(1) A building classified as Group A, Division 3 is permitted to conform to Sentence (2) provided,
(a) it is not more than 2 storeys in building height, and
(b) it has a building area not more than the value in Table 3.2.2.30.
(2) Except as permitted by Clauses (c) and (d), the building referred to in Sentence (1) shall be of noncombustible construction, and,
(a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h,
(b) mezzanines shall have a fire-resistance rating not less than 1 h,
(c) roof assemblies shall,
(i) have a fire-resistance rating not less than 45 min, or
(ii) be of heavy timber construction, and
(d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly, except that arches and structural members within the storey immediately below a roof assembly are permitted to be of heavy timber construction.
(3) If intended for occasional use for trade shows and similar exhibition purposes, the building referred to in Sentence (1) that is more than 1 500 m2 in building area shall be sprinklered.