9.10.14.4.Openings in Exposing Building Face

(1) Except as provided in Sentences (6) to (10) and Sentence 9.10.14.6.(1), the maximum aggregate area of unprotected openings in an exposing building face shall (a) conform to Table 9.10.14.4., (b) conform to Subsection 3.2.3., or (c) where the limiting distance is not less than 1.2 m, be equal to or less than (i) the limiting distance squared, for residential occupancies, business and personal services occupancies and low-hazard industrial occupancies, and (ii) half the limiting distance squared, for mercantile occupancies and medium-hazard industrial occupancies. Table 9.10.14.4. Maximum Aggregate Area of Unprotected Openings in Exterior Walls Forming Part of Sentence 9.10.14.4.(1) Maximum Maximum Aggregate Area of Unprotected Openings, % of Exposing Building Face Area Occupancy Total Area of Limiting Distance, m Classification of Exposing Less Building Building than 1.2 1.5 2 2.5 3 4 6 8 10 12 16 20 25 Face, m² 1.2 10 0 8 12 21 33 55 96 100 100 100 100 100 100 100 15 0 8 10 17 25 37 67 100 100 100 100 100 100 100 20 0 8 10 15 21 30 53 100 100 100 100 100 100 100 Residential, business 25 0 8 9 13 19 26 45 100 100 100 100 100 100 100 and personal services, 30 0 7 9 12 17 23 39 88 100 100 100 100 100 100 and low-hazard industrial 40 0 7 8 11 15 20 32 69 100 100 100 100 100 100 50 0 7 8 10 14 18 28 57 100 100 100 100 100 100 100 0 7 8 9 11 13 18 34 56 84 100 100 100 100 Over 100 0 7 7 8 9 10 12 19 28 40 55 92 100 100 10 0 4 6 10 17 25 48 100 100 100 100 100 100 100 15 0 4 5 8 13 18 34 82 100 100 100 100 100 100 20 0 4 5 7 11 15 27 63 100 100 100 100 100 100 Mercantile and 25 0 4 5 7 9 13 22 51 94 100 100 100 100 100 medium-hazard 30 0 4 4 6 9 12 20 44 80 100 100 100 100 100 industrial 40 0 4 4 6 8 10 16 34 61 97 100 100 100 100 50 0 4 4 5 7 9 14 29 50 79 100 100 100 100 100 0 4 4 4 5 6 9 17 28 42 60 100 100 100 Over 100 0 4 4 4 4 5 6 10 14 20 27 46 70 100 (2) Except as provided in Sentence 9.10.14.6.(1), openings in a wall having a limiting distance of less than 1.2 m shall be protected by closures, of other than wired glass or glass block, whose fire protection rating is in conformance with the fire-resistance rating required for the wall. (3) Reserved. (4) Reserved. (5) Reserved. (6) The maximum aggregate area of unprotected openings is permitted to be up to twice the area determined according to Sentence (1), where the unprotected openings are glazed with (a) wired glass in steel frames as described in Article 9.10.13.5., or (b) glass blocks, as described in Article 9.10.13.7. (7) Where the building is sprinklered, the maximum aggregate area of unprotected openings is permitted to be up to twice the area determined according to Sentence (1), provided all rooms, including closets and bathrooms, that are adjacent to the exposing building face and that have unprotected openings are sprinklered, notwithstanding any exemptions in the sprinkler standards referenced in Article 3.2.5.12. (8) The maximum aggregate area of unprotected openings in an exposing building face of a storage garage need not comply with Sentence (1), where (a) all storeys are constructed as open-air storeys, and (b) the storage garage has a limiting distance of not less than 3 m. (9) The maximum aggregate area of unprotected openings in an exposing building face of a storey that faces a street and is the same level as the street need not comply with Sentence (1) where the limiting distance is not less than 9 m. (10) Except as provided in Sentence (11), for garages or accessory buildings that serve a single dwelling unit only and are detached from any building, the maximum aggregate area of glazed openings shall comply with the requirements for unprotected openings. (11) The limits on the area of glazed openings need not apply to the exposing building face of a detached garage or accessory building facing a dwelling unit, where (a) the detached garage or accessory building serves only one dwelling unit, (b) the detached garage or accessory building is located on the same property as that dwelling unit, and (c) the dwelling unit served by the detached garage or accessory building is the only major occupancy on the property.