The Ontario Building Code | Openings in Exposing Building Face
9.10.14.4. openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings in Exposing building Face
(1) Except as provided in Sentences (3) to (7) 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)
| Item | Column 1 | Column 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
|
| Occupancy Classification of Building | Maximum Total Area of Exposing Building Face, m² | Maximum Aggregate Area of Unprotected Openings, % of Exposing Building Face Area | |||||||||||||
|
| Limiting Distance, m |
|
|
|
|
|
|
|
|
|
| |||||
|
| Less than 1.2 | 1.2 | 1.5 | 2 | 2.5 | 3 | 4 | 6 | 8 | 10 | 12 | 16 | 20 | 25 | ||
| 1. | Residential, business and personal services, and low-hazard industrial | 10 | 0 | 8 | 12 | 21 | 33 | 55 | 96 | 100 | — | — | — | — | — | — |
|
| 15 | 0 | 8 | 10 | 17 | 25 | 37 | 67 | 100 | — | — | — | — | — | — | |
|
| 20 | 0 | 8 | 10 | 15 | 21 | 30 | 53 | 100 | — | — | — | — | — | — | |
|
| 25 | 0 | 8 | 9 | 13 | 19 | 26 | 45 | 100 | — | — | — | — | — | — | |
|
|
| 30 | 0 | 7 | 9 | 12 | 17 | 23 | 39 | 88 | 100 | — | — | — | — | — |
|
|
| 40 | 0 | 7 | 8 | 11 | 15 | 20 | 32 | 69 | 100 | — | — | — | — | — |
|
|
| 50 | 0 | 7 | 8 | 10 | 14 | 18 | 28 | 57 | 100 | — | — | — | — | — |
|
|
| 100 | 0 | 7 | 8 | 9 | 11 | 13 | 18 | 34 | 56 | 84 | 100 | — | — | — |
|
|
| Over 100 | 0 | 7 | 7 | 8 | 9 | 10 | 12 | 19 | 28 | 40 | 55 | 92 | 100 | — |
| 2. | Mercantile and medium-hazard industrial | 10 | 0 | 4 | 6 | 10 | 17 | 25 | 48 | 100 | — | — | — | — | — | — |
|
| 15 | 0 | 4 | 5 | 8 | 13 | 18 | 34 | 82 | 100 | — | — | — | — | — | |
|
| 20 | 0 | 4 | 5 | 7 | 11 | 15 | 27 | 63 | 100 | — | — | — | — | — | |
|
|
| 25 | 0 | 4 | 5 | 7 | 9 | 13 | 22 | 51 | 94 | 100 | — | — | — | — |
|
|
| 30 | 0 | 4 | 4 | 6 | 9 | 12 | 20 | 44 | 80 | 100 | — | — | — | — |
|
|
| 40 | 0 | 4 | 4 | 6 | 8 | 10 | 16 | 34 | 61 | 97 | 100 | — | — | — |
|
|
| 50 | 0 | 4 | 4 | 5 | 7 | 9 | 14 | 29 | 50 | 79 | 100 | — | — | — |
|
|
| 100 | 0 | 4 | 4 | 4 | 5 | 6 | 9 | 17 | 28 | 42 | 60 | 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 ratingrequired for the wall.
(3) The maximum aggregate area of unprotected openingsshall be not more than 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.
(4) Where the building is sprinklered, the maximum aggregate area of unprotected openings shall be not more than 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 3.2.5.13.
(5) 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.
(6) The maximum aggregate area of unprotected openings in an exposing building face of a storey that faces a streetand is the same level as the street need not comply with Sentence (1) where the limiting distance is not less than 9 m.
(7) The limits on the area of unprotected 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 a single 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 buildingis the only major occupancy on the property.
Note: On July 1, 2017, Sentence 9.10.14.4.(7) of Division B of the Regulation is revoked and the following substituted: (See: O. Reg. 139/17, s. 109)
(7) The limits on the area of unprotected openings need not apply to the exposing building face of a detached garage or accessory building facing a house, where,
(a) the detached garage or accessory building serves the house or an individual dwelling unit in the house,
(b) the detached garage or accessory building is located on the same property as the house, and
(c) the house is the only major occupancy on the property.