Farm buildings (Part 2): BCIN Complex Buildings Study Guide

Last updated October 22, 2026

Values this chapter turns on

floor area per person, low human occupancy limit: 40 m²; floor area per person, low human occupancy limit
max G-1 floor area on one exit, unsprinklered: 10 m²; max G-1 floor area on one exit, unsprinklered
manure pit fan run time on emergency power: 2 h; manure pit fan run time on emergency power
min level of the outside farm alarm bell: 110 dBA; min level of the outside farm alarm bell

Part 2 of Division B is the Ontario code for larger farm buildings. It deals with the fire, structural and HVAC performance of farm buildings, and with farm processes that carry a risk of explosion or high flammability (OBC Div. B 2.1.1.1.). The Complex Buildings syllabus covers scope, classification, building size and construction, fire alarm, firefighting, emergency lighting, safety within floor areas, exits and hazardous substances. Structural loads (2.3) and most of ventilation (2.4.1 and 2.4.2) are excluded, as are the defined terms in 2.1.3.

Scope, application and classification

A farm building is any building or part of one that contains an agricultural occupancy (definition). Part 2 applies (2.1.2.1.) to:

Group G, Division 1, 2 or 3 farm buildings over 600 m² in building area or over 3 storeys in building height, and
every Group G, Division 4 building, of any size.

Smaller Group G-1, G-2 or G-3 farm buildings (3 storeys or less and 600 m² or less) follow the National Farm Building Code of Canada, with Ontario modifications and SB-1 climatic values (2.1.2.3.). A low human occupancy farm building in that size range may instead follow SB-11 for structure.

Occupant load decides whether it is Group G at all. If the agricultural area has not more than one person per 40 m², it is Group G. If it has more, it is classified under Table 3.1.2.1. like any other building (2.1.2.2.). That one person per 40 m² threshold is also the definition of low human occupancy (definition).

The four Divisions are listed in Table 2.1.4.1.:

Division	Short description
G-1	High-hazard agricultural occupancy
G-2	Agricultural occupancy not elsewhere classified
G-3	Greenhouse
G-4	No human occupants (storage)

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Building size, construction and fire protection

Occupancy combinations. A G-1 or G-4 building may not contain any Group A, B or C occupancy. A G-2 or G-3 building may not contain A-1, A-3 or Group B (2.2.1.2.). Small occupancies of not more than 10% of the storey's floor area can be ignored for construction purposes, unless they are F-1 or G-1 (2.2.1.3.). Required separations between major occupancies come from Table 2.2.1.4.; for example G-2 next to G-1 needs 2 h. Firewalls involving G-1, or separating Group G from a prohibited occupancy, are 4 h noncombustible (2.2.1.7.).

Construction articles (2.2.2.3. to 2.2.2.8.) allow combustible or noncombustible construction in every case, subject to limits:

Division	Limits
G-1 sprinklered	Up to 3 storeys; 4,800 / 2,400 / 1,600 m² for 1 / 2 / 3 storeys; 45 min floors
G-1 not sprinklered	1 storey, 2,400 m² (any area if livestock over below-floor liquid manure storage)
G-2 sprinklered	Any height, any area; 45 min floors
G-2	Up to 3 storeys, any area
G-3	1 storey, any area
G-4	Any height, any area

Additional separations (2.2.1.9.): fuel-fired appliances go in a service room with a 45 min separation (no rating needed if sprinklered); a farm machinery repair room needs 1 h, or 30 min if sprinklered; an incinerator room next to G-1 needs 2 h unsprinklered.

Fire alarm. An unsprinklered farm building needs a fire alarm system when it has G-1 with an occupant load over 25, or G-2 or G-3 with an occupant load over 150, more than 1 storey, or a basement used for more than service equipment (2.2.3.1.). G-1 gets a single-stage system (2.2.3.2.). An outside bell of at least 110 dBA is required, and visible signals where noise exceeds 87 dBA or occupants wear ear protection (2.2.3.4.). Signals cannot auto-silence for at least 20 min (2.2.3.5.).

Lighting. Where lighting is provided, emergency lighting averages at least 10 lx (minimum 1 lx) in exits and principal access routes, with 30 min of emergency power (2.2.5.1.).

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Safety, exits and hazardous substances

Egress doorways (2.2.6.2.). Two doorways are needed from a G-1 room over 15 m² (30 m² if sprinklered). For G-2, G-3 and livestock over liquid manure, the triggers are 200 m² or 15 m of travel unsprinklered, and 300 m² or 25 m sprinklered. Guards are 1,070 mm high where the drop exceeds 600 mm, with a mid rail and, where objects could fall, a 125 mm toe board (2.2.6.10.).

Exits (2.2.7.3. to 2.2.7.6.):

Item	G-1	G-2 / G-3
Single exit allowed if floor area not more than	10 m² (20 m² sprinklered)	200 m² (300 m² sprinklered)
Travel distance to an exit	30 m (60 m if livestock over liquid manure)	60 m, or 90 m sprinklered

Two exits must be at least half the maximum diagonal apart. An exterior exit door is at least 750 mm clear, and an exit window or panel at least 900 mm by 550 mm.

Hazards. Livestock barns over below-floor liquid manure need ventilation with emergency power that runs the fans at full load for 2 h and the trouble indicators for 24 h, with automatic transfer (2.2.8.3.). Pesticide storage is reached only from outdoors, has an impervious floor with no floor drain and a curb of at least 50 mm, a 1 h separation from other occupancies, and 6 m limiting distance from other buildings (2.2.8.8.).

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Common traps

Applying Part 2 to a small G-2 barn. Under 600 m² and 3 storeys, it follows the National Farm Building Code instead.
Forgetting that G-4 is covered by Part 2 at any size, but 2.2.6. and 2.2.7. (egress and exits) do not apply to it.
Using the G-2 single exit limit for G-1. G-1 is far stricter: 10 m².
Missing the 2 h generator run time for manure pit ventilation; 24 h is for the trouble indicators.

Chapter review

Chapter at a glance

One line per section: the idea to carry into the exam. Then the answers that most often catch candidates out.

Chapter at a glance: the key idea in each section
Section	Key idea
Scope, application and classification	A farm building is any building or part of one that contains an agricultural occupancy.
Building size, construction and fire protection	Additional separations: fuel-fired appliances go in a service room with a 45 min separation (no rating needed if sprinklered); a farm machinery repair room needs 1 h, or 30 min if…
Safety, exits and hazardous substances	Two exits must be at least half the maximum diagonal apart.

Scope, application and classification
A farm building is any building or part of one that contains an agricultural occupancy.
Building size, construction and fire protection
Additional separations: fuel-fired appliances go in a service room with a 45 min separation (no rating needed if sprinklered); a farm machinery repair room needs 1 h, or 30 min if…
Safety, exits and hazardous substances
Two exits must be at least half the maximum diagonal apart.

Usual exam traps

Applying Part 2 to a small G-2 barn. Under 600 m² and 3 storeys, it follows the National Farm Building Code instead.
Forgetting that G-4 is covered by Part 2 at any size, but 2.2.6. and 2.2.7. (egress and exits) do not apply to it.
Using the G-2 single exit limit for G-1. G-1 is far stricter: 10 m².
Missing the 2 h generator run time for manure pit ventilation; 24 h is for the trouble indicators.

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Questions on Farm buildings (Part 2), in the exam format, every answer explained and cited to its article. Sign in to start; a free account gets the free questions.

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Code cited in this chapter

Based on the official 2024 Building Code Compendium on ontario.ca.

OBC Div. B 2.1.1.1. Scope
(1)This Part is concerned with the fire, structural, heating, ventilating and air-conditioning performance of farm buildings, as well as processes and operations carried out therein that involve a risk of explosion, high flammability or related conditions that create a hazard to life safety. (See Note A-2.1.1.1.(1))
Open OBC Div. B 2.1.1.1. in the code viewer
OBC Div. A 1.4.1.2.(1) Farm building
Farm building means a building or part thereof that contains an agricultural occupancy. (See Note A-1.4.1.2.(1))
Open OBC Div. A 1.4.1.2.(1) in the code viewer
OBC Div. B 2.1.2.1. Application
(1)Except as provided in Sentences (2) and (3), this Part applies to all farm buildings
(a)that are
(i)more than 600 m² in building area or more than 3 storeys in building height used for major occupancies classified as Group G, Division 1, 2 or 3 agricultural occupancies, or
(ii)used for major occupancies classified as Group G, Division 4, with no human occupantsagricultural occupancies, and
(b)described in Sentence 2.1.2.2.(1).
(2)Subsections 2.2.6. and 2.2.7. do not apply to Group G, Division 4 major occupancies.
(3)farm buildings not described in Sentence (1) shall conform to the requirements of Article 2.1.2.3.
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OBC Div. B 2.1.2.3. Small Farm Buildings
(1)Except as provided in Sentences (2) to (6), farm buildings not more than 3 storeys in building height and not more than 600 m² in building area used for major occupancies classified as Group G, Division 1, 2, or 3 agricultural occupancies shall conform to the requirements in the CCBFC NRCC 38732 National Farm Building Code of Canada.
(2)Articles 1.1.1.2. and 3.1.8.1. and Subsections 3.1.4. and 4.1.4. in the CCBFC NRCC 38732 National Farm Building Code of Canada do not apply to farm buildings.
(3)Except as provided in Sentence (4), in the CCBFC NRCC 38732 National Farm Building Code of Canada, references in Articles 1.1.1.3., 2.2.2.1., 2.2.2.2., 2.3.1.1., 2.3.2.1., 3.1.1.1., 3.1.1.2., 3.1.2.1. and 3.1.6.1. to the CCBFC NRCC 38726 National Building Code of Canada, are deemed to be references to Ontario Regulation 403/97 (Building Code), as it read on December 30, 2006.
(4)The climatic values required for the design of farm buildings shall be in conformance with the climatic values provided in MMAH Supplementary Standard SB-1, Climatic and Seismic Data.
(5)A farm building of low human occupancy having a building area not exceeding 600 m² and not more than three storeys in building height is deemed to comply with the structural requirements of CCBFC NRCC 38732 National Building Code of Canada, if it is designed and constructed in conformance with MMAH Supplementary Standard SB-11, Construction of Farm Buildings.
(6)Where a floor area or portion of a floor area within a farm building is intended to contain a hazardous extraction operation involving cannabis, the floor area or portion of the floor area shall conform to the requirements of Article 2.2.8.9.
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OBC Div. B 2.1.2.2. Classification of Buildings Containing agricultural occupancies
(1)Buildings or parts of buildings containing an agricultural occupancy that has an occupant load of not more than one person per 40 m² shall be classified according to their major occupancy as belonging to Group G, Division 1, 2, 3 or 4.
(2)Buildings or parts of buildings containing an agricultural occupancy that has an occupant load of more than one person per 40 m² shall be classified according to their major occupancy as belonging to one of the Groups and Divisions listed in Table 3.1.2.1. of Division B.
(3)For the purposes of Sentences (1) and (2), the occupant load shall be determined based on the floor area or the part of the floor area that contains the agricultural occupancy.
(4)A building intended for use by more than one major occupancy shall be classified according to all the major occupancies for which it is used or intended to be used.
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OBC Div. A 1.4.1.2.(1) Low human occupancy
Low human occupancy means, when applied to a farm building, an occupancy in which the occupant load is not more than one person per 40 m² of floor area during normal use.
Open OBC Div. A 1.4.1.2.(1) in the code viewer
OBC Div. B Table 2.1.4.1. Classification of Agricultural major occupancies
Table 2.1.4.1. Classification of Agricultural major occupancies Forming Part of Sentence 2.1.4.1.(1) Group | Division | Description of Agricultural Occupancies G | 1 | High-hazard agricultural occupancies G | 2 | Agricultural occupancies not elsewhere classified in Group G G | 3 | Greenhouse agricultural occupancies G | 4 | Agricultural occupancies with no human occupants
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OBC Div. B 2.2.1.2. Prohibition of Occupancy Combinations
(1)Buildings classified as a Group G, Division 1 or 4 major occupancy shall not contain a Group A, B or C occupancy.
(2)Buildings classified as a Group G, Division 2 or 3 major occupancy shall not contain a Group A, Division 1 or 3, or Group B occupancy.
Open OBC Div. B 2.2.1.2. in the code viewer

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OBC Div. B 2.2.1.3. Exceptions for Major Occupancies
(1)In a farm building in which the aggregate area of all major occupancies in a particular Group or Division is not more than 10% of the floor area of the storey in which they are located, these major occupancies need not be considered as major occupancies for the purposes of Subsection 2.2.2., provided they are not classified as Group F, Division 1 or Group G, Division 1 occupancies.
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OBC Div. B Table 2.2.1.4. Minimum Fire-Resistance Rating of Fire Separation, h[¹]
Table 2.2.1.4. — Minimum Fire-Resistance Rating of Fire Separation, h[¹] Forming Part of Sentences 2.2.1.4.(1) and (3) Minimum Fire-Resistance Ratings of Fire separation, h — Adjoining Major Occupancy Major Occupancy | Adjoining Major Occupancy G-1 | Adjoining Major Occupancy G-2 | Adjoining Major Occupancy G-3 | Adjoining Major Occupancy G-4 A-1 | [²] | [³] | [³] | [²] A-2 | [²] | 1 | 1 | [²] A-3 | [²] | [³] | [³] | [²] A-4 | [²] | 1 | 1 | [²] B | [²] | [³] | [³] | [²] C | [²] | 1 | 1 | [²] D | 1 | N/A | N/A | N/A E | 1 | N/A | N/A | N/A F-1 | N/A | 2 | 2 | N/A F-2 | N/A | N/A | N/A | N/A F-3 | N/A | N/A | N/A | N/A G-1 | N/A | 2 | 2 | N/A G-2 | 2 | N/A | N/A | N/A G-3 | 2 | N/A | N/A | N/A G-4 | N/A | N/A | N/A | N/A Notes to Table 2.2.1.4.: (1) Article 2.2.1.9. contains requirements for other fire separations that are in addition to the requirements for the separation of major occupancies. (2) See Sentence 2.1.2.2.(1). (3) See Sentence 2.1.2.2.(2).
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OBC Div. B 2.2.1.7. Firewalls
(1)A firewall that separates a building or buildings with floor areas containing a Group G, Division 1 major occupancy shall be constructed as a fire separation of noncombustible construction having a fire-resistance rating not less than 4 h.
(2)A firewall that separates a building or buildings with floor areas containing a Group G major occupancy and a major occupancy prohibited by Article 2.2.1.2. shall be constructed as a fire separation of noncombustible construction having a fire-resistance rating not less than 4 h.
(3)Firewalls shall conform to the requirements of Articles 3.1.10.1. and 3.1.10.3. to 3.1.10.7., and Sentence 3.1.10.2.(3).
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OBC Div. B 2.2.2.3. Group G, Division 1, up to 3 Storeys, Limited Area, Sprinklered
(1)A building classified as Group G, Division 1 is permitted to be of combustible construction or noncombustible construction, used singly or in combination, provided
(a)the building is sprinklered throughout,
(b)the building is not more than 3 storeys in building height,
(c)the building has a building area not more than
(i)4,800 m², if 1 storey in building height,
(ii)2,400 m², if 2 storeys in building height, or
(iii)1,600 m², if 3 storeys in building height,
(d)floor assemblies, including the floor assembly immediately above a basement, are fire separations with a fire-resistance rating not less than 45 min, and
(e)loadbearing walls, columns and arches have a fire-resistance rating not less than that required for the supported assembly.
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OBC Div. B 2.2.2.8. Group G, Division 4, Any Height, Any Area
(1)A building classified as Group G, Division 4 of any building height or building area is permitted to be of combustible construction or noncombustible construction, used singly or in combination.
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OBC Div. B 2.2.1.9. Additional Fire Separations
(1)Except as permitted by Sentence (2) and required by Sentence (3), fuel-fired appliances shall be installed in service rooms separated from the remainder of the farm building by
(a)a fire separation having a fire-resistance rating not less than 45 min in a floor area that is not sprinklered throughout, or
(b)a fire separation not required to have a fire-resistance rating in a floor area that is sprinklered throughout.
(2)A fuel-fired appliance that serves only one room is not required to be installed in a service room separated from the remainder of the farm building.
(3)Incinerators shall be installed in service rooms that
(a)do not contain other fuel-fired appliances, and
(b)are separated from the remainder of the farm building by a fire separation having a fire-resistance rating not less than
(i)2 h, where the service room is adjacent to a Group G, Division 1 major occupancy in a floor area that is not sprinklered throughout,
(ii)1 h, where the service room is adjacent to a Group G, Division 1 major occupancy in a floor area that is sprinklered throughout,
(iii)1 h, where the service room is adjacent to a Group G, Division 2 or 3 major occupancy in a floor area that is not sprinklered throughout, or
(iv)30 min, where the service room is adjacent to a Group G, Division 2 or 3 major occupancy in a floor area that is sprinklered throughout.
(4)A room containing a device that produces open flames, heat or sparks and used for crop drying shall be separated from the remainder of the farm building by
(a)a fire separation having a fire-resistance rating not less than 45 min in a floor area that is not sprinklered throughout, or
(b)a fire separation not required to have a fire-resistance rating in a floor area that is sprinklered throughout.
(5)A room intended to be used for repairing farm machinery shall be separated from the remainder of the farm building by a fire separation having a fire-resistance rating not less than
(a)1 h, in a floor area that is not sprinklered throughout, or
(b)30 min, in a floor area that is sprinklered throughout.
(6)Storage areas for dangerous goods shall be separated from the remainder of the farm building in accordance with Sentences 3.3.6.2.(1) and (2).
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OBC Div. B 2.2.3.1. Determination of Requirement for a Fire Alarm System
(1)A fire alarm system complying with Sentence (2) shall be installed in a building that is not sprinklered throughout and that
(a)contains a Group G, Division 1 major occupancy with an occupant load more than 25, or
(b)contains a Group G, Division 2 or 3 major occupancy
(i)with an occupant load more than 150,
(ii)in a building more than 1 storey in building height, or
(iii)in a building with a basement used for a purpose other than the housing of service equipment.
(2)Except as otherwise provided in this Section, the fire alarm system required by Sentence (1) shall comply with Articles 3.2.4.2., 3.2.4.4., 3.2.4.5. and 3.2.4.17. and Sentences 3.2.4.9.(1) and (4).
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OBC Div. B 2.2.3.2. Types of Fire Alarm Systems
(1)The fire alarm system required by Sentence 2.2.3.1.(1) shall be
(a)a single-stage system in a Group G, Division 1 major occupancy, and
(b)a single- or 2-stage system in a Group G, Division 2 or 3 major occupancy.
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OBC Div. B 2.2.3.4. Fire Alarm Signals
(1)Except as provided in Sentence (3), the fire alarm system required by Sentence 2.2.3.1.(1) shall include
(a)audible signal devices conforming to Sentences 3.2.4.18.(1) to (4), (7) and (11),
(b)an audible alarm signal device with a sound pressure level not less than 110 dBA installed on the exterior of the farm building, and
(c)visible signal devices installed in any floor area in which
(i)the ambient noise level is more than 87 dBA,
(ii)the occupants use ear protection devices, or
(iii)the occupants are located in sound-insulating enclosures.
(2)The visible signal devices required by Clause (1)(c) shall be installed so that the signal from at least one device is visible throughout the floor area or portion thereof in which they are installed. (See Note A-3.2.4.19.(3))
(3)The audible alarm signal devices referred to in Clauses (1)(a) and (b) need not be provided in areas where animals are present, provided that visible signal devices are installed in accordance with Sentence (2).
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OBC Div. B 2.2.3.5. Silencing of Alarm Signals
(1)The fire alarm system required by Sentence 2.2.3.1.(1) shall
(a)be designed so that when an alarm signal is actuated, it cannot be silenced automatically before a period of time has elapsed that is not less than 20 min, and
(b)not incorporate manual silencing switches other than those installed inside the fire alarm control unit.
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OBC Div. B 2.2.5.1. Minimum Lighting Requirements
(1)Where lighting is provided in a farm building, emergency lighting shall be provided to an average level of illumination not less than 10 lx at floor or tread level in
(a)exits, and
(b)principal routes providing access to exit in open floor areas and in service rooms.
(2)The minimum value of the illumination required by Sentence (1) shall be 1 lx.
(3)An emergency power supply shall be
(a)provided to maintain the emergency lighting required by Sentence (1) from a power source such as batteries or generators that will continue to supply power in the event that the regular power supply to the farm building is interrupted, and
(b)designed and installed such that, upon failure of the regular power, it will assume the electrical load automatically for a period of 30 min.
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OBC Div. B 2.2.6.2. Egress Doorways
(1)Except as provided in Sentence (2), at least one egress doorway shall be provided from every room.
(2)A minimum of 2 egress doorways located so that one doorway could provide egress from the room as required by Article 2.2.6.3. if the other doorway becomes inaccessible to the occupants due to a fire originating in the room, shall be provided for every room
(a)that is used for a Group G, Division 1 major occupancy, other than one housing livestock with a below-floor storage area for liquid manure, where the area of the room is more than
(i)15 m², in a floor area that is not sprinklered throughout, or
(ii)30 m², in a floor area that is sprinklered throughout,
(b)in a floor area that is not sprinklered throughout and contains a Group G, Division 1 major occupancy housing livestock with a below-floor storage area for liquid manure or a Group G, Division 2 or 3 major occupancy, where
(i)the area of the room is more than 200 m², or
(ii)the travel distance within the room to the nearest egress doorway is more than 15 m, or
(c)in a floor area that is sprinklered throughout and contains a Group G, Division 1 major occupancy housing livestock with a below-floor storage area for liquid manure or a Group G, Division 2 or 3 major occupancy, where
(i)the area of the room is more than 300 m², or
(ii)the travel distance within the room to the nearest egress doorway is more than 25 m.
(3)Where 2 egress doorways are required by Sentence (2), they shall be placed at a distance from one another equal to or greater than one third of the maximum overall diagonal dimension of the area to be served, measured as the shortest distance that smoke would have to travel between the nearest required egress doorways.
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OBC Div. B 2.2.6.10. Guards
(1)Except as provided in Sentence (3), a guard not less than 1,070 mm high shall be provided
(a)around floor openings, where provision of a cover in accordance with Sentence 2.2.6.9.(1) is not practical, and
(b)at locations where the difference in elevation between two adjacent surfaces is more than 600 mm.
(2)The guard required by Sentence (1) shall consist of
(a)a top railing,
(b)an intermediate rail located at the mid-height of the guard, and
(c)where tools or other objects could fall from an upper floor surface onto a person on an adjacent lower surface, a toe board extending not less than 125 mm above the upper floor surface.
(3)Sentence (1) does not apply
(a)to vehicle repair pits,
(b)to loading docks, or
(c)where access is provided for maintenance purposes only.
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OBC Div. B 2.2.7.3. Minimum Number of Exits
(1)Except as provided by Sentences (2) and (3), every floor area shall be served by at least 2 exits.
(2)A floor area classified as a Group G, Division 1 major occupancy is permitted to be served by a single exit, provided the floor area is not more than
(a)10 m², where the floor area is not sprinklered throughout, or
(b)20 m², where the floor area is sprinklered throughout.
(3)A floor area classified as a Group G, Division 2 or 3 major occupancy is permitted to be served by a single exit, provided the floor area is not more than
(a)200 m², where the floor area is not sprinklered throughout, or
(b)300 m², where the floor area is sprinklered throughout.
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OBC Div. B 2.2.7.6. Width and Height of Exits
(1)The minimum clear width of an exterior doorway used as an exit shall be 750 mm.
(2)Except as provided in Sentence (3), the minimum headroom clearance in every exit shall conform to Article 3.4.3.4.
(3)An openable window or panel used as an exit shall have
(a)an opening not less than 900 mm by 550 mm, and
(b)a fire escape or stair, where required by Article 2.2.7.9.
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OBC Div. B 2.2.8.3. Below-Floor Storage Areas for Liquid Manure
(1)farm buildings housing livestock with a below-floor storage area for liquid manure shall be provided with a ventilation system conforming to Subsection 2.4.2.
(2)Where the ventilation system required by Sentence (1) relies on electrical power for normal operation, it shall be provided with an emergency power supply conforming to Sentence (3).
(3)The emergency power supply required by Sentence (2) shall be
(a)supplied from a generator, batteries or a combination thereof,
(b)equipped with audible and visible trouble indicators,
(c)capable of operating the trouble indicators for not less than 24 h,
(d)capable of operating the ventilation system under full load for not less than 2 h, and
(e)designed so that, in the event of a failure of the normal power source to the farm building, there is an immediate automatic transfer to emergency power.
(4)Where a fuel-fired engine or turbine for the emergency power supply required by Sentence (2) is dependent on a fuel supply located outside the farm building, the fuel supply shall be provided with a shut-off valve in conformance with Article 3.2.7.7.
(5)Where exhaust piping for the emergency power supply required by Sentence (2) penetrates a required fire separation, the piping shall be enclosed in a service space that is separated from the remainder of the farm building by a fire separation having a fire-resistance rating not less than that of the penetrated fire separation, but not less than 45 min.
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OBC Div. B 2.2.8.8. Pesticide Storage Areas
(1)In addition to the requirements of Article 2.2.8.7., pesticide storage areas in farm buildings shall be designed in conformance with this Article.
(2)Pesticide storage areas shall be
(a)ventilated with outdoor air in accordance with Subsection 2.4.2. by dedicated natural or mechanical means at a rate sufficient to prevent the accumulation of dangerous goods classified as toxic or flammable gases,
(b)accessible only from the outdoors, and
(c)secured against unauthorized entry.
(3)Floors of pesticide storage areas shall
(a)be constructed of concrete or other impervious material,
(b)not have a floor drain, and
(c)be provided with a curb at the perimeter of the storage area that is
(i)designed to contain accidental spillage of the largest container in the storage area, and
(ii)not less than 50 mm high.
(4)Pesticide storage areas shall be separated from
(a)food, feed and water supplies,
(b)otheroccupancies by a fire separation having a fire-resistance rating not less than 1 h, and
(c)other buildings by a limiting distance not less than 6 m.
Open OBC Div. B 2.2.8.8. in the code viewer