Other Part 9 structural items (roofing, cladding, equipment, garages, cottages, logs, change of use)

Roofing and cladding

Roofing. A solar collector system may sit above roofing that meets 9.26.2.1 OBC Div. B 9.26.1.4.OBC Div. B 9.26.1.4. Solar Collector Systems(1) A solar collector system is permitted to be installed above roofing materials conforming to Sentence 9.26.2.1.(1).. Two roofing types can span between spaced supports instead of sitting on a deck. Each must then be designed for roof loads:

• sheet metal roofing, for the specified live loads for roofs OBC Div. B 9.26.13.2.OBC Div. B 9.26.13.2. Support(1) Where sheet metal roofing is not supported by roof decking but spans between spaced supports, the panels shall be designed to support the specified live loads for roofs.;
• glass reinforced polyester panels, for the specified roof loads OBC Div. B 9.26.14.1.OBC Div. B 9.26.14.1. Support(1) Where glass reinforced polyester roofing panels are not supported by roof decking but span between spaced supports, the panels shall be designed to support the specified roof loads..

Concrete roof tiles are installed to the CAN/CSA-A220 Series OBC Div. B 9.26.17.1.OBC Div. B 9.26.17.1. Installation(1) Concrete roof tiles shall be installed according to CAN/CSA-A220 Series, "Concrete Roof Tiles." (See Note A-9.26.17.1.(1)).

Cladding. Cladding is normally fastened to framing, furring or blocking. It may be fastened to the sheathing alone only when the sheathing is thick enough OBC Div. B 9.27.5.1.OBC Div. B 9.27.5.1. Attachment(1) Except as permitted by Sentences (2) to (5), cladding shall be fastened to the framing members or furring members, or to blocking between the framing members. (2) Vertical lumber, stucco lath or reinforcing, vertically applied vinyl siding, vertically applied insulated vinyl siding, and polypropylene siding are…:

A common trap is to apply the 7.5 mm value to vinyl siding.

Practice this topic

Equipment loads and seismic restraint

Where grab bars are provided, they must resist 1.3 kN applied vertically or horizontally OBC Div. B 9.31.2.3.OBC Div. B 9.31.2.3. Grab Bars(1) When provided, grab bars shall be capable of resisting a load of not less than 1.3 kN applied vertically or horizontally..

In locations where S_a(0.2) from SB-1 Table 3 is greater than 0.55, two kinds of equipment must be secured to the structure:

• service water heaters, against overturning OBC Div. B 9.31.6.2.OBC Div. B 9.31.6.2. Equipment and Installation(1) Every service water heater and its installation shall conform to Part 7. (2) Reserved (3) Where the building is in a location where the spectral response acceleration, S_a(0.2) , is greater than 0.55, service water heaters shall be secured to the structure to resist overturning. (See Note A-9.31.6.2.(3));
• heating and air-conditioning equipment with fuel or power connections, against overturning and displacement OBC Div. B 9.33.4.7.OBC Div. B 9.33.4.7. Structural Movement(1) Mechanical systems and equipment shall be designed and installed to accommodate the maximum amount of structural movement provided for in the construction of the building. (2) Where the building is in a location where the spectral acceleration, S_a(0.2) , is greater than 0.55, heating and air-conditioning….

Mechanical systems must also accommodate the structural movement the building is designed for.

Practice this topic

Garages and carports (9.35)

Section 9.35 covers garages and carports serving no more than one dwelling unit OBC Div. B 9.35.1.1.OBC Div. B 9.35.1.1. Application(1) This Section applies to garages and carports serving not more than one dwelling unit.. Foundations follow 9.12 and 9.15, including under the garage door OBC Div. B 9.35.3.1.OBC Div. B 9.35.3.1. Foundation Required(1) Except as permitted in this Subsection, foundations conforming to Sections 9.12. and 9.15. shall be provided for the support of carport and garage super-structures, including that portion beneath garage doors. (2) Detached garages of less than 55 m² floor area and not more than 1 storey in height that are not of….

A detached garage meeting all three of these limits may instead sit on wood mud sills, or on a concrete slab at least 100 mm thick:

• under 55 m²;
• one storey;
• no masonry or masonry veneer.

The same garages are also exempt from foundation drainage where the ground slopes away from them.

Other garage and carport rules:

• An attached garage in shifting clay should have foundations about as deep as the house. A slab-on-ground needs a construction joint where it meets the house slab OBC Div. B 9.35.3.2.OBC Div. B 9.35.3.2. Protection from Damage Due to Soil Movement(1) In clay-type soils subject to significant movement with a change in soil moisture content, the foundation depth of carports or garages connected to a dwelling unit directly or by a breezeway shall be approximately the same depth as the foundation of the main building. (2) Where slab-on-ground construction is used….
• Carport column piers rise at least 150 mm above ground. They extend at least 25 mm past the column base on each side, and are never smaller than 190 x 190 mm OBC Div. B 9.35.3.4.OBC Div. B 9.35.3.4. Column Piers(1) Piers for the support of carport columns shall extend not less than 150 mm above ground level. (2) Piers referred to in Sentence (1) shall project not less than 25 mm beyond the base of the column but in no case be less than 190 mm by 190 mm in size..
• Garage and carport columns follow 9.17, except that 89 x 89 mm wood columns are allowed OBC Div. B 9.35.4.2.OBC Div. B 9.35.4.2. Columns(1) Columns for garages and carports shall conform to Section 9.17., except that 89 mm by 89 mm wood columns may be used..
• Walls and columns are anchored against wind uplift under 9.23.6. A garage sitting on the ground surface needs ground anchors OBC Div. B 9.35.4.3.OBC Div. B 9.35.4.3. Anchorage(1) Garage or carport walls and columns shall be anchored to the foundation to resist wind uplift in conformance with Subsection 9.23.6., except that where a garage is supported on the surface of the ground, ground anchors shall be provided to resist wind uplift..

Practice this topic

Seasonal recreational buildings and logs (9.37, 9.38)

Cottages must meet Part 9, with some exemptions OBC Div. B 9.37.1.1.OBC Div. B 9.37.1.1. Application(1) This Section applies to buildings of residential occupancy used or intended to be used as seasonal recreational buildings. (2) The buildings described in Sentence (1) shall comply with all the requirements of this Part, except where they are specifically exempted in this Section.. Continuous perimeter foundation walls are not required. Unit masonry columns are limited in height by the least dimension of the column OBC Div. B 9.37.2.2.OBC Div. B 9.37.2.2. Foundations(1) Continuous perimeter foundation walls are not required, but when they are provided, they shall comply with the requirements of this Part. (2) Where unit masonry columns are used, the height of such columns shall not exceed, (a) in the case of hollow masonry units, 4 times the least dimension of the units, (b) in…:

Taller columns are designed to Part 4. Below-grade foundations and floors-on-ground still need dampproofing under Section 9.13 OBC Div. B 9.37.2.3.OBC Div. B 9.37.2.3. Waterproofing and Dampproofing(1) Where foundations below ground level and concrete floors on ground are used, they shall comply with Section 9.13..

Logs may be used structurally if analysis, tests or experience show they are adequate OBC Div. B 9.38.1.1.OBC Div. B 9.38.1.1. Material Requirements(1) Logs that are sound and free of fractures may be used for foundations, beams, posts and similar members, provided it can be shown by a structural analysis or tests or previous experience that the strength of the member is adequate for its intended purposes.. Logs touching masonry or concrete at or below grade are preservative-treated. Each horizontal log is fastened to its bearer in at least three places, never more than 1,800 mm apart OBC Div. B 9.38.2.3.OBC Div. B 9.38.2.3. Joining Logs(1) Each log in a horizontal position shall be scribed as close as possible to its bearer and fastened to the bearer in at least three places throughout its length, by dowels, continuous machined joints, vertical framing members or interlocking intersections or any combination of these, but in no case shall the…. Horizontal logs shrink, so every opening needs a settlement clearance between the rough buck header and the lintel log. It must be at least 13 mm for each 300 mm of opening height OBC Div. B 9.38.3.2.OBC Div. B 9.38.3.2. Clearance(1) At every opening in a wall made of logs in a horizontal position where shrinkage can occur there shall be a clearance between the rough buck header and the lintel log of not less than 13 mm in width for each 300 mm of height to allow for settlement..

Practice this topic

Park model trailers and change of use

Under Section 9.39 OBC Div. B 9.39.2.1.OBC Div. B 9.39.2.1. General(1) Except as provided in Subsection 9.39.3., a manufactured building used or intended to be used as a seasonal recreational building of residential occupancy is deemed to comply with this Code if it is designed and constructed in conformance with CAN/CSA-Z241 Series, "Park model trailers.", a park model trailer is deemed to comply with the Code if two conditions hold:

• it is built to CAN/CSA-Z241;
• it is used as a seasonal recreational building.

Components built off the factory site must still meet the Code. The trailer is supported and anchored to the manufacturer's installation instructions OBC Div. B 9.39.3.3.OBC Div. B 9.39.3.3. Foundations and Anchorage(1) Buildings described in Article 9.39.1.1. shall be supported and anchored in conformance with the manufacturer's installation instructions..

Change of use. Where a change of use occurs, the part of the building affected must be brought up to the listed Part 9 requirements for the new major occupancy OBC Div. B 9.41.2.1.OBC Div. B 9.41.2.1. Change of Use and Compensating Construction(1) Where proposed construction will result in a change of use described in Clauses 9.40.1.1.(1)(a) to (f), additional construction shall be required in order that the building or part of a building subject to the change of use conforms to the requirements of Subsections 9.5.1. and 9.5.3. to 9.5.10., Section 9.6.…. The listed requirements include doors, glass, guards, egress windows, flame spread, plumbing facilities, ventilation and electrical.

The key performance rule is that the building's performance level after construction may not be lower than before. It is evaluated under Part 11. Where it would drop, compensating construction is required under 11.4.3 OBC Div. B 9.41.2.2.OBC Div. B 9.41.2.2. Performance Level Evaluation and Compensating Construction(1) The performance level of a building after construction shall not be less than the performance level of the building prior to construction. (2) For the purposes of Sentence (1), reduction of performance level shall be determined in accordance with Articles 11.4.2.1., 11.4.2.3. and 11.4.2.5. (3) Where the proposed….

Practice this topic