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9.26.7.4.(3) | Application | Intent |
OH1 | OS2 |
Objective | OS2 Structural Safety |
Attribution | |
Application | Application 1: Number of fasteners for asphalt shingles less than 1
m wide and for shingles incorporating interlocking devices, on roofs
of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]. Application 2: This also applies to asphalt shingles installed as
cladding, as stated in Sentence 9.27.1.1.(4). Application 3: This also applies to the fastening of asphalt shingles
on roofs with slopes of less than 1 in 3, as stated in Sentence 9.26.8.7.(1).
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Intent | Intent 1: To limit the probability that the shingle fastening will
be unable to resist uplift forces from wind, vibration and gravity, which
could lead to the displacement of shingles, which could lead to water penetrating
directly to roof decking or sheathing, which could lead to precipitation or
meltwater ingress, which could lead to deterioration, which could lead to
the structural failure of roofs or walls or of assemblies protected by roofs
or walls, which could lead to harm to persons. Intent 2: To expand the application of Sentences 9.26.7.4.(1) and (2) to
include constructions where relatively narrow shingles, or shingles that do
not rely solely on fasteners, are used. |
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