ARCHIVED - 3.2.2.69.(2)

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3.2.2.69.(2)


Objective	OP1 Fire Protection of the Building
Attribution	[F04-OP1.3] Applies to portion of Code text: “… c) roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, …” and to Clause (d).
Application	Application 1: Fire-resistance rating of combustible roof assemblies and of their supporting loadbearing walls, columns and arches in a storey in which an area is classified as a Group F, Division 2 major occupancy. This applies in buildings that: are not more than 3 storeys in building height, and have a building area not more than the value in Table 3.2.2.69. This applies to buildings to which Part 3 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 3]. Exceptions: except: a storey in which an area is classified as a Group F, Division 2 major occupancy but the building complies with the conditions of Articles 3.2.2.70., 3.2.2.71. or 3.2.2.72., a storey in which an area is classified as a Group F, Division 2 major occupancy but in addition has more than 10% of the area classified as a major occupancy that has more stringent requirements in accordance with Articles 3.2.2.20. to 3.2.2.68. and 3.2.2.70. to 3.2.2.83., a storey in which an area is classified as a Group F, Division 2 major occupancy but also has a portion of its floor area used for a Group F, Division 1 occupancy, as provided in Sentence 3.2.2.13.(1), which requires a roof assembly that supports an occupancy to be constructed in accordance with the fire separation requirements for floor assemblies, and as provided in Sentences 3.2.2.14.(2) and (4), which apply to the minimum fire-resistance rating of roof-top enclosures for elevator machinery rooms, service rooms and stairways.
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Intent	Intent 1: To limit the probability that loadbearing walls, columns and arches exposed to fire will prematurely fail or collapse, which could lead to the failure or collapse of a supported combustible roof assembly during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to damage to the building. Intent 2: To limit the probability that a combustible roof assembly exposed to fire will prematurely fail or collapse during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to damage to the building.
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