(1)
Except as provided in Sentences (1.1), (2), (4) and (6), each exposing building face and any exterior wall located above an exposing building face that encloses an attic or roof space shall be constructed in conformance with Subsection 9.10.8.,
(a)
for the exposing building face as a whole, or
(b)
for any number of separate portions of the exposing building face.
(1.1)
Sentence (1) does not apply where
(a)
the limiting distance is not less than 1.2 m,
(b)
the limiting distance is less than 1.2 m but not less than 0.6 m, provided that the exposing building face has a fire-resistance rating of not less than 45 min, or
(c)
the limiting distance is less than 0.6 m, provided that the exposing building face has a fire-resistance rating of not less than 45 min and is clad with noncombustible material.
(2)
Except as provided in Sentences (4) and (5), where the limiting distance is less than 0.6 m, the exposing building face and exterior walls located above the exposing building face that enclose an attic or roof space shall have a fire-resistance rating of not less than 45 min, and
(a)
the cladding shall be metal or noncombustible cladding installed in accordance with Section 9.20., 9.27. or 9.28., (See Note A-9.10.14.5.(1)),
(b)
the cladding shall
(i)
conform to Subsection 9.27.12.,
(ii)
be installed without furring members over gypsum sheathing at least 12.7 mm thick or over masonry,
(iii)
has a flame-spread rating not more than 25 when tested in accordance with Sentence 3.1.12.1.(2), and
(iv)
not exceed 2 mm in thickness exclusive of fasteners, joints and local reinforcements, or
(c)
the wall assembly shall comply with Clause 3.1.5.5.(1)(b) when tested in conformance with CAN/ULC-S134, “Standard Method of Fire Test of Exterior Wall Assemblies.”
(3)
Reserved.
(4)
The requirements for fire-resistance rating and type of cladding-sheathing assembly shall not apply to the exposing building face or projections from an exposing building face of a dwelling unit facing a detached garage or accessory building, or a 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.
(5)
Except for buildings containing 1 or 2 dwelling units only, combustible projections on the exterior of a wall that are more than 1 m above ground level and that could expose an adjacent building to fire spread shall not be permitted within
(a)
1.2 m of a property line or the centre line of a public way, or
(b)
2.4 m of a combustible projection on another building on the same property.
(6)
Reserved.
(7)
Reserved.
(8)
Reserved.
(9)
Reserved.
(10)
Reserved.
(11)
Reserved.
(12)
Reserved.
(13)
Heavy timber and steel columns need not conform to the requirements of Sentence (1) provided the limiting distance is not less than 3 m.