specified Roof Snow Loads"
- "General Cases with Strapping"
- "Supported length means half the sum"
- "Straight interpolation may be used"
- "For total span, add two bearing lengths"
- "basic snow load roof factor"
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Code cited in this method
Based on the official 2024 Building Code Compendium on ontario.ca.
Β© King's Printer for Ontario, 2024. Reproduced with permission.
OBC Div. B 9.23.4.1. Application
Open OBC Div. B 9.23.4.1. in the code viewer(1)Spans provided in this Subsection for joists, beams and lintels supporting floors shall apply only where
(a)the floors serve residential areas as described in Table 4.1.5.3., or
(b)the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3.
(2)Spans for joists, beams and lintels supporting floors shall be determined according to Subsection 4.1.3. where the supported floors
(a)serve other than residential areas, or
(b)support a uniform live load in excess of that specified for residential areas.
OBC Div. B 9.23.4.2. Spans for Joists, Rafters and Beams
Open OBC Div. B 9.23.4.2. in the code viewer(1)Except as required in Sentence (2) and Article 9.23.14.10., spans for wood joists and rafters shall conform to the spans shown in Span Tables 9.23.4.2.-A to 9.23.4.2-G for the uniform live loads shown in the Tables. (See Article 9.4.2.2.)
(2)Spans for floor joists that are not selected from Span Tables 9.23.4.2.-A and 9.23.4.2-B and that are required to be designed for the same loading conditions, shall not exceed the design requirements for uniform loading and vibration criteria. (See Note A-9.23.4.2.(2))
(3)Spans for built-up wood and glued-laminated timber floor beams shall conform to the spans in Span Tables 9.23.4.2.-H to 9.23.4.2-K. (See Article 9.4.2.2.)
(4)Spans for roof ridge beams shall conform to the spans in Span Table 9.23.4.2.-L for the uniform snow load shown. (See Articles 9.4.2.2. and 9.23.14.8.)
OBC Div. B Table 9.23.4.2-L. Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only β No. 1 or No. 2 Grade β Douglas Fir β Larch[4]
Open OBC Div. B Table 9.23.4.2-L. in the code viewerTable 9.23.4.2.-L β Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only β No. 1 or No. 2 Grade β Douglas Fir β Larch[4] Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(4), 9.23.4.5.(1), 9.23.12.3.(1) and (3) and 9.23.14.10.(2) Beam or Lintel Size, mm | Specified Snow Load: 1.0 kPa[1][2][3] | Specified Snow Load: 1.5 kPa[1][2][3] | Specified Snow Load: 2.0 kPa[1][2][3] | Specified Snow Load: 2.5 kPa[1][2][3] | Specified Snow Load: 3.0 kPa[1][2][3] 3 β 38 Γ 184 | 2.65 m | 2.28 m | 2.03 m | 1.85 m | 1.71 m 4 β 38 Γ 184 | 3.06 m | 2.64 m | 2.35 m | 2.14 m | 1.97 m 5 β 38 Γ 184 | 3.43 m | 2.95 m | 2.62 m | 2.39 m | 2.21 m 3 β 38 Γ 235 | 3.25 m | 2.79 m | 2.49 m | 2.26 m | 2.09 m 4 β 38 Γ 235 | 3.75 m | 3.22 m | 2.87 m | 2.61 m | 2.41 m 5 β 38 Γ 235 | 4.19 m | 3.60 m | 3.21 m | 2.92 m | 2.70 m 3 β 38 Γ 286 | 3.77 m | 3.24 m | 2.88 m | 2.62 m | 2.43 m 4 β 38 Γ 286 | 4.35 m | 3.74 m | 3.33 m | 3.03 m | 2.80 m 5 β 38 Γ 286 | 4.86 m | 4.18 m | 3.72 m | 3.39 m | 3.13 m Table 9.23.4.2.-L (continued) β Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only β No. 1 or No. 2 Grade β Hem β Fir[5] Beam or Lintel Size, mm | Specified Snow Load: 1.0 kPa[1][2][3] | Specified Snow Load: 1.5 kPa[1][2][3] | Specified Snow Load: 2.0 kPa[1][2][3] | Specified Snow Load: 2.5 kPa[1][2][3] | Specified Snow Load: 3.0 kPa[1][2][3] 3 β 38 Γ 184 | 2.78 m | 2.39 m | 2.13 m | 1.94 m | 1.79 m 4 β 38 Γ 184 | 3.21 m | 2.76 m | 2.46 m | 2.24 m | 2.07 m 5 β 38 Γ 184 | 3.59 m | 3.09 m | 2.75 m | 2.50 m | 2.31 m 3 β 38 Γ 235 | 3.40 m | 2.93 m | 2.61 m | 2.37 m | 2.19 m 4 β 38 Γ 235 | 3.93 m | 3.38 m | 3.01 m | 2.74 m | 2.53 m 5 β 38 Γ 235 | 4.39 m | 3.78 m | 3.36 m | 3.06 m | 2.83 m 3 β 38 Γ 286 | 3.95 m | 3.40 m | 3.02 m | 2.75 m | 2.54 m 4 β 38 Γ 286 | 4.56 m | 3.92 m | 3.49 m | 3.18 m | 2.94 m 5 β 38 Γ 286 | 5.10 m | 4.38 m | 3.90 m | 3.55 m | 3.28 m Table 9.23.4.2.-L (continued) β Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only β No. 1 or No. 2 Grade β Spruce β Pine β Fir[6] Beam or Lintel Size, mm | Specified Snow Load: 1.0 kPa[1][2][3] | Specified Snow Load: 1.5 kPa[1][2][3] | Specified Snow Load: 2.0 kPa[1][2][3] | Specified Snow Load: 2.5 kPa[1][2][3] | Specified Snow Load: 3.0 kPa[1][2][3] 3 β 38 Γ 184 | 2.88 m | 2.48 m | 2.21 m | 2.01 m | 1.86 m 4 β 38 Γ 184 | 3.30 m | 2.86 m | 2.55 m | 2.32 m | 2.14 m 5 β 38 Γ 184 | 3.55 m | 3.10 m | 2.82 m | 2.59 m | 2.40 m 3 β 38 Γ 235 | 3.53 m | 3.03 m | 2.70 m | 2.46 m | 2.27 m 4 β 38 Γ 235 | 4.07 m | 3.50 m | 3.12 m | 2.84 m | 2.62 m 5 β 38 Γ 235 | 4.54 m | 3.91 m | 3.49 m | 3.17 m | 2.93 m 3 β 38 Γ 286 | 4.09 m | 3.52 m | 3.13 m | 2.85 m | 2.63 m 4 β 38 Γ 286 | 4.72 m | 4.06 m | 3.62 m | 3.29 m | 3.04 m 5 β 38 Γ 286 | 5.28 m | 4.54 m | 4.04 m | 3.68 m | 3.40 m Notes to Table 9.23.4.2.-L: (1) Beam and lintel spans are calculated based on a maximum supported length of 4.9 m. Spans may be increased by 5% for supported lengths of not more than 4.3 m, by 10% for supported lengths of not more than 3.7 m, and by 25% for supported lengths of not more than 2.4 m. (2) For ridge beams, supported length means half the sum of the rafter, joist or truss spans on both sides of the beam. For lintels, supported length means half the sum of truss, roof joist or rafter spans supported by the lintel plus the length of the overhang beyond the lintel. (3) Provide a minimum bearing length of 76 mm. (4) Includes Douglas Fir and Western Larch. (5) Includes Western Hemlock and Amabilis Fir. (6) Includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir.
OBC Div. B 9.23.12.3. Lintel Spans and Sizes
Open OBC Div. B 9.23.12.3. in the code viewer(1)Spans and sizes of wood lintels shall conform to the spans shown in Span Tables 9.23.4.2.-L and 9.23.12.3.-A to 9.23.12.3.-D
(a)for buildings of residential occupancy,
(b)where the wall studs exceed 38 mm by 64 mm in size,
(c)where the spans of supported joists do not exceed 4.9 m, and
(d)where the spans of trusses do not exceed 9.8 m.
(2)In loadbearing exterior and interior walls of 38 mm by 64 mm framing members, lintels shall consist of
(a)64 mm thick members on edge, or
(b)38 mm thick and 19 mm thick members fastened together with a double row of nails not less than 63 mm long and spaced not more than 450 mm apart.
(3)Lintels referred to in Sentence (2)
(a)shall be not less than 50 mm greater in depth than those shown in Span Tables 9.23.4.2.-L and 9.23.12.3.-A to 9.23.12.3.-D for the maximum spans shown, and
(b)shall not exceed 2.24 m in length.
OBC Div. B 9.4.2.2. Specified Snow Loads
Open OBC Div. B 9.4.2.2. in the code viewer(1)Except as provided in Sentences (2) and (4), specified snow loads shall be not less than those calculated using the following formula:
S = C_bS_s + S_r
where
S = specified snow load,
C_b = basic snow load roof factor, which is 0.45 where the entire width of a roof does not exceed 4.3 m and 0.55 for all other roofs,
S_s = 1 -in-50 year ground snow load in kPa, determined according to MMAH Supplementary Standard SB-1, "Climatic and Seismic Data," and
S_r = associated 1-in-50 year rain load in kPa, determined according to MMAH Supplementary Standard SB-1, "Climatic and Seismic Data."
(2)In no case shall the specified snow load be less than 1 kPa.
(3)Bow string, arch or semi-circular roof trusses having an unsupported span greater than 6 m shall be designed in conformance with the snow load requirements in Subsection 4.1.6.
(4)Where the height of a roof step at the intersection of an upper level roof and a lower level roof is greater than 2 m, and the upper level roof has a slope less than 1 in 6 and an area greater than 600 mΒ², the specified snow load on the lower level roof shall be
(a)for distances from the roof step that are less than or equal to the drift length, x_d , calculated in accordance with Sentence (5), not less than 1.5 times the specified snow load, S, calculated using the formula in Sentence (1) with C_b equal to 0.55, and
(b)for distances from the roof step that are greater than the drift length, x_d , calculated in accordance with Sentence (5), as specified in Sentence (1).
(5)For the purposes of Sentence (4), the drift length, x_d , in m, shall be calculated as follows:
x_rmd = 5(h - (0.55S_rms)/(Ξ³))
where
h = height of the roof step, in m, and
Ξ³ = specific weight of snow as specified in Clause 9.4.2.1.(1)(f).
OBC SB-1 Table 2: Climatic Design Data
Open OBC SB-1 in the code viewerTable 2: Climatic Design Data
Location | Elevation, m | Design Temperature β January β 2.5%, Β°C | Design Temperature β January β 1%, Β°C | Design Temperature β July 2.5% β Dry, Β°C | Design Temperature β July 2.5% β Wet, Β°C | Degree Days Below 18Β°C | 15 Min Rain, mm | One Day Rain, 1/50, mm | Annual Rain, mm | Moisture Index | Annual Total Precipitation, mm | Driving Rain Wind Pressures, Pa, 1/5 | Snow Load, kPa, 1/50 β Ss | Snow Load, kPa, 1/50 β Sr | Hourly Wind Pressures, kPa β 1/10 | Hourly Wind Pressures, kPa β 1/50
Ailsa Craig | 230 | -17 | -19 | 30 | 23 | 3840 | 25 | 103 | 800 | 0.9 | 950 | 180 | 2.2 | 0.4 | 0.37 | 0.48
Ajax | 95 | -20 | -22 | 30 | 23 | 3820 | 23 | 92 | 760 | 0.9 | 825 | 160 | 1.0 | 0.4 | 0.37 | 0.48
Alexandria | 80 | -24 | -26 | 30 | 23 | 4600 | 25 | 103 | 800 | 0.9 | 975 | 160 | 2.4 | 0.4 | 0.31 | 0.4
Alliston | 220 | -23 | -25 | 29 | 23 | 4200 | 28 | 113 | 690 | 0.8 | 875 | 120 | 2.0 | 0.4 | 0.28 | 0.36
Almonte | 120 | -26 | -28 | 30 | 23 | 4620 | 25 | 97 | 730 | 0.8 | 800 | 140 | 2.5 | 0.4 | 0.32 | 0.41
Armstrong | 340 | -37 | -40 | 28 | 21 | 6500 | 23 | 97 | 525 | 0.8 | 725 | 100 | 2.7 | 0.4 | 0.22 | 0.3
Arnprior | 85 | -27 | -29 | 30 | 23 | 4680 | 23 | 86 | 630 | 0.8 | 775 | 140 | 2.5 | 0.4 | 0.29 | 0.37
Atikokan | 400 | -33 | -35 | 29 | 22 | 5750 | 25 | 103 | 570 | 0.8 | 760 | 100 | 2.4 | 0.3 | 0.22 | 0.3
Attawapiskat | 10 | -37 | -39 | 28 | 21 | 7100 | 18 | 81 | 450 | 0.8 | 650 | 160 | 2.8 | 0.3 | 0.3 | 0.41
Aurora | 270 | -21 | -23 | 30 | 23 | 4210 | 28 | 108 | 700 | 0.8 | 800 | 140 | 2.0 | 0.4 | 0.34 | 0.44
Bancroft | 365 | -28 | -31 | 29 | 23 | 4740 | 25 | 92 | 720 | 0.9 | 900 | 100 | 3.1 | 0.4 | 0.25 | 0.32
Barrie | 245 | -24 | -26 | 29 | 23 | 4380 | 28 | 97 | 700 | 0.8 | 900 | 120 | 2.5 | 0.4 | 0.28 | 0.36
Barriefield | 100 | -22 | -24 | 28 | 23 | 3990 | 23 | 108 | 780 | 1.0 | 950 | 160 | 2.1 | 0.4 | 0.37 | 0.47
Beaverton | 240 | -24 | -26 | 30 | 23 | 4300 | 25 | 108 | 720 | 0.9 | 950 | 120 | 2.2 | 0.4 | 0.28 | 0.36
Belleville | 90 | -22 | -24 | 29 | 23 | 3910 | 23 | 97 | 760 | 0.9 | 850 | 180 | 1.7 | 0.4 | 0.34 | 0.43
Belmont | 260 | -17 | -19 | 30 | 24 | 3840 | 25 | 97 | 850 | 1.0 | 950 | 180 | 1.7 | 0.4 | 0.37 | 0.47
Big Trout Lake (Kitchenuhmaykoosib) | 215 | -38 | -40 | 26 | 20 | 7450 | 18 | 92 | 400 | 0.75 | 600 | 150 | 3.2 | 0.2 | 0.31 | 0.42
Borden (CBF) | 225 | -23 | -25 | 29 | 23 | 4300 | 28 | 103 | 690 | 0.82 | 875 | 120 | 2.2 | 0.4 | 0.28 | 0.36
Bracebridge | 310 | -26 | -28 | 29 | 23 | 4800 | 25 | 103 | 830 | 1.0 | 1050 | 120 | 3.1 | 0.4 | 0.27 | 0.35
Bradford | 240 | -23 | -25 | 30 | 23 | 4280 | 28 | 108 | 680 | 0.8 | 800 | 120 | 2.1 | 0.4 | 0.28 | 0.36
Brampton | 215 | -19 | -21 | 30 | 23 | 4100 | 28 | 119 | 720 | 0.8 | 820 | 140 | 1.3 | 0.4 | 0.34 | 0.44
Brantford | 205 | -18 | -20 | 30 | 23 | 3900 | 23 | 103 | 780 | 0.9 | 850 | 160 | 1.3 | 0.4 | 0.33 | 0.42
Brighton | 95 | -21 | -23 | 29 | 23 | 4000 | 23 | 94 | 760 | 0.9 | 850 | 160 | 1.6 | 0.4 | 0.37 | 0.48
Brockville | 85 | -23 | -25 | 29 | 23 | 4060 | 25 | 103 | 770 | 0.9 | 975 | 180 | 2.2 | 0.4 | 0.34 | 0.44
Burk's Falls | 305 | -26 | -28 | 29 | 22 | 5020 | 25 | 97 | 810 | 0.9 | 1010 | 120 | 2.7 | 0.4 | 0.27 | 0.35
Burlington | 80 | -17 | -19 | 31 | 23 | 3740 | 23 | 103 | 770 | 0.9 | 850 | 160 | 1.1 | 0.4 | 0.36 | 0.46
Caledon | 425 | -21 | -23 | 30 | 23 | 4450 | 28 | 119 | 730 | 0.84 | 875 | 140 | 2.2 | 0.4 | 0.31 | 0.4
Cambridge | 295 | -18 | -20 | 29 | 23 | 4100 | 25 | 113 | 800 | 0.9 | 890 | 160 | 1.6 | 0.4 | 0.28 | 0.36
Campbellford | 150 | -23 | -26 | 30 | 23 | 4280 | 25 | 97 | 730 | 0.9 | 850 | 160 | 1.7 | 0.4 | 0.32 | 0.41
Cannington | 255 | -24 | -26 | 30 | 23 | 4310 | 25 | 108 | 740 | 0.9 | 950 | 120 | 2.2 | 0.4 | 0.28 | 0.36
Carleton Place | 135 | -25 | -27 | 30 | 23 | 4600 | 25 | 97 | 730 | 0.8 | 850 | 160 | 2.5 | 0.4 | 0.32 | 0.41
Cavan | 200 | -23 | -25 | 30 | 23 | 4400 | 25 | 97 | 740 | 0.9 | 850 | 140 | 2.0 | 0.4 | 0.34 | 0.44
Centralia | 260 | -17 | -19 | 30 | 23 | 3800 | 25 | 103 | 820 | 1.0 | 1000 | 180 | 2.3 | 0.4 | 0.37 | 0.48
Chapleau | 425 | -35 | -38 | 27 | 21 | 5900 | 20 | 97 | 530 | 0.7 | 850 | 80 | 3.6 | 0.4 | 0.23 | 0.3
Chatham | 180 | -16 | -18 | 31 | 24 | 3470 | 28 | 103 | 800 | 0.9 | 850 | 180 | 1.0 | 0.4 | 0.34 | 0.43
Chesley | 275 | -19 | -21 | 29 | 22 | 4320 | 28 | 103 | 810 | 0.9 | 1125 | 140 | 2.8 | 0.4 | 0.35 | 0.45
Clinton | 280 | -17 | -19 | 29 | 23 | 4150 | 25 | 103 | 810 | 0.9 | 1000 | 160 | 2.6 | 0.4 | 0.36 | 0.46
Coboconk | 270 | -25 | -27 | 30 | 23 | 4500 | 25 | 108 | 740 | 0.9 | 950 | 120 | 2.5 | 0.4 | 0.27 | 0.35
Cobourg | 90 | -21 | -23 | 29 | 23 | 3980 | 23 | 94 | 760 | 0.9 | 825 | 160 | 1.2 | 0.4 | 0.38 | 0.49
Cochrane | 245 | -34 | -36 | 29 | 21 | 6200 | 20 | 92 | 575 | 0.8 | 875 | 80 | 2.8 | 0.3 | 0.27 | 0.35
Colborne | 105 | -21 | -23 | 29 | 23 | 3980 | 23 | 94 | 760 | 0.9 | 850 | 160 | 1.6 | 0.4 | 0.38 | 0.49
Collingwood | 190 | -21 | -23 | 29 | 23 | 4180 | 28 | 97 | 720 | 0.9 | 950 | 160 | 2.7 | 0.4 | 0.3 | 0.39
Cornwall | 35 | -23 | -25 | 30 | 23 | 4250 | 25 | 103 | 780 | 0.9 | 960 | 180 | 2.2 | 0.4 | 0.32 | 0.41
Corunna | 185 | -16 | -18 | 31 | 24 | 3600 | 25 | 100 | 760 | 0.9 | 800 | 180 | 1.0 | 0.4 | 0.37 | 0.47
Deep River | 145 | -29 | -32 | 30 | 22 | 4900 | 23 | 92 | 650 | 0.8 | 850 | 100 | 2.5 | 0.4 | 0.27 | 0.35
Deseronto | 85 | -22 | -24 | 29 | 23 | 4070 | 23 | 92 | 760 | 0.9 | 900 | 160 | 1.9 | 0.4 | 0.34 | 0.43
Dorchester | 260 | -18 | -20 | 30 | 24 | 3900 | 28 | 103 | 850 | 1.0 | 950 | 180 | 1.9 | 0.4 | 0.37 | 0.47
Dorion | 200 | -33 | -35 | 28 | 21 | 5950 | 20 | 103 | 550 | 0.8 | 725 | 160 | 2.8 | 0.4 | 0.29 | 0.39
Dresden | 185 | -16 | -18 | 31 | 24 | 3750 | 28 | 97 | 760 | 0.8 | 820 | 180 | 1.0 | 0.4 | 0.34 | 0.43
Dryden | 370 | -34 | -36 | 28 | 22 | 5850 | 25 | 97 | 550 | 0.7 | 700 | 120 | 2.4 | 0.3 | 0.22 | 0.3
Dundalk | 525 | -22 | -24 | 29 | 22 | 4700 | 28 | 108 | 750 | 0.9 | 1080 | 150 | 3.2 | 0.4 | 0.33 | 0.42
Dunnville | 175 | -15 | -17 | 30 | 24 | 3660 | 23 | 108 | 830 | 1.0 | 950 | 160 | 2.0 | 0.4 | 0.36 | 0.46
Durham | 340 | -20 | -22 | 29 | 22 | 4340 | 28 | 103 | 815 | 0.9 | 1025 | 140 | 2.8 | 0.4 | 0.34 | 0.44
Dutton | 225 | -16 | -18 | 31 | 24 | 3700 | 28 | 92 | 850 | 1.0 | 925 | 180 | 1.3 | 0.4 | 0.37 | 0.47
Earlton | 245 | -33 | -36 | 29 | 22 | 5730 | 23 | 92 | 560 | 0.8 | 820 | 120 | 3.1 | 0.4 | 0.35 | 0.45
Edison | 365 | -34 | -36 | 28 | 22 | 5740 | 25 | 108 | 510 | 0.7 | 680 | 120 | 2.4 | 0.3 | 0.23 | 0.31
Elliot Lake | 380 | -26 | -28 | 29 | 21 | 4950 | 23 | 108 | 630 | 0.8 | 950 | 160 | 2.9 | 0.4 | 0.3 | 0.38
Elmvale | 220 | -24 | -26 | 29 | 23 | 4200 | 28 | 97 | 720 | 0.9 | 950 | 140 | 2.6 | 0.4 | 0.28 | 0.36
Embro | 310 | -19 | -21 | 30 | 23 | 3950 | 28 | 113 | 830 | 0.9 | 950 | 160 | 2.0 | 0.4 | 0.37 | 0.48
Englehart | 205 | -33 | -36 | 29 | 22 | 5800 | 23 | 92 | 600 | 0.8 | 880 | 100 | 2.8 | 0.4 | 0.32 | 0.41
Espanola | 220 | -25 | -27 | 29 | 21 | 4920 | 23 | 108 | 650 | 0.8 | 840 | 160 | 2.3 | 0.4 | 0.33 | 0.42
Exeter | 265 | -17 | -19 | 30 | 23 | 3900 | 25 | 113 | 810 | 0.9 | 975 | 180 | 2.4 | 0.4 | 0.37 | 0.48
Fenelon Falls | 260 | -25 | -27 | 30 | 23 | 4440 | 25 | 108 | 730 | 0.9 | 950 | 120 | 2.3 | 0.4 | 0.28 | 0.36
Fergus | 400 | -20 | -22 | 29 | 23 | 4300 | 28 | 108 | 760 | 0.9 | 925 | 160 | 2.2 | 0.4 | 0.28 | 0.36
Forest | 215 | -16 | -18 | 31 | 23 | 3740 | 25 | 103 | 810 | 1.0 | 875 | 160 | 2.0 | 0.4 | 0.37 | 0.48
Fort Erie | 180 | -15 | -17 | 30 | 24 | 3650 | 23 | 108 | 860 | 1.0 | 1020 | 160 | 2.3 | 0.4 | 0.36 | 0.46
Fort Erie (Ridgeway) | 190 | -15 | -17 | 30 | 24 | 3600 | 25 | 108 | 860 | 1.0 | 1000 | 160 | 2.3 | 0.4 | 0.36 | 0.46
Fort Frances | 340 | -33 | -35 | 29 | 22 | 5440 | 25 | 108 | 570 | 0.7 | 725 | 120 | 2.3 | 0.3 | 0.23 | 0.31
Gananoque | 80 | -22 | -24 | 28 | 23 | 4010 | 23 | 103 | 760 | 0.9 | 900 | 180 | 2.1 | 0.4 | 0.37 | 0.47
Geraldton | 345 | -36 | -39 | 28 | 21 | 6450 | 20 | 86 | 550 | 0.8 | 725 | 100 | 2.9 | 0.4 | 0.22 | 0.3
Glencoe | 215 | -16 | -18 | 31 | 24 | 3680 | 28 | 103 | 800 | 0.9 | 925 | 180 | 1.5 | 0.4 | 0.34 | 0.43
Goderich | 185 | -16 | -18 | 29 | 23 | 4000 | 25 | 92 | 810 | 1.0 | 950 | 180 | 2.4 | 0.4 | 0.37 | 0.48
Gore Bay | 205 | -24 | -26 | 28 | 22 | 4700 | 23 | 92 | 640 | 0.8 | 860 | 160 | 2.6 | 0.4 | 0.34 | 0.44
Graham | 495 | -35 | -37 | 29 | 22 | 5940 | 23 | 97 | 570 | 0.8 | 750 | 140 | 2.6 | 0.3 | 0.22 | 0.3
Gravenhurst (Muskoka Airport) | 255 | -26 | -28 | 29 | 23 | 4760 | 25 | 103 | 790 | 0.9 | 1050 | 120 | 2.7 | 0.4 | 0.28 | 0.36
Grimsby | 85 | -16 | -18 | 30 | 23 | 3520 | 23 | 108 | 760 | 0.9 | 875 | 160 | 0.9 | 0.4 | 0.36 | 0.46
Guelph | 340 | -19 | -21 | 29 | 23 | 4270 | 28 | 103 | 770 | 0.9 | 875 | 140 | 1.9 | 0.4 | 0.28 | 0.36
Guthrie | 280 | -24 | -26 | 29 | 23 | 4300 | 28 | 103 | 700 | 0.8 | 950 | 120 | 2.5 | 0.4 | 0.28 | 0.36
Haileybury | 210 | -32 | -35 | 30 | 22 | 5600 | 23 | 92 | 590 | 0.8 | 820 | 120 | 2.4 | 0.4 | 0.34 | 0.44
Haldimand (Caledonia) | 190 | -18 | -20 | 30 | 23 | 3750 | 23 | 108 | 810 | 0.9 | 875 | 160 | 1.2 | 0.4 | 0.34 | 0.44
Haldimand (Hagersville) | 215 | -17 | -19 | 30 | 23 | 3760 | 25 | 97 | 840 | 1.0 | 875 | 160 | 1.3 | 0.4 | 0.36 | 0.46
Haliburton | 335 | -27 | -29 | 29 | 23 | 4840 | 25 | 92 | 780 | 0.9 | 980 | 100 | 2.9 | 0.4 | 0.27 | 0.35
Halton Hills (Georgetown) | 255 | -19 | -21 | 30 | 23 | 4200 | 28 | 119 | 750 | 0.8 | 850 | 140 | 1.4 | 0.4 | 0.29 | 0.37
Hamilton β Above Escarpment - West of John C. Munro Int'l Airport | 240 | -17 | -19 | 31 | 23 | 3460 | 23 | 108 | 810 | 0.9 | 875 | 160 | 1.5 | 0.4 | 0.36 | 0.46
Hamilton β Above Escarpment - East of John C. Munro Int'l Airport | 200 | -17 | -19 | 31 | 23 | 3460 | 23 | 108 | 810 | 0.9 | 875 | 160 | 1.3 | 0.4 | 0.36 | 0.46
Hamilton β Below Escarpment - West of Highway 403 | 90 | -17 | -19 | 31 | 23 | 3460 | 23 | 108 | 810 | 0.9 | 875 | 160 | 1.1 | 0.4 | 0.36 | 0.46
Hamilton β Below Escarpment - East of Highway 403 | 90 | -17 | -19 | 31 | 23 | 3460 | 23 | 108 | 810 | 0.9 | 875 | 160 | 1.1 | 0.4 | 0.36 | 0.46
Hanover | 270 | -19 | -21 | 29 | 22 | 4300 | 28 | 103 | 790 | 0.9 | 1050 | 140 | 2.6 | 0.4 | 0.34 | 0.44
Hastings | 200 | -24 | -26 | 30 | 23 | 4280 | 25 | 92 | 730 | 0.9 | 840 | 140 | 2.0 | 0.4 | 0.32 | 0.41
Hawkesbury | 50 | -25 | -27 | 30 | 23 | 4610 | 23 | 103 | 800 | 0.9 | 925 | 160 | 2.3 | 0.4 | 0.32 | 0.41
Hearst | 245 | -35 | -37 | 29 | 21 | 6450 | 20 | 86 | 520 | 0.7 | 825 | 80 | 2.8 | 0.3 | 0.23 | 0.3
Honey Harbour | 180 | -24 | -26 | 29 | 23 | 4300 | 25 | 97 | 710 | 0.9 | 1050 | 160 | 2.7 | 0.4 | 0.3 | 0.39
Hornepayne | 360 | -37 | -40 | 28 | 21 | 6340 | 20 | 93 | 420 | 0.7 | 750 | 80 | 3.3 | 0.4 | 0.22 | 0.3
Huntsville | 335 | -26 | -29 | 29 | 22 | 4850 | 25 | 103 | 800 | 0.9 | 1000 | 120 | 2.9 | 0.4 | 0.27 | 0.35
Ingersoll | 280 | -18 | -20 | 30 | 23 | 3920 | 28 | 108 | 840 | 1.0 | 950 | 180 | 1.7 | 0.4 | 0.37 | 0.48
Iroquois Falls | 275 | -33 | -36 | 29 | 21 | 6100 | 20 | 86 | 575 | 0.8 | 825 | 100 | 2.9 | 0.3 | 0.29 | 0.37
Jellicoe | 330 | -36 | -39 | 28 | 21 | 6400 | 20 | 86 | 550 | 0.8 | 750 | 100 | 2.7 | 0.4 | 0.22 | 0.3
Kapuskasing | 245 | -34 | -36 | 29 | 21 | 6250 | 20 | 86 | 550 | 0.8 | 825 | 100 | 3.0 | 0.3 | 0.24 | 0.31
Kemptville | 90 | -25 | -27 | 30 | 23 | 4540 | 25 | 92 | 750 | 0.9 | 925 | 160 | 2.3 | 0.4 | 0.32 | 0.41
Kenora | 370 | -33 | -35 | 28 | 22 | 5630 | 25 | 113 | 515 | 0.6 | 630 | 120 | 2.5 | 0.3 | 0.23 | 0.31
Killaloe | 185 | -28 | -31 | 30 | 22 | 4960 | 23 | 86 | 680 | 0.8 | 825 | 120 | 2.7 | 0.4 | 0.27 | 0.35
Kincardine | 190 | -17 | -19 | 28 | 22 | 3890 | 25 | 92 | 800 | 1.0 | 950 | 180 | 2.6 | 0.4 | 0.37 | 0.48
Kingston | 80 | -22 | -24 | 28 | 23 | 4000 | 23 | 108 | 780 | 1.0 | 950 | 180 | 2.1 | 0.4 | 0.37 | 0.47
Kinmount | 295 | -26 | -28 | 29 | 23 | 4600 | 25 | 108 | 750 | 0.9 | 950 | 120 | 2.7 | 0.4 | 0.27 | 0.35
Kirkland Lake | 325 | -33 | -36 | 29 | 22 | 6000 | 23 | 92 | 600 | 0.8 | 875 | 100 | 2.9 | 0.3 | 0.3 | 0.39
Kitchener | 335 | -19 | -21 | 29 | 23 | 4200 | 28 | 119 | 780 | 0.9 | 925 | 140 | 2.0 | 0.4 | 0.29 | 0.37
Lakefield | 240 | -24 | -26 | 30 | 23 | 4330 | 25 | 92 | 720 | 0.9 | 850 | 140 | 2.2 | 0.4 | 0.3 | 0.38
Lansdowne House | 240 | -38 | -40 | 28 | 21 | 7150 | 23 | 92 | 500 | 0.8 | 680 | 140 | 3.0 | 0.2 | 0.24 | 0.32
Leamington | 190 | -15 | -17 | 31 | 24 | 3400 | 28 | 113 | 800 | 0.9 | 875 | 180 | 0.8 | 0.4 | 0.37 | 0.47
Lindsay | 265 | -24 | -26 | 30 | 23 | 4320 | 25 | 103 | 720 | 0.8 | 850 | 140 | 2.3 | 0.4 | 0.3 | 0.38
Lion's Head | 185 | -19 | -21 | 27 | 22 | 4300 | 25 | 103 | 700 | 0.9 | 950 | 180 | 2.7 | 0.4 | 0.37 | 0.48
Listowel | 380 | -19 | -21 | 29 | 23 | 4300 | 28 | 119 | 800 | 0.9 | 1000 | 160 | 2.6 | 0.4 | 0.34 | 0.43
London | 245 | -18 | -20 | 30 | 24 | 3900 | 28 | 103 | 825 | 0.9 | 975 | 180 | 1.9 | 0.4 | 0.37 | 0.47
Lucan | 300 | -17 | -19 | 30 | 23 | 3900 | 25 | 113 | 810 | 0.9 | 1000 | 180 | 2.3 | 0.4 | 0.37 | 0.48
Maitland | 85 | -23 | -25 | 29 | 23 | 4080 | 25 | 103 | 770 | 0.9 | 975 | 180 | 2.2 | 0.4 | 0.34 | 0.44
Markdale | 425 | -20 | -22 | 29 | 22 | 4500 | 28 | 103 | 820 | 0.9 | 1050 | 160 | 3.2 | 0.4 | 0.32 | 0.41
Markham | 175 | -21 | -23 | 31 | 24 | 4000 | 25 | 86 | 720 | 0.8 | 825 | 140 | 1.3 | 0.4 | 0.34 | 0.44
Martin | 485 | -35 | -37 | 29 | 22 | 5900 | 25 | 103 | 560 | 0.8 | 750 | 120 | 2.6 | 0.3 | 0.22 | 0.3
Matheson | 265 | -33 | -36 | 29 | 21 | 6080 | 20 | 86 | 580 | 0.8 | 825 | 100 | 2.8 | 0.3 | 0.3 | 0.39
Mattawa | 165 | -29 | -31 | 30 | 22 | 5050 | 23 | 86 | 700 | 0.9 | 875 | 100 | 2.1 | 0.4 | 0.25 | 0.32
Midland | 190 | -24 | -26 | 29 | 23 | 4200 | 25 | 97 | 740 | 0.9 | 1060 | 160 | 2.7 | 0.4 | 0.3 | 0.39
Milton | 200 | -18 | -20 | 30 | 23 | 3920 | 25 | 125 | 750 | 0.9 | 850 | 160 | 1.3 | 0.4 | 0.34 | 0.43
Milverton | 370 | -19 | -21 | 29 | 23 | 4200 | 28 | 108 | 800 | 0.9 | 1050 | 160 | 2.4 | 0.4 | 0.34 | 0.43
Minden | 270 | -27 | -29 | 29 | 23 | 4640 | 25 | 97 | 780 | 0.9 | 1010 | 100 | 2.7 | 0.4 | 0.27 | 0.35
Mississauga | 160 | -18 | -20 | 30 | 23 | 3880 | 25 | 113 | 720 | 0.9 | 800 | 160 | 1.1 | 0.4 | 0.34 | 0.44
Mississauga (Lester B. Pearson International Airport) | 170 | -20 | -22 | 31 | 24 | 3890 | 26 | 108 | 685 | 0.8 | 790 | 160 | 1.1 | 0.4 | 0.34 | 0.44
Mississauga (Port Credit) | 75 | -18 | -20 | 29 | 23 | 3780 | 25 | 108 | 720 | 0.9 | 800 | 160 | 0.9 | 0.4 | 0.37 | 0.48
Mitchell | 335 | -18 | -20 | 29 | 23 | 4100 | 28 | 113 | 810 | 0.9 | 1050 | 160 | 2.4 | 0.4 | 0.35 | 0.45
Moosonee | 10 | -36 | -38 | 28 | 22 | 6800 | 18 | 81 | 500 | 0.8 | 700 | 160 | 2.7 | 0.3 | 0.26 | 0.35
Morrisburg | 75 | -23 | -25 | 30 | 23 | 4370 | 25 | 103 | 800 | 0.9 | 950 | 180 | 2.3 | 0.4 | 0.32 | 0.41
Mount Forest | 420 | -21 | -24 | 28 | 22 | 4700 | 28 | 103 | 740 | 0.9 | 940 | 140 | 2.7 | 0.4 | 0.32 | 0.41
Nakina | 325 | -36 | -38 | 28 | 21 | 6500 | 20 | 86 | 540 | 0.8 | 750 | 100 | 2.8 | 0.4 | 0.22 | 0.3
Nanticoke (Jarvis) | 205 | -17 | -18 | 30 | 23 | 3700 | 28 | 108 | 840 | 1.0 | 900 | 160 | 1.4 | 0.4 | 0.37 | 0.48
Nanticoke (Port Dover) | 180 | -15 | -17 | 30 | 24 | 3600 | 25 | 108 | 860 | 1.0 | 950 | 140 | 1.2 | 0.4 | 0.37 | 0.48
Napanee | 90 | -22 | -24 | 29 | 23 | 4140 | 23 | 92 | 770 | 0.9 | 900 | 160 | 1.9 | 0.4 | 0.34 | 0.43
Newcastle | 115 | -20 | -22 | 30 | 23 | 3990 | 23 | 86 | 760 | 0.9 | 830 | 160 | 1.5 | 0.4 | 0.37 | 0.48
Newcastle (Bowmanville) | 95 | -20 | -22 | 30 | 23 | 4000 | 23 | 86 | 760 | 0.9 | 830 | 160 | 1.4 | 0.4 | 0.37 | 0.48
New Liskeard | 180 | -32 | -35 | 30 | 22 | 5570 | 23 | 92 | 570 | 0.8 | 810 | 100 | 2.6 | 0.4 | 0.34 | 0.43
Newmarket | 185 | -22 | -24 | 30 | 23 | 4260 | 28 | 108 | 700 | 0.8 | 800 | 140 | 2.0 | 0.4 | 0.3 | 0.38
Niagara Falls | 210 | -16 | -18 | 30 | 23 | 3600 | 23 | 96 | 810 | 0.9 | 950 | 160 | 1.8 | 0.4 | 0.34 | 0.43
North Bay | 210 | -28 | -30 | 28 | 22 | 5150 | 25 | 95 | 775 | 0.9 | 975 | 120 | 2.2 | 0.4 | 0.27 | 0.34
Norwood | 225 | -24 | -26 | 30 | 23 | 4320 | 25 | 92 | 720 | 0.8 | 850 | 120 | 2.1 | 0.4 | 0.32 | 0.41
Oakville | 90 | -18 | -20 | 30 | 23 | 3760 | 23 | 97 | 750 | 0.9 | 850 | 160 | 1.1 | 0.4 | 0.37 | 0.47
Orangeville | 430 | -21 | -23 | 29 | 23 | 4450 | 28 | 108 | 730 | 0.8 | 875 | 140 | 2.3 | 0.4 | 0.28 | 0.36
Orillia | 230 | -25 | -27 | 29 | 23 | 4260 | 25 | 103 | 740 | 0.9 | 1000 | 120 | 2.4 | 0.4 | 0.28 | 0.36
Oshawa | 110 | -19 | -21 | 30 | 23 | 3860 | 23 | 86 | 760 | 0.9 | 875 | 160 | 1.4 | 0.4 | 0.37 | 0.48
Ottawa (Barrhaven) | 98 | -25 | -27 | 30 | 23 | 4500 | 25 | 92 | 750 | 0.8 | 900 | 160 | 2.4 | 0.4 | 0.32 | 0.41
Ottawa (City Hall) | 70 | -25 | -27 | 30 | 23 | 4440 | 23 | 86 | 750 | 0.8 | 900 | 160 | 2.4 | 0.4 | 0.32 | 0.41
Ottawa (Kanata) | 98 | -25 | -27 | 30 | 23 | 4520 | 25 | 92 | 730 | 0.8 | 900 | 160 | 2.5 | 0.4 | 0.32 | 0.41
Ottawa (MacDonald-Cartier Int'l Airport) | 125 | -25 | -27 | 30 | 23 | 4500 | 24 | 89 | 750 | 0.8 | 900 | 160 | 2.4 | 0.4 | 0.32 | 0.41
Ottawa (Orleans) | 70 | -26 | -28 | 30 | 23 | 4500 | 23 | 91 | 750 | 0.8 | 900 | 160 | 2.4 | 0.4 | 0.32 | 0.41
Owen Sound | 215 | -19 | -21 | 29 | 22 | 4030 | 28 | 113 | 760 | 0.9 | 1075 | 160 | 2.8 | 0.4 | 0.34 | 0.44
Pagwa River | 185 | -35 | -37 | 28 | 21 | 6500 | 20 | 86 | 540 | 0.8 | 825 | 80 | 2.7 | 0.4 | 0.22 | 0.3
Paris | 245 | -18 | -20 | 30 | 23 | 4000 | 23 | 96 | 790 | 0.9 | 925 | 160 | 1.4 | 0.4 | 0.33 | 0.42
Parkhill | 205 | -16 | -18 | 31 | 23 | 3800 | 25 | 103 | 800 | 0.9 | 925 | 180 | 2.1 | 0.4 | 0.37 | 0.48
Parry Sound | 215 | -24 | -26 | 28 | 22 | 4640 | 23 | 97 | 820 | 1.0 | 1050 | 160 | 2.8 | 0.4 | 0.3 | 0.39
Pelham (Fonthill) | 230 | -15 | -17 | 30 | 23 | 3690 | 23 | 96 | 820 | 0.9 | 950 | 160 | 2.1 | 0.4 | 0.33 | 0.42
Pembroke | 125 | -28 | -31 | 30 | 23 | 4980 | 23 | 105 | 640 | 0.8 | 825 | 100 | 2.5 | 0.4 | 0.27 | 0.35
Penetanguishene | 220 | -24 | -26 | 29 | 23 | 4200 | 25 | 97 | 720 | 0.9 | 1050 | 160 | 2.8 | 0.4 | 0.3 | 0.39
Perth | 130 | -25 | -27 | 30 | 23 | 4540 | 25 | 92 | 730 | 0.8 | 900 | 140 | 2.3 | 0.4 | 0.32 | 0.41
Petawawa | 135 | -29 | -31 | 30 | 23 | 4980 | 23 | 92 | 640 | 0.8 | 825 | 100 | 2.6 | 0.4 | 0.27 | 0.35
Peterborough | 200 | -23 | -25 | 30 | 23 | 4400 | 25 | 92 | 710 | 0.8 | 840 | 140 | 2.0 | 0.4 | 0.32 | 0.41
Petrolia | 195 | -16 | -18 | 31 | 24 | 3640 | 25 | 108 | 810 | 0.9 | 920 | 180 | 1.3 | 0.4 | 0.37 | 0.47
Pickering Zone 1 | 85 | -19 | -21 | 30 | 23 | 3800 | 23 | 92 | 730 | 0.9 | 825 | 140 | 1.0 | 0.4 | 0.37 | 0.48
Pickering Zone 2 | 175 | -20 | -22 | 30 | 23 | 3900 | 23 | 92 | 730 | 0.9 | 825 | 140 | 1.5 | 0.4 | 0.37 | 0.48
Pickering Zone 3 | 255 | -21 | -23 | 30 | 23 | 4010 | 23 | 86 | 770 | 0.91 | 850 | 140 | 1.9 | 0.4 | 0.35 | 0.45
Pickering Zone 4 | 315 | -22 | -24 | 30 | 23 | 4200 | 23 | 86 | 770 | 0.91 | 850 | 140 | 2.3 | 0.4 | 0.35 | 0.45
Picton | 95 | -21 | -23 | 29 | 23 | 3980 | 23 | 92 | 770 | 0.9 | 940 | 160 | 2.0 | 0.4 | 0.38 | 0.49
Plattsville | 300 | -19 | -21 | 29 | 23 | 4150 | 28 | 103 | 820 | 0.9 | 950 | 140 | 1.9 | 0.4 | 0.33 | 0.42
Point Alexander | 150 | -29 | -32 | 30 | 22 | 4960 | 23 | 92 | 650 | 0.8 | 850 | 100 | 2.5 | 0.4 | 0.27 | 0.35
Port Burwell | 195 | -15 | -17 | 30 | 24 | 3800 | 25 | 92 | 930 | 1.1 | 1000 | 180 | 1.2 | 0.4 | 0.37 | 0.47
Port Colborne | 180 | -15 | -17 | 30 | 24 | 3600 | 23 | 108 | 850 | 1.0 | 1000 | 160 | 2.1 | 0.4 | 0.36 | 0.46
Port Elgin | 205 | -17 | -19 | 28 | 22 | 4100 | 25 | 92 | 790 | 0.9 | 850 | 180 | 2.8 | 0.4 | 0.37 | 0.48
Port Hope | 100 | -21 | -23 | 29 | 23 | 3970 | 23 | 94 | 760 | 0.9 | 825 | 180 | 1.2 | 0.4 | 0.37 | 0.48
Port Perry | 270 | -22 | -24 | 30 | 23 | 4260 | 25 | 97 | 720 | 0.8 | 850 | 140 | 2.4 | 0.4 | 0.34 | 0.44
Port Stanley | 180 | -15 | -17 | 31 | 24 | 3850 | 25 | 92 | 940 | 1.1 | 975 | 180 | 1.2 | 0.4 | 0.37 | 0.47
Prescott | 90 | -23 | -25 | 29 | 23 | 4120 | 25 | 103 | 770 | 0.9 | 975 | 180 | 2.2 | 0.4 | 0.34 | 0.44
Princeton | 280 | -18 | -20 | 30 | 23 | 4000 | 25 | 97 | 810 | 0.9 | 925 | 160 | 1.5 | 0.4 | 0.33 | 0.42
Raith | 475 | -34 | -37 | 28 | 22 | 5900 | 23 | 97 | 570 | 0.8 | 750 | 120 | 2.7 | 0.4 | 0.22 | 0.3
Rayside-Balfour (Chelmsford) | 270 | -28 | -30 | 29 | 21 | 5200 | 25 | 92 | 650 | 0.8 | 850 | 180 | 2.5 | 0.4 | 0.35 | 0.45
Red Lake | 360 | -35 | -37 | 28 | 21 | 6220 | 20 | 92 | 470 | 0.7 | 630 | 120 | 2.6 | 0.3 | 0.22 | 0.3
Renfrew | 115 | -27 | -30 | 30 | 23 | 4900 | 23 | 97 | 620 | 0.8 | 810 | 140 | 2.5 | 0.4 | 0.27 | 0.35
Richmond Hill | 230 | -21 | -23 | 31 | 24 | 4000 | 25 | 97 | 740 | 0.8 | 850 | 140 | 1.5 | 0.4 | 0.34 | 0.44
Rockland | 50 | -26 | -28 | 30 | 23 | 4600 | 23 | 92 | 780 | 0.9 | 950 | 160 | 2.4 | 0.4 | 0.31 | 0.4
Sarnia | 190 | -16 | -18 | 31 | 24 | 3750 | 25 | 100 | 750 | 0.9 | 825 | 180 | 1.1 | 0.4 | 0.37 | 0.47
Sault Ste. Marie | 190 | -25 | -28 | 29 | 22 | 4960 | 23 | 97 | 660 | 0.9 | 950 | 200 | 3.1 | 0.4 | 0.33 | 0.44
Schreiber | 310 | -34 | -36 | 27 | 21 | 5960 | 20 | 103 | 600 | 0.8 | 850 | 160 | 3.3 | 0.4 | 0.29 | 0.39
Seaforth | 310 | -17 | -19 | 30 | 23 | 4100 | 25 | 108 | 810 | 0.9 | 1025 | 160 | 2.5 | 0.4 | 0.35 | 0.45
Shelburne | 495 | -22 | -24 | 29 | 23 | 4700 | 28 | 108 | 740 | 0.9 | 900 | 150 | 3.1 | 0.4 | 0.31 | 0.4
Simcoe | 210 | -17 | -19 | 30 | 24 | 3700 | 28 | 113 | 860 | 1.0 | 950 | 160 | 1.3 | 0.4 | 0.35 | 0.45
Sioux Lookout | 375 | -34 | -36 | 28 | 22 | 5950 | 25 | 97 | 520 | 0.7 | 710 | 100 | 2.6 | 0.3 | 0.22 | 0.3
Smiths Falls | 130 | -25 | -27 | 30 | 23 | 4540 | 25 | 92 | 730 | 0.8 | 850 | 140 | 2.3 | 0.4 | 0.32 | 0.41
Smithville | 185 | -16 | -18 | 30 | 23 | 3650 | 23 | 108 | 800 | 0.9 | 900 | 160 | 1.5 | 0.4 | 0.33 | 0.42
Smooth Rock Falls | 235 | -34 | -36 | 29 | 21 | 6250 | 20 | 92 | 560 | 0.8 | 850 | 80 | 2.7 | 0.3 | 0.25 | 0.32
Southampton | 180 | -17 | -19 | 28 | 22 | 4100 | 25 | 92 | 800 | 1.0 | 830 | 180 | 2.7 | 0.4 | 0.37 | 0.48
South River | 355 | -27 | -29 | 29 | 22 | 5090 | 25 | 103 | 830 | 1.0 | 975 | 120 | 2.8 | 0.4 | 0.27 | 0.35
St. Catharines | 105 | -16 | -18 | 30 | 23 | 3540 | 23 | 92 | 770 | 0.9 | 850 | 160 | 1.0 | 0.4 | 0.36 | 0.46
St. Mary's | 310 | -18 | -20 | 30 | 23 | 4000 | 28 | 108 | 820 | 1.0 | 1025 | 160 | 2.2 | 0.4 | 0.37 | 0.47
St. Thomas | 225 | -16 | -18 | 31 | 24 | 3780 | 25 | 103 | 900 | 1.0 | 975 | 180 | 1.4 | 0.4 | 0.37 | 0.47
Stirling | 120 | -23 | -25 | 30 | 23 | 4220 | 25 | 97 | 740 | 0.9 | 850 | 120 | 1.7 | 0.4 | 0.31 | 0.4
Stratford | 360 | -18 | -20 | 29 | 23 | 4050 | 28 | 113 | 820 | 1.0 | 1050 | 160 | 2.3 | 0.4 | 0.35 | 0.45
Strathroy | 225 | -17 | -19 | 31 | 24 | 3780 | 25 | 103 | 770 | 0.9 | 950 | 180 | 1.9 | 0.4 | 0.37 | 0.47
Sturgeon Falls | 205 | -28 | -30 | 29 | 21 | 5200 | 25 | 95 | 700 | 0.9 | 910 | 140 | 2.4 | 0.4 | 0.27 | 0.35
Sudbury | 275 | -28 | -30 | 29 | 21 | 5180 | 25 | 97 | 650 | 0.8 | 875 | 200 | 2.5 | 0.4 | 0.36 | 0.46
Sundridge | 340 | -27 | -29 | 29 | 22 | 5080 | 25 | 97 | 840 | 1.0 | 975 | 120 | 2.8 | 0.4 | 0.27 | 0.35
Tavistock | 340 | -19 | -21 | 29 | 23 | 4100 | 28 | 113 | 820 | 1.0 | 1010 | 160 | 2.1 | 0.4 | 0.35 | 0.45
Temagami | 300 | -30 | -33 | 30 | 22 | 5420 | 23 | 92 | 650 | 0.8 | 875 | 120 | 2.6 | 0.4 | 0.29 | 0.37
Thamesford | 280 | -19 | -21 | 30 | 23 | 3950 | 28 | 108 | 820 | 0.9 | 975 | 160 | 1.9 | 0.4 | 0.37 | 0.48
Thedford | 205 | -16 | -18 | 31 | 23 | 3710 | 25 | 103 | 810 | 1.0 | 900 | 180 | 2.1 | 0.4 | 0.37 | 0.48
Thunder Bay | 210 | -31 | -33 | 29 | 21 | 5650 | 23 | 108 | 560 | 0.8 | 710 | 160 | 2.9 | 0.4 | 0.29 | 0.39
Tillsonburg | 215 | -17 | -19 | 30 | 24 | 3840 | 25 | 103 | 880 | 1.0 | 980 | 160 | 1.3 | 0.4 | 0.34 | 0.44
Timmins | 300 | -34 | -36 | 29 | 21 | 5940 | 20 | 108 | 560 | 0.8 | 875 | 100 | 3.1 | 0.3 | 0.27 | 0.35
Timmins (Porcupine) | 295 | -34 | -36 | 29 | 21 | 6000 | 20 | 103 | 560 | 0.8 | 875 | 100 | 2.9 | 0.3 | 0.29 | 0.37
Toronto Metropolitan Region β Etobicoke | 160 | -20 | -22 | 31 | 24 | 3800 | 26 | 108 | 720 | 0.8 | 800 | 160 | 1.1 | 0.4 | 0.34 | 0.44
Toronto Metropolitan Region β North York | 175 | -20 | -22 | 31 | 24 | 3760 | 25 | 108 | 730 | 0.8 | 850 | 150 | 1.2 | 0.4 | 0.34 | 0.44
Toronto Metropolitan Region β Scarborough | 180 | -20 | -22 | 31 | 24 | 3800 | 25 | 92 | 730 | 0.9 | 825 | 160 | 1.2 | 0.4 | 0.37 | 0.47
Toronto Metropolitan Region β Toronto (City Hall) | 90 | -18 | -20 | 31 | 23 | 3520 | 25 | 97 | 720 | 0.9 | 820 | 160 | 0.9 | 0.4 | 0.34 | 0.44
Trenton | 80 | -22 | -24 | 29 | 23 | 4110 | 23 | 97 | 760 | 0.9 | 850 | 160 | 1.6 | 0.4 | 0.37 | 0.47
Trout Creek | 330 | -27 | -29 | 29 | 22 | 5100 | 25 | 103 | 780 | 0.9 | 975 | 120 | 2.7 | 0.4 | 0.27 | 0.35
Uxbridge | 275 | -22 | -24 | 30 | 23 | 4240 | 25 | 103 | 700 | 0.8 | 850 | 140 | 2.4 | 0.4 | 0.33 | 0.42
Vaughan (Woodbridge) | 165 | -20 | -22 | 31 | 24 | 4100 | 26 | 113 | 700 | 0.8 | 800 | 140 | 1.1 | 0.4 | 0.34 | 0.44
Vittoria | 215 | -15 | -17 | 30 | 24 | 3680 | 25 | 113 | 880 | 1.0 | 950 | 160 | 1.3 | 0.4 | 0.37 | 0.47
Walkerton | 275 | -18 | -20 | 30 | 22 | 4300 | 28 | 103 | 790 | 0.9 | 1025 | 160 | 2.7 | 0.4 | 0.36 | 0.46
Wallaceburg | 180 | -16 | -18 | 31 | 24 | 3600 | 28 | 97 | 760 | 0.9 | 825 | 180 | 0.9 | 0.4 | 0.35 | 0.45
Waterloo | 330 | -19 | -21 | 29 | 23 | 4200 | 28 | 119 | 780 | 0.9 | 925 | 160 | 2.0 | 0.4 | 0.29 | 0.37
Watford | 240 | -17 | -19 | 31 | 24 | 3740 | 25 | 108 | 790 | 0.9 | 950 | 160 | 1.9 | 0.4 | 0.37 | 0.47
Wawa | 290 | -34 | -36 | 26 | 21 | 5840 | 20 | 93 | 725 | 0.9 | 950 | 160 | 3.4 | 0.4 | 0.3 | 0.39
Welland | 180 | -15 | -17 | 30 | 23 | 3670 | 23 | 103 | 840 | 1.0 | 975 | 160 | 2.0 | 0.4 | 0.34 | 0.43
West Lorne | 215 | -16 | -18 | 31 | 24 | 3700 | 28 | 103 | 840 | 1.0 | 900 | 180 | 1.3 | 0.4 | 0.37 | 0.47
Whitby | 85 | -20 | -22 | 30 | 23 | 3820 | 23 | 86 | 760 | 0.9 | 850 | 160 | 1.2 | 0.4 | 0.37 | 0.48
Whitby (Brooklin) | 160 | -20 | -22 | 30 | 23 | 4010 | 23 | 86 | 770 | 0.9 | 850 | 140 | 1.9 | 0.4 | 0.35 | 0.45
White River | 375 | -39 | -42 | 28 | 21 | 6150 | 20 | 92 | 575 | 0.8 | 825 | 100 | 3.6 | 0.4 | 0.22 | 0.3
Wiarton | 185 | -19 | -21 | 29 | 22 | 4300 | 25 | 103 | 740 | 0.9 | 1000 | 180 | 2.7 | 0.4 | 0.34 | 0.44
Windsor | 185 | -16 | -18 | 32 | 24 | 3400 | 28 | 103 | 800 | 0.9 | 900 | 180 | 0.8 | 0.4 | 0.37 | 0.47
Wingham | 310 | -18 | -20 | 30 | 23 | 4220 | 28 | 108 | 780 | 0.9 | 1050 | 160 | 2.6 | 0.4 | 0.36 | 0.46
Woodstock | 300 | -19 | -21 | 30 | 23 | 3910 | 28 | 113 | 830 | 0.9 | 930 | 160 | 1.9 | 0.4 | 0.34 | 0.44
Wyoming | 215 | -16 | -18 | 31 | 24 | 3700 | 25 | 103 | 815 | 0.9 | 900 | 180 | 1.6 | 0.4 | 0.37 | 0.47
OBC Div. B Table 9.23.4.2-H. Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 184 mm Members
Open OBC Div. B Table 9.23.4.2-H. in the code viewerTable 9.23.4.2.-H β Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 184 mm Members Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(3), 9.23.4.4.(3) and 9.23.8.1.(1) Commercial Designation | Grade | Supported Length, m | Size of Beam: 3 β 38 Γ 184 mm | Size of Beam: 4 β 38 Γ 184 mm | Size of Beam: 5 β 38 Γ 184 mm Douglas Fir β Larch[7] | Select Structural | 2.40 m | 3.36 m | 3.70 m | 3.99 m Douglas Fir β Larch[7] | Select Structural | 3.00 m | 3.12 m | 3.44 m | 3.70 m Douglas Fir β Larch[7] | Select Structural | 3.60 m | 2.94 m | 3.23 m | 3.48 m Douglas Fir β Larch[7] | Select Structural | 4.20 m | 2.79 m | 3.07 m | 3.31 m Douglas Fir β Larch[7] | Select Structural | 4.80 m | 2.67 m | 2.94 m | 3.17 m Douglas Fir β Larch[7] | Select Structural | 5.40 m | 2.54 m | 2.83 m | 3.04 m Douglas Fir β Larch[7] | Select Structural | 6.00 m | 2.41 m | 2.73 m | 2.94 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 2.40 m | 2.97 m | 3.42 m | 3.82 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 3.00 m | 2.65 m | 3.06 m | 3.42 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 3.60 m | 2.42 m | 2.80 m | 3.13 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 4.20 m | 2.24 m | 2.59 m | 2.89 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 4.80 m | 2.10 m | 2.42 m | 2.71 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 5.40 m | 1.98 m | 2.28 m | 2.55 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 6.00 m | 1.88 m | 2.17 m | 2.42 m Hem β Fir[8] | Select Structural | 2.40 m | 3.32 m | 3.65 m | 3.93 m Hem β Fir[8] | Select Structural | 3.00 m | 3.08 m | 3.39 m | 3.65 m Hem β Fir[8] | Select Structural | 3.60 m | 2.90 m | 3.19 m | 3.44 m Hem β Fir[8] | Select Structural | 4.20 m | 2.75 m | 3.03 m | 3.27 m Hem β Fir[8] | Select Structural | 4.80 m | 2.63 m | 2.90 m | 3.12 m Hem β Fir[8] | Select Structural | 5.40 m | 2.49 m | 2.79 m | 3.00 m Hem β Fir[8] | Select Structural | 6.00 m | 2.28 m | 2.69 m | 2.90 m Hem β Fir[8] | No. 1 and No. 2 | 2.40 m | 3.11 m | 3.55 m | 3.82 m Hem β Fir[8] | No. 1 and No. 2 | 3.00 m | 2.78 m | 3.21 m | 3.55 m Hem β Fir[8] | No. 1 and No. 2 | 3.60 m | 2.54 m | 2.93 m | 3.28 m Hem β Fir[8] | No. 1 and No. 2 | 4.20 m | 2.35 m | 2.72 m | 3.04 m Hem β Fir[8] | No. 1 and No. 2 | 4.80 m | 2.20 m | 2.54 m | 2.84 m Hem β Fir[8] | No. 1 and No. 2 | 5.40 m | 2.07 m | 2.39 m | 2.68 m Hem β Fir[8] | No. 1 and No. 2 | 6.00 m | 1.97 m | 2.27 m | 2.54 m Spruce β Pine β Fir[9] | Select Structural | 2.40 m | 3.17 m | 3.49 m | 3.76 m Spruce β Pine β Fir[9] | Select Structural | 3.00 m | 2.95 m | 3.24 m | 3.49 m Spruce β Pine β Fir[9] | Select Structural | 3.60 m | 2.77 m | 3.05 m | 3.29 m Spruce β Pine β Fir[9] | Select Structural | 4.20 m | 2.63 m | 2.90 m | 3.12 m Spruce β Pine β Fir[9] | Select Structural | 4.80 m | 2.52 m | 2.77 m | 2.99 m Spruce β Pine β Fir[9] | Select Structural | 5.40 m | 2.42 m | 2.67 m | 2.87 m Spruce β Pine β Fir[9] | Select Structural | 6.00 m | 2.34 m | 2.57 m | 2.77 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 2.40 m | 3.07 m | 3.38 m | 3.64 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 3.00 m | 2.85 m | 3.14 m | 3.38 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 3.60 m | 2.63 m | 2.95 m | 3.18 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 4.20 m | 2.44 m | 2.80 m | 3.02 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 4.80 m | 2.28 m | 2.63 m | 2.89 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 5.40 m | 2.15 m | 2.48 m | 2.77 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 6.00 m | 2.04 m | 2.35 m | 2.63 m Northern Species[10] | Select Structural | 2.40 m | 2.84 m | 3.12 m | 3.36 m Northern Species[10] | Select Structural | 3.00 m | 2.63 m | 2.90 m | 3.12 m Northern Species[10] | Select Structural | 3.60 m | 2.48 m | 2.73 m | 2.94 m Northern Species[10] | Select Structural | 4.20 m | 2.31 m | 2.59 m | 2.79 m Northern Species[10] | Select Structural | 4.80 m | 2.16 m | 2.48 m | 2.67 m Northern Species[10] | Select Structural | 5.40 m | 2.04 m | 2.35 m | 2.57 m Northern Species[10] | Select Structural | 6.00 m | 1.93 m | 2.23 m | 2.48 m Northern Species[10] | No. 1 and No. 2 | 2.40 m | 2.59 m | 2.99 m | 3.29 m Northern Species[10] | No. 1 and No. 2 | 3.00 m | 2.31 m | 2.67 m | 2.99 m Northern Species[10] | No. 1 and No. 2 | 3.60 m | 2.11 m | 2.44 m | 2.73 m Northern Species[10] | No. 1 and No. 2 | 4.20 m | 1.95 m | 2.26 m | 2.52 m Northern Species[10] | No. 1 and No. 2 | 4.80 m | 1.83 m | 2.11 m | 2.36 m Northern Species[10] | No. 1 and No. 2 | 5.40 m | 1.72 m | 1.99 m | 2.23 m Northern Species[10] | No. 1 and No. 2 | 6.00 m | 1.64 m | 1.89 m | 2.11 m Table 9.23.4.2.-H (continued) β Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 235 mm Members Commercial Designation | Grade | Supported Length, m | Size of Beam: 3 β 38 Γ 235 mm | Size of Beam: 4 β 38 Γ 235 mm | Size of Beam: 5 β 38 Γ 235 mm Douglas Fir β Larch[7] | Select Structural | 2.40 m | 4.30 m | 4.73 m | 5.09 m Douglas Fir β Larch[7] | Select Structural | 3.00 m | 3.99 m | 4.39 m | 4.73 m Douglas Fir β Larch[7] | Select Structural | 3.60 m | 3.75 m | 4.13 m | 4.45 m Douglas Fir β Larch[7] | Select Structural | 4.20 m | 3.52 m | 3.92 m | 4.23 m Douglas Fir β Larch[7] | Select Structural | 4.80 m | 3.29 m | 3.75 m | 4.04 m Douglas Fir β Larch[7] | Select Structural | 5.40 m | 3.11 m | 3.59 m | 3.89 m Douglas Fir β Larch[7] | Select Structural | 6.00 m | 2.95 m | 3.40 m | 3.75 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 2.40 m | 3.63 m | 4.19 m | 4.68 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 3.00 m | 3.24 m | 3.75 m | 4.19 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 3.60 m | 2.96 m | 3.42 m | 3.82 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 4.20 m | 2.74 m | 3.17 m | 3.54 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 4.80 m | 2.56 m | 2.96 m | 3.31 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 5.40 m | 2.42 m | 2.79 m | 3.12 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 6.00 m | 2.29 m | 2.65 m | 2.96 m Hem β Fir[8] | Select Structural | 2.40 m | 4.24 m | 4.66 m | 5.03 m Hem β Fir[8] | Select Structural | 3.00 m | 3.93 m | 4.33 m | 4.66 m Hem β Fir[8] | Select Structural | 3.60 m | 3.70 m | 4.08 m | 4.39 m Hem β Fir[8] | Select Structural | 4.20 m | 3.47 m | 3.87 m | 4.17 m Hem β Fir[8] | Select Structural | 4.80 m | 3.24 m | 3.70 m | 3.99 m Hem β Fir[8] | Select Structural | 5.40 m | 2.95 m | 3.53 m | 3.83 m Hem β Fir[8] | Select Structural | 6.00 m | 2.70 m | 3.35 m | 3.70 m Hem β Fir[8] | No. 1 and No. 2 | 2.40 m | 3.80 m | 4.39 m | 4.88 m Hem β Fir[8] | No. 1 and No. 2 | 3.00 m | 3.40 m | 3.93 m | 4.39 m Hem β Fir[8] | No. 1 and No. 2 | 3.60 m | 3.11 m | 3.59 m | 4.01 m Hem β Fir[8] | No. 1 and No. 2 | 4.20 m | 2.88 m | 3.32 m | 3.71 m Hem β Fir[8] | No. 1 and No. 2 | 4.80 m | 2.69 m | 3.11 m | 3.47 m Hem β Fir[8] | No. 1 and No. 2 | 5.40 m | 2.54 m | 2.93 m | 3.27 m Hem β Fir[8] | No. 1 and No. 2 | 6.00 m | 2.41 m | 2.78 m | 3.11 m Spruce β Pine β Fir[9] | Select Structural | 2.40 m | 4.05 m | 4.46 m | 4.81 m Spruce β Pine β Fir[9] | Select Structural | 3.00 m | 3.76 m | 4.14 m | 4.46 m Spruce β Pine β Fir[9] | Select Structural | 3.60 m | 3.54 m | 3.90 m | 4.20 m Spruce β Pine β Fir[9] | Select Structural | 4.20 m | 3.36 m | 3.70 m | 3.99 m Spruce β Pine β Fir[9] | Select Structural | 4.80 m | 3.22 m | 3.54 m | 3.81 m Spruce β Pine β Fir[9] | Select Structural | 5.40 m | 3.09 m | 3.41 m | 3.67 m Spruce β Pine β Fir[9] | Select Structural | 6.00 m | 2.95 m | 3.29 m | 3.54 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 2.40 m | 3.92 m | 4.32 m | 4.65 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 3.00 m | 3.52 m | 4.01 m | 4.32 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 3.60 m | 3.22 m | 3.71 m | 4.06 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 4.20 m | 2.98 m | 3.44 m | 3.84 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 4.80 m | 2.79 m | 3.22 m | 3.60 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 5.40 m | 2.63 m | 3.03 m | 3.39 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 6.00 m | 2.49 m | 2.88 m | 3.22 m Northern Species[10] | Select Structural | 2.40 m | 3.62 m | 3.99 m | 4.30 m Northern Species[10] | Select Structural | 3.00 m | 3.34 m | 3.70 m | 3.99 m Northern Species[10] | Select Structural | 3.60 m | 3.05 m | 3.48 m | 3.75 m Northern Species[10] | Select Structural | 4.20 m | 2.82 m | 3.26 m | 3.57 m Northern Species[10] | Select Structural | 4.80 m | 2.64 m | 3.05 m | 3.41 m Northern Species[10] | Select Structural | 5.40 m | 2.49 m | 2.87 m | 3.21 m Northern Species[10] | Select Structural | 6.00 m | 2.36 m | 2.73 m | 3.05 m Northern Species[10] | No. 1 and No. 2 | 2.40 m | 3.16 m | 3.65 m | 4.08 m Northern Species[10] | No. 1 and No. 2 | 3.00 m | 2.83 m | 3.27 m | 3.65 m Northern Species[10] | No. 1 and No. 2 | 3.60 m | 2.58 m | 2.98 m | 3.33 m Northern Species[10] | No. 1 and No. 2 | 4.20 m | 2.39 m | 2.76 m | 3.09 m Northern Species[10] | No. 1 and No. 2 | 4.80 m | 2.24 m | 2.58 m | 2.89 m Northern Species[10] | No. 1 and No. 2 | 5.40 m | 2.11 m | 2.43 m | 2.72 m Northern Species[10] | No. 1 and No. 2 | 6.00 m | 2.00 m | 2.31 m | 2.58 m Table 9.23.4.2.-H (continued) β Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor β 38 Γ 286 mm Members Commercial Designation | Grade | Supported Length, m | Size of Beam: 3 β 38 Γ 286 mm | Size of Beam: 4 β 38 Γ 286 mm | Size of Beam: 5 β 38 Γ 286 mm Douglas Fir β Larch[7] | Select Structural | 2.40 m | 5.23 m | 5.66 m | 5.99 m Douglas Fir β Larch[7] | Select Structural | 3.00 m | 4.84 m | 5.34 m | 5.66 m Douglas Fir β Larch[7] | Select Structural | 3.60 m | 4.41 m | 5.03 m | 5.41 m Douglas Fir β Larch[7] | Select Structural | 4.20 m | 4.09 m | 4.72 m | 5.14 m Douglas Fir β Larch[7] | Select Structural | 4.80 m | 3.82 m | 4.41 m | 4.92 m Douglas Fir β Larch[7] | Select Structural | 5.40 m | 3.60 m | 4.16 m | 4.65 m Douglas Fir β Larch[7] | Select Structural | 6.00 m | 3.42 m | 3.95 m | 4.41 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 2.40 m | 4.21 m | 4.86 m | 5.43 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 3.00 m | 3.76 m | 4.35 m | 4.86 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 3.60 m | 3.44 m | 3.97 m | 4.44 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 4.20 m | 3.18 m | 3.67 m | 4.11 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 4.80 m | 2.98 m | 3.44 m | 3.84 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 5.40 m | 2.81 m | 3.24 m | 3.62 m Douglas Fir β Larch[7] | No. 1 and No. 2 | 6.00 m | 2.66 m | 3.07 m | 3.44 m Hem β Fir[8] | Select Structural | 2.40 m | 5.16 m | 5.61 m | 5.93 m Hem β Fir[8] | Select Structural | 3.00 m | 4.76 m | 5.27 m | 5.61 m Hem β Fir[8] | Select Structural | 3.60 m | 4.35 m | 4.96 m | 5.34 m Hem β Fir[8] | Select Structural | 4.20 m | 4.02 m | 4.65 m | 5.07 m Hem β Fir[8] | Select Structural | 4.80 m | 3.66 m | 4.35 m | 4.85 m Hem β Fir[8] | Select Structural | 5.40 m | 3.32 m | 4.10 m | 4.58 m Hem β Fir[8] | Select Structural | 6.00 m | 3.04 m | 3.87 m | 4.35 m Hem β Fir[8] | No. 1 and No. 2 | 2.40 m | 4.41 m | 5.10 m | 5.70 m Hem β Fir[8] | No. 1 and No. 2 | 3.00 m | 3.95 m | 4.56 m | 5.10 m Hem β Fir[8] | No. 1 and No. 2 | 3.60 m | 3.60 m | 4.16 m | 4.65 m Hem β Fir[8] | No. 1 and No. 2 | 4.20 m | 3.34 m | 3.85 m | 4.31 m Hem β Fir[8] | No. 1 and No. 2 | 4.80 m | 3.12 m | 3.60 m | 4.03 m Hem β Fir[8] | No. 1 and No. 2 | 5.40 m | 2.94 m | 3.40 m | 3.80 m Hem β Fir[8] | No. 1 and No. 2 | 6.00 m | 2.79 m | 3.22 m | 3.60 m Spruce β Pine β Fir[9] | Select Structural | 2.40 m | 4.93 m | 5.42 m | 5.73 m Spruce β Pine β Fir[9] | Select Structural | 3.00 m | 4.58 m | 5.04 m | 5.42 m Spruce β Pine β Fir[9] | Select Structural | 3.60 m | 4.31 m | 4.74 m | 5.11 m Spruce β Pine β Fir[9] | Select Structural | 4.20 m | 4.09 m | 4.51 m | 4.85 m Spruce β Pine β Fir[9] | Select Structural | 4.80 m | 3.82 m | 4.31 m | 4.64 m Spruce β Pine β Fir[9] | Select Structural | 5.40 m | 3.60 m | 4.14 m | 4.46 m Spruce β Pine β Fir[9] | Select Structural | 6.00 m | 3.32 m | 3.95 m | 4.31 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 2.40 m | 4.57 m | 5.25 m | 5.59 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 3.00 m | 4.09 m | 4.72 m | 5.25 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 3.60 m | 3.73 m | 4.31 m | 4.82 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 4.20 m | 3.46 m | 3.99 m | 4.46 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 4.80 m | 3.23 m | 3.73 m | 4.17 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 5.40 m | 3.05 m | 3.52 m | 3.93 m Spruce β Pine β Fir[9] | No. 1 and No. 2 | 6.00 m | 2.89 m | 3.34 m | 3.73 m Northern Species[10] | Select Structural | 2.40 m | 4.33 m | 4.85 m | 5.23 m Northern Species[10] | Select Structural | 3.00 m | 3.88 m | 4.47 m | 4.85 m Northern Species[10] | Select Structural | 3.60 m | 3.54 m | 4.08 m | 4.57 m Northern Species[10] | Select Structural | 4.20 m | 3.28 m | 3.78 m | 4.23 m Northern Species[10] | Select Structural | 4.80 m | 3.06 m | 3.54 m | 3.96 m Northern Species[10] | Select Structural | 5.40 m | 2.89 m | 3.34 m | 3.73 m Northern Species[10] | Select Structural | 6.00 m | 2.74 m | 3.16 m | 3.54 m Northern Species[10] | No. 1 and No. 2 | 2.40 m | 3.67 m | 4.24 m | 4.74 m Northern Species[10] | No. 1 and No. 2 | 3.00 m | 3.28 m | 3.79 m | 4.24 m Northern Species[10] | No. 1 and No. 2 | 3.60 m | 3.00 m | 3.46 m | 3.87 m Northern Species[10] | No. 1 and No. 2 | 4.20 m | 2.77 m | 3.20 m | 3.58 m Northern Species[10] | No. 1 and No. 2 | 4.80 m | 2.59 m | 3.00 m | 3.35 m Northern Species[10] | No. 1 and No. 2 | 5.40 m | 2.45 m | 2.82 m | 3.16 m Northern Species[10] | No. 1 and No. 2 | 6.00 m | 2.32 m | 2.68 m | 3.00 m Notes to Table 9.23.4.2.-H: (1) Beam spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floors does not exceed that specified for residential areas as described in Table 4.1.5.3. (2) When the floors have a concrete topping of not more than 51 mm, the spans must be multiplied by 0.8. (3) Supported length means half the sum of the joists spans on both sides of the beam. (4) Straight interpolation may be used for other supported lengths. (5) Spans are clear spans between supports. For total span, add two bearing lengths. (6) 3-ply beams with supported lengths greater than 4.2 m require minimum bearing length of 114 mm. All other beams require minimum bearing length of 76 mm. (7) Includes Douglas Fir and Western Larch. (8) Includes Western Hemlock and Amabilis Fir. (9) Includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir. (10) Includes any Canadian Species covered by the NLGA Standard Grading Rules.
OBC Div. B 9.23.4.4. Concrete Topping
Open OBC Div. B 9.23.4.4. in the code viewer(1)Except as permitted in Sentence (2), where a floor is required to support a concrete topping, the joist spans shown Span Table 9.23.4.2.-A or the spacing of the members shall be reduced to allow for the loads due to the topping.
(2)Where a floor is required to support a concrete topping, joist spans are permitted to be selected from Span Table 9.23.4.2.-B provided the concrete
(a)is 38 to 51 mm thick,
(b)is normal weight,
(c)is placed directly on the subflooring, and
(d)has not less than 20 MPa compressive strength after 28 days.
(3)Where a floor is required to support a concrete topping not more than 51 mm thick, the allowable beam spans shown in Span Tables 9.23.4.2.-H to 9.23.4.2.-K shall be multiplied by 0.8 or the supported length of the floor joists shall be reduced to allow for the loads due to the topping.
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OBC Div. B Table 9.23.12.3-C. Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 1.0 kPa
Open OBC Div. B Table 9.23.12.3-C. in the code viewerTable 9.23.12.3.-C β Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 1.0 kPa Forming Part of Sentences 9.23.2.8.(1), 9.23.4.5.(1), 9.23.12.3.(1) and (3) Lintel Supporting | Lintel Size, mm | Exterior Walls, m | Interior Walls, m Limited attic storage and ceiling | 2 β 38 Γ 89 | N/A | 1.27 Limited attic storage and ceiling | 2 β 38 Γ 140 | N/A | 1.93 Limited attic storage and ceiling | 2 β 38 Γ 184 | N/A | 2.35 Limited attic storage and ceiling | 2 β 38 Γ 235 | N/A | 2.88 Limited attic storage and ceiling | 2 β 38 Γ 286 | N/A | 3.34 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 89 | 2.55 | 1.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 140 | 4.01 | 2.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 184 | 5.27 | 3.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 235 | 6.37 | 4.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 286 | 7.38 | 5.87 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 89 | 1.27 | 0.93 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 140 | 1.93 | 1.35 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 184 | 2.35 | 1.64 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 235 | 2.88 | 2.01 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 286 | 3.34 | 2.33 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 89 | 1.05 | 0.74 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 140 | 1.49 | 1.02 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 184 | 1.82 | 1.20 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 235 | 2.22 | 1.45 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 286 | 2.58 | 1.66 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 89 | 0.94 | 0.64 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 140 | 1.34 | 0.88 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 184 | 1.63 | 1.05 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 235 | 1.99 | 1.27 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 286 | 2.31 | 1.45 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 89 | 0.88 | 0.59 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 140 | 1.25 | 0.81 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 184 | 1.52 | 0.97 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 235 | 1.86 | 1.17 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 286 | 2.11 | 1.35 Table 9.23.12.3.-C (continued) β Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 1.5 kPa Lintel Supporting | Lintel Size, mm | Exterior Walls, m | Interior Walls, m Limited attic storage and ceiling | 2 β 38 Γ 89 | N/A | 1.27 Limited attic storage and ceiling | 2 β 38 Γ 140 | N/A | 1.93 Limited attic storage and ceiling | 2 β 38 Γ 184 | N/A | 2.35 Limited attic storage and ceiling | 2 β 38 Γ 235 | N/A | 2.88 Limited attic storage and ceiling | 2 β 38 Γ 286 | N/A | 3.34 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 89 | 2.23 | 1.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 140 | 3.50 | 2.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 184 | 4.61 | 3.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 235 | 5.76 | 4.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 286 | 6.67 | 5.87 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 89 | 1.11 | 0.93 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 140 | 1.66 | 1.35 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 184 | 2.02 | 1.64 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 235 | 2.47 | 2.01 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 286 | 2.87 | 2.33 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 89 | 0.96 | 0.74 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 140 | 1.37 | 1.02 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 184 | 1.67 | 1.20 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 235 | 2.04 | 1.45 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 286 | 2.36 | 1.66 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 89 | 0.88 | 0.64 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 140 | 1.26 | 0.88 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 184 | 1.53 | 1.05 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 235 | 1.87 | 1.27 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 286 | 2.12 | 1.45 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 89 | 0.83 | 0.59 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 140 | 1.19 | 0.81 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 184 | 1.44 | 0.97 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 235 | 1.73 | 1.17 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 286 | 1.96 | 1.35 Table 9.23.12.3.-C (continued) β Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 2.0 kPa Lintel Supporting | Lintel Size, mm | Exterior Walls, m | Interior Walls, m Limited attic storage and ceiling | 2 β 38 Γ 89 | N/A | 1.27 Limited attic storage and ceiling | 2 β 38 Γ 140 | N/A | 1.93 Limited attic storage and ceiling | 2 β 38 Γ 184 | N/A | 2.35 Limited attic storage and ceiling | 2 β 38 Γ 235 | N/A | 2.88 Limited attic storage and ceiling | 2 β 38 Γ 286 | N/A | 3.34 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 89 | 2.02 | 1.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 140 | 3.18 | 2.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 184 | 4.18 | 3.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 235 | 5.34 | 4.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 286 | 6.21 | 5.87 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 89 | 1.01 | 0.93 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 140 | 1.48 | 1.35 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 184 | 1.80 | 1.64 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 235 | 2.20 | 2.01 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 286 | 2.56 | 2.33 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 89 | 0.89 | 0.74 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 140 | 1.27 | 1.02 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 184 | 1.55 | 1.20 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 235 | 1.89 | 1.45 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 286 | 2.15 | 1.66 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 89 | 0.83 | 0.64 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 140 | 1.19 | 0.88 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 184 | 1.44 | 1.05 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 235 | 1.72 | 1.27 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 286 | 1.96 | 1.45 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 89 | 0.80 | 0.59 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 140 | 1.14 | 0.81 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 184 | 1.35 | 0.97 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 235 | 1.62 | 1.17 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 286 | 1.84 | 1.35 Table 9.23.12.3.-C (continued) β Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 2.5 kPa Lintel Supporting | Lintel Size, mm | Exterior Walls, m | Interior Walls, m Limited attic storage and ceiling | 2 β 38 Γ 89 | N/A | 1.27 Limited attic storage and ceiling | 2 β 38 Γ 140 | N/A | 1.93 Limited attic storage and ceiling | 2 β 38 Γ 184 | N/A | 2.35 Limited attic storage and ceiling | 2 β 38 Γ 235 | N/A | 2.88 Limited attic storage and ceiling | 2 β 38 Γ 286 | N/A | 3.34 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 89 | 1.88 | 1.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 140 | 2.96 | 2.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 184 | 3.88 | 3.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 235 | 4.96 | 4.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 286 | 5.87 | 5.87 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 89 | 0.93 | 0.93 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 140 | 1.35 | 1.35 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 184 | 1.64 | 1.64 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 235 | 2.01 | 2.01 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 286 | 2.33 | 2.33 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 89 | 0.84 | 0.74 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 140 | 1.19 | 1.02 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 184 | 1.44 | 1.20 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 235 | 1.73 | 1.45 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 286 | 1.96 | 1.66 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 89 | 0.79 | 0.64 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 140 | 1.13 | 0.88 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 184 | 1.33 | 1.05 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 235 | 1.60 | 1.27 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 286 | 1.82 | 1.45 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 89 | 0.77 | 0.59 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 140 | 1.08 | 0.81 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 184 | 1.27 | 0.97 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 235 | 1.53 | 1.17 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 286 | 1.74 | 1.35 Table 9.23.12.3.-C (continued) β Maximum Spans for Spruce β Pine β Fir Lintels β No. 1 or No. 2 Grade β Non-Structural Sheathing β Specified Snow Load 3.0 kPa Lintel Supporting | Lintel Size, mm | Exterior Walls, m | Interior Walls, m Limited attic storage and ceiling | 2 β 38 Γ 89 | N/A | 1.27 Limited attic storage and ceiling | 2 β 38 Γ 140 | N/A | 1.93 Limited attic storage and ceiling | 2 β 38 Γ 184 | N/A | 2.35 Limited attic storage and ceiling | 2 β 38 Γ 235 | N/A | 2.88 Limited attic storage and ceiling | 2 β 38 Γ 286 | N/A | 3.34 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 89 | 1.77 | 1.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 140 | 2.78 | 2.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 184 | 3.66 | 3.88 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 235 | 4.67 | 4.96 Roof and ceiling only (tributary width of 0.6 m maximum)[5] | 2 β 38 Γ 286 | 5.61 | 5.87 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 89 | 0.87 | 0.93 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 140 | 1.25 | 1.35 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 184 | 1.52 | 1.64 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 235 | 1.84 | 2.01 Roof and ceiling only (tributary width of 4.9 m maximum)[6] | 2 β 38 Γ 286 | 2.09 | 2.33 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 89 | 0.79 | 0.74 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 140 | 1.13 | 1.02 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 184 | 1.33 | 1.20 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 235 | 1.59 | 1.45 Roof, ceiling and 1 storey[3][6][7] | 2 β 38 Γ 286 | 1.81 | 1.66 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 89 | 0.76 | 0.64 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 140 | 1.06 | 0.88 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 184 | 1.25 | 1.05 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 235 | 1.50 | 1.27 Roof, ceiling and 2 storeys[3][6][7] | 2 β 38 Γ 286 | 1.71 | 1.45 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 89 | 0.74 | 0.59 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 140 | 1.02 | 0.81 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 184 | 1.21 | 0.97 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 235 | 1.45 | 1.17 Roof, ceiling and 3 storeys[3][6][7] | 2 β 38 Γ 286 | 1.66 | 1.35 Notes to Table 9.23.12.3.-C: (1) Where structural sheathing is used, lintel spans may be increased by 15%. Structural sheathing consists of a minimum 9.5 mm thick structural panel conforming to CSA O121, CSA O151, CSA O325 or CSA O437.0 fastened with at least two rows of fasteners to the exterior face of the lintel, and a single row to the top plates and studs. Fasteners shall conform to Table 9.23.3.5.-A. (2) A single piece of 89 mm thick lumber may be used in lieu of 2 pieces of 38 mm thick lumber on edge. (3) If floor joists span the full width of the building without support, lintel spans shall be reduced by 15% for βRoof, ceiling and 1 storeyβ, by 20% for βRoof, ceiling and 2 storeysβ, and by 25% for βRoof, ceiling and 3 storeysβ. (4) For ends of lintels fully supported by walls, provide minimum bearing length of 38 mm for lintel spans up to 3 m, or minimum bearing length of 76 mm for lintel spans greater than 3 m. (5) Spans for 0.6 m tributary width are calculated for lintels in end walls that support only a 0.6 m width of roof and ceiling, but do not support roof joists, roof rafters or roof trusses. (6) Lintel spans are calculated based on a maximum floor joist, roof joist or rafter span of 4.9 m and a maximum roof truss span of 9.8 m. Lintel spans may be increased by 5% if rafter and joist spans are not more than 4.3 m and roof truss spans are not more than 8.6 m. Spans may be increased by 10% if rafter and joist spans are not more than 3.7 m and roof trusses are not more than 7.4 m. (7) Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load does not exceed that specified for residential areas as described in Table 4.1.5.3.
OBC Div. B Table 9.23.4.2-A. Maximum Spans for Floor Joists β General Cases with Strapping[2]
Open OBC Div. B Table 9.23.4.2-A. in the code viewerTable 9.23.4.2.-A β Maximum Spans for Floor Joists β General Cases with Strapping[2] Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(1) and (2), 9.23.4.4.(1) and 9.23.9.4.(1) to (3) Commercial Designation | Grade | Joist Size, mm | Joist Spacing, 300 mm | Joist Spacing, 400 mm | Joist Spacing, 600 mm Douglas Fir β Larch[3] | Select Structural | 38 Γ 89 | 2.13 m | 1.97 m | 1.73 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 140 | 3.23 m | 3.07 m | 2.73 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 184 | 3.88 m | 3.69 m | 3.51 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 235 | 4.57 m | 4.34 m | 4.13 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 286 | 5.21 m | 4.95 m | 4.71 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 89 | 2.00 m | 1.85 m | 1.66 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 140 | 3.09 m | 2.91 m | 2.62 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 184 | 3.71 m | 3.53 m | 3.36 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 235 | 4.38 m | 4.16 m | 3.96 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 286 | 4.99 m | 4.75 m | 4.52 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 89 | 1.90 m | 1.69 m | 1.38 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 140 | 2.78 m | 2.41 m | 1.97 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 184 | 3.38 m | 2.93 m | 2.39 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 235 | 4.14 m | 3.58 m | 2.93 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 286 | 4.80 m | 4.16 m | 3.39 m Douglas Fir β Larch[3] | Construction | 38 Γ 89 | 1.90 m | 1.77 m | 1.61 m Douglas Fir β Larch[3] | Standard | 38 Γ 89 | 1.81 m | 1.63 m | 1.33 m Hem β Fir[4] | Select Structural | 38 Γ 89 | 2.08 m | 1.93 m | 1.71 m Hem β Fir[4] | Select Structural | 38 Γ 140 | 3.18 m | 3.03 m | 2.69 m Hem β Fir[4] | Select Structural | 38 Γ 184 | 3.82 m | 3.64 m | 3.46 m Hem β Fir[4] | Select Structural | 38 Γ 235 | 4.50 m | 4.28 m | 4.08 m Hem β Fir[4] | Select Structural | 38 Γ 286 | 5.14 m | 4.89 m | 4.65 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 89 | 2.00 m | 1.85 m | 1.66 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 140 | 3.09 m | 2.91 m | 2.62 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 184 | 3.71 m | 3.53 m | 3.36 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 235 | 4.38 m | 4.16 m | 3.96 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 286 | 4.99 m | 4.75 m | 4.52 m Hem β Fir[4] | No. 3 | 38 Γ 89 | 1.90 m | 1.77 m | 1.61 m Hem β Fir[4] | No. 3 | 38 Γ 140 | 2.99 m | 2.78 m | 2.43 m Hem β Fir[4] | No. 3 | 38 Γ 184 | 3.60 m | 3.42 m | 2.95 m Hem β Fir[4] | No. 3 | 38 Γ 235 | 4.24 m | 4.03 m | 3.61 m Hem β Fir[4] | No. 3 | 38 Γ 286 | 4.84 m | 4.60 m | 4.19 m Hem β Fir[4] | Construction | 38 Γ 89 | 1.90 m | 1.77 m | 1.61 m Hem β Fir[4] | Standard | 38 Γ 89 | 1.81 m | 1.68 m | 1.39 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 89 | 1.95 m | 1.81 m | 1.64 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 140 | 3.05 m | 2.85 m | 2.57 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 184 | 3.66 m | 3.48 m | 3.31 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 235 | 4.31 m | 4.10 m | 3.90 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 286 | 4.91 m | 4.67 m | 4.45 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 89 | 1.86 m | 1.72 m | 1.58 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 140 | 2.92 m | 2.71 m | 2.49 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 184 | 3.54 m | 3.36 m | 3.20 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 235 | 4.17 m | 3.96 m | 3.77 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 286 | 4.75 m | 4.52 m | 4.30 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 89 | 1.81 m | 1.68 m | 1.55 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 140 | 2.84 m | 2.64 m | 2.43 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 184 | 3.47 m | 3.30 m | 2.95 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 235 | 4.09 m | 3.89 m | 3.61 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 286 | 4.67 m | 4.44 m | 4.19 m Spruce β Pine β Fir[5] | Construction | 38 Γ 89 | 1.81 m | 1.68 m | 1.55 m Spruce β Pine β Fir[5] | Standard | 38 Γ 89 | 1.70 m | 1.58 m | 1.44 m Northern Species[6] | Select Structural | 38 Γ 89 | 1.65 m | 1.53 m | 1.42 m Northern Species[6] | Select Structural | 38 Γ 140 | 2.59 m | 2.41 m | 2.24 m Northern Species[6] | Select Structural | 38 Γ 184 | 3.27 m | 3.11 m | 2.94 m Northern Species[6] | Select Structural | 38 Γ 235 | 3.85 m | 3.66 m | 3.48 m Northern Species[6] | Select Structural | 38 Γ 286 | 4.39 m | 4.18 m | 3.97 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 89 | 1.59 m | 1.48 m | 1.37 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 140 | 2.51 m | 2.33 m | 2.16 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 184 | 3.19 m | 3.04 m | 2.84 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 235 | 3.76 m | 3.58 m | 3.41 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 286 | 4.29 m | 4.08 m | 3.88 m Northern Species[6] | No. 3 | 38 Γ 89 | 1.54 m | 1.43 m | 1.32 m Northern Species[6] | No. 3 | 38 Γ 140 | 2.42 m | 2.24 m | 1.94 m Northern Species[6] | No. 3 | 38 Γ 184 | 3.12 m | 2.90 m | 2.37 m Northern Species[6] | No. 3 | 38 Γ 235 | 3.67 m | 3.49 m | 2.89 m Northern Species[6] | No. 3 | 38 Γ 286 | 4.19 m | 3.98 m | 3.36 m Northern Species[6] | Construction | 38 Γ 89 | 1.54 m | 1.43 m | 1.32 m Northern Species[6] | Standard | 38 Γ 89 | 1.48 m | 1.37 m | 1.15 m Table 9.23.4.2.-A (continued) β Maximum Spans for Floor Joists β General Cases with Bridging Commercial Designation | Grade | Joist Size, mm | Joist Spacing, 300 mm | Joist Spacing, 400 mm | Joist Spacing, 600 mm Douglas Fir β Larch[3] | Select Structural | 38 Γ 89 | 2.19 m | 1.99 m | 1.73 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 140 | 3.44 m | 3.12 m | 2.73 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 184 | 4.18 m | 3.92 m | 3.59 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 235 | 4.86 m | 4.57 m | 4.29 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 286 | 5.49 m | 5.16 m | 4.85 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 89 | 2.09 m | 1.90 m | 1.66 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 140 | 3.29 m | 2.99 m | 2.62 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 184 | 4.00 m | 3.76 m | 3.44 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 235 | 4.66 m | 4.38 m | 4.11 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 286 | 5.26 m | 4.94 m | 4.65 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 89 | 1.95 m | 1.69 m | 1.38 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 140 | 2.78 m | 2.41 m | 1.97 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 184 | 3.38 m | 2.93 m | 2.39 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 235 | 4.14 m | 3.58 m | 2.93 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 286 | 4.80 m | 4.16 m | 3.39 m Douglas Fir β Larch[3] | Construction | 38 Γ 89 | 2.03 m | 1.84 m | 1.61 m Douglas Fir β Larch[3] | Standard | 38 Γ 89 | 1.88 m | 1.63 m | 1.33 m Hem β Fir[4] | Select Structural | 38 Γ 89 | 2.16 m | 1.96 m | 1.71 m Hem β Fir[4] | Select Structural | 38 Γ 140 | 3.39 m | 3.08 m | 2.69 m Hem β Fir[4] | Select Structural | 38 Γ 184 | 4.12 m | 3.87 m | 3.54 m Hem β Fir[4] | Select Structural | 38 Γ 235 | 4.80 m | 4.51 m | 4.23 m Hem β Fir[4] | Select Structural | 38 Γ 286 | 5.42 m | 5.09 m | 4.78 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 89 | 2.09 m | 1.90 m | 1.66 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 140 | 3.29 m | 2.99 m | 2.62 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 184 | 4.00 m | 3.76 m | 3.44 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 235 | 4.66 m | 4.38 m | 4.11 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 286 | 5.26 m | 4.94 m | 4.65 m Hem β Fir[4] | No. 3 | 38 Γ 89 | 2.03 m | 1.84 m | 1.61 m Hem β Fir[4] | No. 3 | 38 Γ 140 | 3.19 m | 2.90 m | 2.43 m Hem β Fir[4] | No. 3 | 38 Γ 184 | 3.88 m | 3.61 m | 2.95 m Hem β Fir[4] | No. 3 | 38 Γ 235 | 4.51 m | 4.24 m | 3.61 m Hem β Fir[4] | No. 3 | 38 Γ 286 | 5.10 m | 4.79 m | 4.19 m Hem β Fir[4] | Construction | 38 Γ 89 | 2.03 m | 1.84 m | 1.61 m Hem β Fir[4] | Standard | 38 Γ 89 | 1.96 m | 1.71 m | 1.39 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 89 | 2.06 m | 1.87 m | 1.64 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 140 | 3.24 m | 2.95 m | 2.57 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 184 | 3.94 m | 3.70 m | 3.38 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 235 | 4.59 m | 4.31 m | 4.05 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 286 | 5.18 m | 4.87 m | 4.57 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 89 | 1.99 m | 1.81 m | 1.58 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 140 | 3.14 m | 2.85 m | 2.49 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 184 | 3.81 m | 3.58 m | 3.27 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 235 | 4.44 m | 4.17 m | 3.92 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 286 | 5.01 m | 4.71 m | 4.42 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 89 | 1.96 m | 1.78 m | 1.55 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 140 | 3.08 m | 2.80 m | 2.43 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 184 | 3.74 m | 3.52 m | 2.95 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 235 | 4.36 m | 4.09 m | 3.61 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 286 | 4.92 m | 4.62 m | 4.19 m Spruce β Pine β Fir[5] | Construction | 38 Γ 89 | 1.96 m | 1.78 m | 1.55 m Spruce β Pine β Fir[5] | Standard | 38 Γ 89 | 1.88 m | 1.71 m | 1.44 m Northern Species[6] | Select Structural | 38 Γ 89 | 1.84 m | 1.68 m | 1.46 m Northern Species[6] | Select Structural | 38 Γ 140 | 2.90 m | 2.63 m | 2.30 m Northern Species[6] | Select Structural | 38 Γ 184 | 3.52 m | 3.31 m | 3.03 m Northern Species[6] | Select Structural | 38 Γ 235 | 4.10 m | 3.85 m | 3.62 m Northern Species[6] | Select Structural | 38 Γ 286 | 4.63 m | 4.35 m | 4.09 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 89 | 1.80 m | 1.64 m | 1.43 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 140 | 2.83 m | 2.57 m | 2.25 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 184 | 3.44 m | 3.23 m | 2.96 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 235 | 4.01 m | 3.77 m | 3.54 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 286 | 4.53 m | 4.25 m | 4.00 m Northern Species[6] | No. 3 | 38 Γ 89 | 1.74 m | 1.57 m | 1.36 m Northern Species[6] | No. 3 | 38 Γ 140 | 2.74 m | 2.38 m | 1.94 m Northern Species[6] | No. 3 | 38 Γ 184 | 3.35 m | 2.90 m | 2.37 m Northern Species[6] | No. 3 | 38 Γ 235 | 3.91 m | 3.54 m | 2.89 m Northern Species[6] | No. 3 | 38 Γ 286 | 4.42 m | 4.11 m | 3.36 m Northern Species[6] | Construction | 38 Γ 89 | 1.74 m | 1.57 m | 1.40 m Northern Species[6] | Standard | 38 Γ 89 | 1.63 m | 1.41 m | 1.15 m Table 9.23.4.2.-A (continued) β Maximum Spans for Floor Joists β General Cases with Strapping[2] and Bridging Commercial Designation | Grade | Joist Size, mm | Joist Spacing, 300 mm | Joist Spacing, 400 mm | Joist Spacing, 600 mm Douglas Fir β Larch[3] | Select Structural | 38 Γ 89 | 2.19 m | 1.99 m | 1.73 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 140 | 3.44 m | 3.12 m | 2.73 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 184 | 4.37 m | 4.07 m | 3.59 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 235 | 5.05 m | 4.70 m | 4.39 m Douglas Fir β Larch[3] | Select Structural | 38 Γ 286 | 5.66 m | 5.28 m | 4.92 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 89 | 2.09 m | 1.90 m | 1.66 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 140 | 3.29 m | 2.99 m | 2.62 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 184 | 4.19 m | 3.90 m | 3.44 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 235 | 4.84 m | 4.51 m | 4.20 m Douglas Fir β Larch[3] | No. 1 and No. 2 | 38 Γ 286 | 5.43 m | 5.06 m | 4.72 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 89 | 1.95 m | 1.69 m | 1.38 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 140 | 2.78 m | 2.41 m | 1.97 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 184 | 3.38 m | 2.93 m | 2.39 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 235 | 4.14 m | 3.58 m | 2.93 m Douglas Fir β Larch[3] | No. 3 | 38 Γ 286 | 4.80 m | 4.16 m | 3.39 m Douglas Fir β Larch[3] | Construction | 38 Γ 89 | 2.03 m | 1.84 m | 1.61 m Douglas Fir β Larch[3] | Standard | 38 Γ 89 | 1.88 m | 1.63 m | 1.33 m Hem β Fir[4] | Select Structural | 38 Γ 89 | 2.16 m | 1.96 m | 1.71 m Hem β Fir[4] | Select Structural | 38 Γ 140 | 3.39 m | 3.08 m | 2.69 m Hem β Fir[4] | Select Structural | 38 Γ 184 | 4.31 m | 4.02 m | 3.54 m Hem β Fir[4] | Select Structural | 38 Γ 235 | 4.98 m | 4.64 m | 4.33 m Hem β Fir[4] | Select Structural | 38 Γ 286 | 5.59 m | 5.21 m | 4.86 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 89 | 2.09 m | 1.90 m | 1.66 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 140 | 3.29 m | 2.99 m | 2.62 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 184 | 4.19 m | 3.90 m | 3.44 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 235 | 4.84 m | 4.51 m | 4.20 m Hem β Fir[4] | No. 1 and No. 2 | 38 Γ 286 | 5.43 m | 5.06 m | 4.72 m Hem β Fir[4] | No. 3 | 38 Γ 89 | 2.03 m | 1.84 m | 1.61 m Hem β Fir[4] | No. 3 | 38 Γ 140 | 3.19 m | 2.90 m | 2.43 m Hem β Fir[4] | No. 3 | 38 Γ 184 | 4.06 m | 3.61 m | 2.95 m Hem β Fir[4] | No. 3 | 38 Γ 235 | 4.68 m | 4.37 m | 3.61 m Hem β Fir[4] | No. 3 | 38 Γ 286 | 5.26 m | 4.90 m | 4.19 m Hem β Fir[4] | Construction | 38 Γ 89 | 2.03 m | 1.84 m | 1.61 m Hem β Fir[4] | Standard | 38 Γ 89 | 1.96 m | 1.71 m | 1.39 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 89 | 2.06 m | 1.87 m | 1.64 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 140 | 3.24 m | 2.95 m | 2.57 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 184 | 4.12 m | 3.84 m | 3.38 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 235 | 4.76 m | 4.44 m | 4.14 m Spruce β Pine β Fir[5] | Select Structural | 38 Γ 286 | 5.34 m | 4.98 m | 4.64 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 89 | 1.99 m | 1.81 m | 1.58 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 140 | 3.14 m | 2.85 m | 2.49 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 184 | 3.99 m | 3.72 m | 3.27 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 235 | 4.60 m | 4.29 m | 4.00 m Spruce β Pine β Fir[5] | No. 1 and No. 2 | 38 Γ 286 | 5.17 m | 4.82 m | 4.49 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 89 | 1.96 m | 1.78 m | 1.55 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 140 | 3.08 m | 2.80 m | 2.43 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 184 | 3.92 m | 3.61 m | 2.95 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 235 | 4.52 m | 4.22 m | 3.61 m Spruce β Pine β Fir[5] | No. 3 | 38 Γ 286 | 5.08 m | 4.73 m | 4.19 m Spruce β Pine β Fir[5] | Construction | 38 Γ 89 | 1.96 m | 1.78 m | 1.55 m Spruce β Pine β Fir[5] | Standard | 38 Γ 89 | 1.88 m | 1.71 m | 1.44 m Northern Species[6] | Select Structural | 38 Γ 89 | 1.84 m | 1.68 m | 1.46 m Northern Species[6] | Select Structural | 38 Γ 140 | 2.90 m | 2.63 m | 2.30 m Northern Species[6] | Select Structural | 38 Γ 184 | 3.69 m | 3.44 m | 3.03 m Northern Species[6] | Select Structural | 38 Γ 235 | 4.26 m | 3.97 m | 3.70 m Northern Species[6] | Select Structural | 38 Γ 286 | 4.78 m | 4.45 m | 4.15 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 89 | 1.80 m | 1.64 m | 1.43 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 140 | 2.83 m | 2.57 m | 2.25 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 184 | 3.60 m | 3.36 m | 2.96 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 235 | 4.16 m | 3.88 m | 3.62 m Northern Species[6] | No. 1 and No. 2 | 38 Γ 286 | 4.67 m | 4.35 m | 4.06 m Northern Species[6] | No. 3 | 38 Γ 89 | 1.76 m | 1.60 m | 1.36 m Northern Species[6] | No. 3 | 38 Γ 140 | 2.75 m | 2.38 m | 1.94 m Northern Species[6] | No. 3 | 38 Γ 184 | 3.35 m | 2.90 m | 2.37 m Northern Species[6] | No. 3 | 38 Γ 235 | 4.06 m | 3.54 m | 2.89 m Northern Species[6] | No. 3 | 38 Γ 286 | 4.55 m | 4.11 m | 3.36 m Northern Species[6] | Construction | 38 Γ 89 | 1.76 m | 1.60 m | 1.40 m Northern Species[6] | Standard | 38 Γ 89 | 1.63 m | 1.41 m | 1.15 m Notes to Table 9.23.4.2.-A: (1) Spans apply only where the floors serve residential areas as described in Table 4.1.5.3., or the uniformly distributed live load on the floor does not exceed that specified for residential areas as described in Table 4.1.5.3. (2) See Sentence 9.23.9.4.(5) for alternatives to strapping. (3) Includes Douglas Fir and Western Larch. (4) Includes Western Hemlock and Amabilis Fir. (5) Includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir. (6) Includes any Canadian Species covered by the NLGA Standard Grading Rules.
OBC Div. B 9.23.9.4. Strapping, Bridging, Furring and Ceilings in Span Tables 9.23.4.2.-A and 9.23.4.2.-B)
Open OBC Div. B 9.23.9.4. in the code viewer(1)Except as permitted by Sentence (5), where strapping is specified in Span Table 9.23.4.2.-A, it shall be
(a)not less than 19 mm by 64 mm, nailed to the underside of floor joists,
(b)located not more than 2,100 mm from each support or other rows of strapping, and
(c)fastened at each end to a sill or header.
(2)Where bridging is specified in Span Table 9.23.4.2.-A, it shall consist of not less than 19 mm by 64 mm or 38 mm by 38 mm cross bridging located not more than 2,100 mm from each support or other rows of bridging.
(3)Where bridging and strapping are specified in Span Table 9.23.4.2.-A,
(a)bridging shall
(i)comply with Sentence (2), or
(ii)consist of 38 mm solid blocking located not more than 2,100 mm from each support or other rows of bridging and securely fastened between the joists, and
(b)except as provided in Sentence (5), strapping shall comply with Sentence (1) and be installed under the bridging.
(4)Bridging specified in Span Table 9.23.4.2.-B shall consist of
(a)bridging as described in Sentence (2), or
(b)38 mm solid blocking located not more than 2,100 mm from each support or other rows of bridging and securely fastened between the joists.
(5)Strapping described in Sentence (1) and Clause (3)(b) is not required where
(a)furring strips complying with Table 9.29.3.1. are fastened directly to the joists, or
(b)a panel-type ceiling finish complying with Subsection 9.29.5., 9.29.6., 9.29.7., 9.29.8., or 9.29.9. is attached directly to the joists.
(6)Where a ceiling attached to wood furring is specified in Span Table 9.23.4.2.-B,
(a)the ceiling finish shall consist of gypsum board, plywood or OSB not less than 12.7 mm thick, and
(b)the furring shall be,
(i)19 mm by 89 mm wood furring spaced at not more than 600 mm o.c., or
(ii)19 mm by 64 mm wood furring spaced at not more than 400 mm o.c.
OBC Div. B Table 9.23.4.2-F. Maximum Spans for Roof Rafters β Specified Roof Snow Loads 1.0 kPa
Open OBC Div. B Table 9.23.4.2-F. in the code viewerTable 9.23.4.2.-F β Maximum Spans for Roof Rafters β Specified Roof Snow Loads 1.0 kPa Forming Part of Sentences 9.23.2.8.(1), 9.23.4.2.(1), 9.23.4.5.(1) and 9.23.14.10.(2) Commercial Designation | Grade | Rafter Size, mm | Rafter Spacing 300 mm | Rafter Spacing 400 mm | Rafter Spacing 600 mm Douglas Fir β Larch[1] | Select Structural | 38 Γ 89 | 3.41 m | 3.10 m | 2.71 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 140 | 5.37 m | 4.88 m | 4.26 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 184 | 7.05 m | 6.41 m | 5.60 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 235 | 9.01 m | 8.18 m | 7.15 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 286 | 10.96 m | 9.96 m | 8.70 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 89 | 3.27 m | 2.97 m | 2.59 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 140 | 5.14 m | 4.67 m | 3.95 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 184 | 6.76 m | 5.88 m | 4.80 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 235 | 8.30 m | 7.19 m | 5.87 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 286 | 9.63 m | 8.34 m | 6.81 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 89 | 2.65 m | 2.30 m | 1.87 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 140 | 3.78 m | 3.28 m | 2.68 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 184 | 4.61 m | 3.99 m | 3.26 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 235 | 5.63 m | 4.88 m | 3.98 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 286 | 6.53 m | 5.66 m | 4.62 m Douglas Fir β Larch[1] | Construction | 38 Γ 89 | 3.17 m | 2.88 m | 2.42 m Douglas Fir β Larch[1] | Standard | 38 Γ 89 | 2.56 m | 2.22 m | 1.81 m Hem β Fir[2] | Select Structural | 38 Γ 89 | 3.36 m | 3.06 m | 2.67 m Hem β Fir[2] | Select Structural | 38 Γ 140 | 5.29 m | 4.81 m | 4.20 m Hem β Fir[2] | Select Structural | 38 Γ 184 | 6.96 m | 6.32 m | 5.52 m Hem β Fir[2] | Select Structural | 38 Γ 235 | 8.88 m | 8.07 m | 7.05 m Hem β Fir[2] | Select Structural | 38 Γ 286 | 10.81 m | 9.82 m | 8.58 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 89 | 3.27 m | 2.97 m | 2.59 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 140 | 5.14 m | 4.67 m | 4.08 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 184 | 6.76 m | 6.14 m | 5.04 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 235 | 8.63 m | 7.54 m | 6.16 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 286 | 10.11 m | 8.75 m | 7.15 m Hem β Fir[2] | No. 3 | 38 Γ 89 | 3.17 m | 2.83 m | 2.31 m Hem β Fir[2] | No. 3 | 38 Γ 140 | 4.67 m | 4.04 m | 3.30 m Hem β Fir[2] | No. 3 | 38 Γ 184 | 5.68 m | 4.92 m | 4.02 m Hem β Fir[2] | No. 3 | 38 Γ 235 | 6.95 m | 6.02 m | 4.91 m Hem β Fir[2] | No. 3 | 38 Γ 286 | 8.06 m | 6.98 m | 5.70 m Hem β Fir[2] | Construction | 38 Γ 89 | 3.17 m | 2.88 m | 2.51 m Hem β Fir[2] | Standard | 38 Γ 89 | 2.68 m | 2.32 m | 1.90 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 89 | 3.22 m | 2.92 m | 2.55 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 140 | 5.06 m | 4.60 m | 4.02 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 184 | 6.65 m | 6.05 m | 5.28 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 235 | 8.50 m | 7.72 m | 6.74 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 286 | 10.34 m | 9.40 m | 8.21 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 89 | 3.11 m | 2.83 m | 2.47 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 140 | 4.90 m | 4.45 m | 3.89 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 184 | 6.44 m | 5.85 m | 5.11 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 235 | 8.22 m | 7.47 m | 6.38 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 286 | 10.00 m | 9.06 m | 7.40 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 89 | 3.06 m | 2.78 m | 2.31 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 140 | 4.67 m | 4.04 m | 3.30 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 184 | 5.68 m | 4.92 m | 4.02 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 235 | 6.95 m | 6.02 m | 4.91 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 286 | 8.06 m | 6.98 m | 5.70 m Spruce β Pine β Fir[3] | Construction | 38 Γ 89 | 3.06 m | 2.78 m | 2.43 m Spruce β Pine β Fir[3] | Standard | 38 Γ 89 | 2.78 m | 2.41 m | 1.97 m Northern Species[4] | Select Structural | 38 Γ 89 | 2.88 m | 2.61 m | 2.28 m Northern Species[4] | Select Structural | 38 Γ 140 | 4.53 m | 4.11 m | 3.59 m Northern Species[4] | Select Structural | 38 Γ 184 | 5.95 m | 5.40 m | 4.72 m Northern Species[4] | Select Structural | 38 Γ 235 | 7.60 m | 6.90 m | 6.03 m Northern Species[4] | Select Structural | 38 Γ 286 | 9.25 m | 8.40 m | 7.01 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 89 | 2.81 m | 2.55 m | 2.23 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 140 | 4.42 m | 4.02 m | 3.44 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 184 | 5.81 m | 5.13 m | 4.19 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 235 | 7.24 m | 6.27 m | 5.12 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 286 | 8.40 m | 7.27 m | 5.94 m Northern Species[4] | No. 3 | 38 Γ 89 | 2.62 m | 2.27 m | 1.85 m Northern Species[4] | No. 3 | 38 Γ 140 | 3.74 m | 3.24 m | 2.65 m Northern Species[4] | No. 3 | 38 Γ 184 | 4.56 m | 3.94 m | 3.22 m Northern Species[4] | No. 3 | 38 Γ 235 | 5.57 m | 4.82 m | 3.94 m Northern Species[4] | No. 3 | 38 Γ 286 | 6.46 m | 5.60 m | 4.57 m Northern Species[4] | Construction | 38 Γ 89 | 2.74 m | 2.49 m | 2.11 m Northern Species[4] | Standard | 38 Γ 89 | 2.22 m | 1.93 m | 1.57 m Table 9.23.4.2.-F (continued) β Maximum Spans for Roof Rafters β Specified Roof Snow Loads 1.5 kPa Commercial Designation | Grade | Rafter Size, mm | Rafter Spacing 300 mm | Rafter Spacing 400 mm | Rafter Spacing 600 mm Douglas Fir β Larch[1] | Select Structural | 38 Γ 89 | 2.98 m | 2.71 m | 2.37 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 140 | 4.69 m | 4.26 m | 3.72 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 184 | 6.16 m | 5.60 m | 4.89 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 235 | 7.87 m | 7.15 m | 6.24 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 286 | 9.58 m | 8.70 m | 7.40 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 89 | 2.86 m | 2.59 m | 2.27 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 140 | 4.49 m | 4.08 m | 3.34 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 184 | 5.74 m | 4.97 m | 4.06 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 235 | 7.02 m | 6.08 m | 4.96 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 286 | 8.14 m | 7.05 m | 5.76 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 89 | 2.24 m | 1.94 m | 1.58 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 140 | 3.20 m | 2.77 m | 2.26 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 184 | 3.89 m | 3.37 m | 2.75 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 235 | 4.76 m | 4.12 m | 3.37 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 286 | 5.52 m | 4.78 m | 3.91 m Douglas Fir β Larch[1] | Construction | 38 Γ 89 | 2.77 m | 2.50 m | 2.04 m Douglas Fir β Larch[1] | Standard | 38 Γ 89 | 2.17 m | 1.88 m | 1.53 m Hem β Fir[2] | Select Structural | 38 Γ 89 | 2.94 m | 2.67 m | 2.33 m Hem β Fir[2] | Select Structural | 38 Γ 140 | 4.62 m | 4.20 m | 3.67 m Hem β Fir[2] | Select Structural | 38 Γ 184 | 6.08 m | 5.52 m | 4.82 m Hem β Fir[2] | Select Structural | 38 Γ 235 | 7.76 m | 7.05 m | 6.16 m Hem β Fir[2] | Select Structural | 38 Γ 286 | 9.45 m | 8.58 m | 7.28 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 89 | 2.86 m | 2.59 m | 2.27 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 140 | 4.49 m | 4.08 m | 3.50 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 184 | 5.90 m | 5.21 m | 4.26 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 235 | 7.36 m | 6.37 m | 5.20 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 286 | 8.54 m | 7.40 m | 6.04 m Hem β Fir[2] | No. 3 | 38 Γ 89 | 2.76 m | 2.39 m | 1.95 m Hem β Fir[2] | No. 3 | 38 Γ 140 | 3.95 m | 3.42 m | 2.79 m Hem β Fir[2] | No. 3 | 38 Γ 184 | 4.80 m | 4.16 m | 3.40 m Hem β Fir[2] | No. 3 | 38 Γ 235 | 5.87 m | 5.08 m | 4.15 m Hem β Fir[2] | No. 3 | 38 Γ 286 | 6.81 m | 5.90 m | 4.82 m Hem β Fir[2] | Construction | 38 Γ 89 | 2.77 m | 2.51 m | 2.14 m Hem β Fir[2] | Standard | 38 Γ 89 | 2.27 m | 1.96 m | 1.60 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 89 | 2.81 m | 2.55 m | 2.23 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 140 | 4.42 m | 4.02 m | 3.51 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 184 | 5.81 m | 5.28 m | 4.61 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 235 | 7.42 m | 6.74 m | 5.89 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 286 | 9.03 m | 8.21 m | 7.17 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 89 | 2.72 m | 2.47 m | 2.16 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 140 | 4.28 m | 3.89 m | 3.40 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 184 | 5.62 m | 5.11 m | 4.41 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 235 | 7.18 m | 6.52 m | 5.39 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 286 | 8.74 m | 7.66 m | 6.25 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 89 | 2.67 m | 2.39 m | 1.95 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 140 | 3.95 m | 3.42 m | 2.79 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 184 | 4.80 m | 4.16 m | 3.40 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 235 | 5.87 m | 5.08 m | 4.15 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 286 | 6.81 m | 5.90 m | 4.82 m Spruce β Pine β Fir[3] | Construction | 38 Γ 89 | 2.67 m | 2.43 m | 2.12 m Spruce β Pine β Fir[3] | Standard | 38 Γ 89 | 2.35 m | 2.04 m | 1.66 m Northern Species[4] | Select Structural | 38 Γ 89 | 2.51 m | 2.28 m | 1.99 m Northern Species[4] | Select Structural | 38 Γ 140 | 3.95 m | 3.59 m | 3.14 m Northern Species[4] | Select Structural | 38 Γ 184 | 5.20 m | 4.72 m | 4.12 m Northern Species[4] | Select Structural | 38 Γ 235 | 6.64 m | 6.03 m | 5.11 m Northern Species[4] | Select Structural | 38 Γ 286 | 8.08 m | 7.26 m | 5.93 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 89 | 2.46 m | 2.23 m | 1.95 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 140 | 3.86 m | 3.51 m | 2.91 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 184 | 5.00 m | 4.33 m | 3.54 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 235 | 6.12 m | 5.30 m | 4.33 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 286 | 7.10 m | 6.15 m | 5.02 m Northern Species[4] | No. 3 | 38 Γ 89 | 2.22 m | 1.92 m | 1.57 m Northern Species[4] | No. 3 | 38 Γ 140 | 3.16 m | 2.74 m | 2.24 m Northern Species[4] | No. 3 | 38 Γ 184 | 3.85 m | 3.33 m | 2.72 m Northern Species[4] | No. 3 | 38 Γ 235 | 4.71 m | 4.08 m | 3.33 m Northern Species[4] | No. 3 | 38 Γ 286 | 5.46 m | 4.73 m | 3.86 m Northern Species[4] | Construction | 38 Γ 89 | 2.40 m | 2.18 m | 1.90 m Northern Species[4] | Standard | 38 Γ 89 | 1.88 m | 1.63 m | 1.33 m Table 9.23.4.2.-F (continued) β Maximum Spans for Roof Rafters β Specified Roof Snow Loads 2.0 kPa Commercial Designation | Grade | Rafter Size, mm | Rafter Spacing 300 mm | Rafter Spacing 400 mm | Rafter Spacing 600 mm Douglas Fir β Larch[1] | Select Structural | 38 Γ 89 | 2.71 m | 2.46 m | 2.15 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 140 | 4.26 m | 3.87 m | 3.38 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 184 | 5.60 m | 5.09 m | 4.44 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 235 | 7.15 m | 6.49 m | 5.62 m Douglas Fir β Larch[1] | Select Structural | 38 Γ 286 | 8.70 m | 7.90 m | 6.52 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 89 | 2.59 m | 2.36 m | 2.06 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 140 | 4.08 m | 3.60 m | 2.94 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 184 | 5.06 m | 4.38 m | 3.58 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 235 | 6.19 m | 5.36 m | 4.38 m Douglas Fir β Larch[1] | No. 1 and No. 2 | 38 Γ 286 | 7.18 m | 6.22 m | 5.08 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 89 | 1.98 m | 1.71 m | 1.40 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 140 | 2.82 m | 2.44 m | 1.99 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 184 | 3.43 m | 2.97 m | 2.43 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 235 | 4.20 m | 3.64 m | 2.97 m Douglas Fir β Larch[1] | No. 3 | 38 Γ 286 | 4.87 m | 4.22 m | 3.44 m Douglas Fir β Larch[1] | Construction | 38 Γ 89 | 2.51 m | 2.21 m | 1.80 m Douglas Fir β Larch[1] | Standard | 38 Γ 89 | 1.91 m | 1.65 m | 1.35 m Hem β Fir[2] | Select Structural | 38 Γ 89 | 2.67 m | 2.43 m | 2.12 m Hem β Fir[2] | Select Structural | 38 Γ 140 | 4.20 m | 3.82 m | 3.33 m Hem β Fir[2] | Select Structural | 38 Γ 184 | 5.52 m | 5.02 m | 4.38 m Hem β Fir[2] | Select Structural | 38 Γ 235 | 7.05 m | 6.41 m | 5.54 m Hem β Fir[2] | Select Structural | 38 Γ 286 | 8.58 m | 7.80 m | 6.42 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 89 | 2.59 m | 2.36 m | 2.06 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 140 | 4.08 m | 3.71 m | 3.08 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 184 | 5.31 m | 4.60 m | 3.75 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 235 | 6.49 m | 5.62 m | 4.59 m Hem β Fir[2] | No. 1 and No. 2 | 38 Γ 286 | 7.53 m | 6.52 m | 5.33 m Hem β Fir[2] | No. 3 | 38 Γ 89 | 2.44 m | 2.11 m | 1.72 m Hem β Fir[2] | No. 3 | 38 Γ 140 | 3.48 m | 3.01 m | 2.46 m Hem β Fir[2] | No. 3 | 38 Γ 184 | 4.23 m | 3.67 m | 2.99 m Hem β Fir[2] | No. 3 | 38 Γ 235 | 5.18 m | 4.48 m | 3.66 m Hem β Fir[2] | No. 3 | 38 Γ 286 | 6.01 m | 5.20 m | 4.25 m Hem β Fir[2] | Construction | 38 Γ 89 | 2.51 m | 2.28 m | 1.89 m Hem β Fir[2] | Standard | 38 Γ 89 | 2.00 m | 1.73 m | 1.41 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 89 | 2.55 m | 2.32 m | 2.03 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 140 | 4.02 m | 3.65 m | 3.19 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 184 | 5.28 m | 4.80 m | 4.19 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 235 | 6.74 m | 6.13 m | 5.35 m Spruce β Pine β Fir[3] | Select Structural | 38 Γ 286 | 8.21 m | 7.46 m | 6.52 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 89 | 2.47 m | 2.24 m | 1.96 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 140 | 3.89 m | 3.53 m | 3.08 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 184 | 5.11 m | 4.64 m | 3.89 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 235 | 6.52 m | 5.82 m | 4.75 m Spruce β Pine β Fir[3] | No. 1 and No. 2 | 38 Γ 286 | 7.80 m | 6.76 m | 5.52 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 89 | 2.43 m | 2.11 m | 1.72 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 140 | 3.48 m | 3.01 m | 2.46 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 184 | 4.23 m | 3.67 m | 2.99 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 235 | 5.18 m | 4.48 m | 3.66 m Spruce β Pine β Fir[3] | No. 3 | 38 Γ 286 | 6.01 m | 5.20 m | 4.25 m Spruce β Pine β Fir[3] | Construction | 38 Γ 89 | 2.43 m | 2.20 m | 1.93 m Spruce β Pine β Fir[3] | Standard | 38 Γ 89 | 2.07 m | 1.79 m | 1.47 m Northern Species[4] | Select Structural | 38 Γ 89 | 2.28 m | 2.07 m | 1.81 m Northern Species[4] | Select Structural | 38 Γ 140 | 3.59 m | 3.26 m | 2.85 m Northern Species[4] | Select Structural | 38 Γ 184 | 4.72 m | 4.29 m | 3.68 m Northern Species[4] | Select Structural | 38 Γ 235 | 6.03 m | 5.48 m | 4.51 m Northern Species[4] | Select Structural | 38 Γ 286 | 7.34 m | 6.40 m | 5.23 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 89 | 2.23 m | 2.03 m | 1.77 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 140 | 3.51 m | 3.14 m | 2.56 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 184 | 4.41 m | 3.82 m | 3.12 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 235 | 5.40 m | 4.67 m | 3.82 m Northern Species[4] | No. 1 and No. 2 | 38 Γ 286 | 6.26 m | 5.42 m | 4.43 m Northern Species[4] | No. 3 | 38 Γ 89 | 1.95 m | 1.69 m | 1.38 m Northern Species[4] | No. 3 | 38 Γ 140 | 2.79 m | 2.42 m | 1.97 m Northern Species[4] | No. 3 | 38 Γ 184 | 3.40 m | 2.94 m | 2.40 m Northern Species[4] | No. 3 | 38 Γ 235 | 4.15 m | 3.60 m | 2.94 m Northern Species[4] | No. 3 | 38 Γ 286 | 4.82 m | 4.17 m | 3.41 m Northern Species[4] | Construction | 38 Γ 89 | 2.18 m | 1.93 m | 1.57 m Northern Species[4] | Standard | 38 Γ 89 | 1.66 m | 1.44 m | 1.17 m Notes to Table 9.23.4.2.-F: (1) Includes Douglas Fir and Western Larch. (2) Includes Western Hemlock and Amabilis Fir. (3) Includes Spruce (all species except Coast Sitka Spruce), Jack Pine, Lodgepole Pine, Balsam Fir and Alpine Fir. (4) Includes any Canadian Species covered by the NLGA Standard Grading Rules.