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3.2.2.21.(2)
ApplicationIntent
OS1OP1OS1OP1+
Attribution
(a),(b)
Application
Application 1: 
Fire-resistance rating of floor assemblies and of their supporting loadbearing walls, columns and arches of heavy timber construction in a storey in which more than 10% of the area is classified as a Group A, Division 1 major occupancy. This applies in buildings that:
  • are not more than 1 storey in building height,
  • have less than 40% of the area of the building as 2 storeys for the purpose of:
    • the development of productions, including the preparation of scenery and costumes and rehearsal of performers,
    • the organization of performers, scenery and sound equipment,
    • the preparation by performers for a performance,
    • managerial functions, or
    • toilets, rest rooms and similar public facilities,
  • have no occupancy above or below the auditorium other than one which serves it or is dependent on it,
  • are not more than 600 m2 in building area, and
  • have an occupant load of not more than 600.
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 more than 10% of the area is classified as a Group A, Division 1 major occupancy but the building complies with the conditions of Article 3.2.2.22.,
  • a storey in which more than 10% of the area is classified as a Group A, Division 1 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. or 3.2.2.22. to 3.2.2.83., and
  • a storey in which more than 10% of the area is classified as a Group A, Division 1 major occupancy but also has a portion of its floor area used for a Group F, Division 1 or 2 occupancy.
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Intent
Intent 1: 
To exempt heavy timber floor assemblies and their supporting elements from the requirement to have a 45 min fire-resistance rating, on the basis that experience has shown that this type of construction provides an adequate degree of resistance to failure or collapse from exposure to fire.
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