3.2.3.12 — Area Increase for Unprotected Openings

(1) Except as permitted by Articles 3.1.8.16. and 3.1.8.17. for the separation of exits, an opening in a fire separation having a fire-resistance rating not more than 1 h is permitted to be protected with fixed wired glass assemblies or glass blocks installed in conformance with NFPA 80, “Fire Doors and Other Opening Protectives”. (2) Wired glass assemblies permitted by Sentence (1) and described in MMAH Supplementary Standard SB-2, “Fire Performance Ratings”, are permitted to be used as closures in vertical fire separations without being tested in accordance with Sentence 3.1.8.4. (1). (3) Glass blocks permitted by Sentence (1) shall be installed in accordance with Subsection 4.3.2. and reinforced with steel reinforcement in each horizontal joint.

(1) Except as provided by Sentences (3) to (5) and Articles 3.2.3.10. and 3.2.3.11, the fire-resistance rating, construction and cladding for exposing building faces of buildings or fire compartments shall comply with Table 3.2.3.7. (2) Reserved (3) Except as provided by Sentences (4) and (5) and Articles 3.1.4.8. and 3.1.6.9., cladding for buildings or fire compartments where the maximum permitted area of unprotected openings is more than 10% of the exposing building face need not be noncombustible where the wall assembly complies with the requirements of Sentence 3.1.5.5. (1) when tested in conformance with CAN/ULC-S134, “Fire Test of Exterior Wall Assemblies”. (4) Except as provided by Articles 3.1.4.8. and 3.1.6.9., cladding for buildings or fire compartments where the maximum permitted area of unprotected openings is more than 10% but not more than 25% of the exposing building face need not be noncombustible where the wall assembly complies with Article 3.1.5.5. (5) Except as provided by Articles 3.1.4.8. and 3.1.6.9., cladding for buildings or fire compartments where the maximum permitted area of unprotected openings is more than 25% but not more than 50% of the exposing building face need not be noncombustible where, (a) the limiting distance is greater than 5 m, (b) the building or fire compartment and all combustible attic or roof spaces are sprinklered, (c) the cladding, (i) conforms to Subsection 9.27.6., 9.27.7., 9.27.8., 9.27.9. or 9.27.10., (ii) is installed without furring members, or on furring not more than 25 mm thick, over gypsum sheathing at least 12.7 mm thick or over masonry, and (iii) after conditioning in conformance with ASTM D2898, “Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing”, has a flame-spread rating not greater than 25 on the exterior face when tested in accordance with Sentence 3.1.12.1. (1), (d) the cladding, (i) conforms to Subsection 9.27.12., (ii) is installed with or without furring members over gypsum sheathing at least 12.7 mm thick or over masonry, (iii) has a flame-spread rating not greater than 25 when tested in accordance with Sentence 3.1.12.1. (2), and (iv) does not exceed 2 mm in thickness exclusive of fasteners, joints and local reinforcements, or (e) the wall assembly complies with Article 3.1.5.5. (6)[[NO_FORMULA]] Revoked: O. Reg. 89/23, s. 9 (5). (7)[[NO_FORMULA]] Revoked: O. Reg. 89/23, s. 9 (5). (8) The construction requirements for the exposing building face that are listed in Table 3.2.3.7. shall be satisfied before the area of unprotected openings may be increased as permitted by Sentence 3.2.3.12. (1).