Intent 1:
To limit the probability of:
- inadequate support for roof joists and rafters, which
could lead to an inability to resist expected gravity loads, which
could lead to crushing, or
- insufficient area for fastening, which could lead to
an inability to resist expected lateral or wind-uplift loads, which
could lead to the separation of roofs from walls.
This is to limit the probability of
compromised structural integrity, which could lead to:
- the structural collapse of wood-frame construction,
- where roof and ceiling framing members support required
elements of environmental separators, the excessive deformation, displacement
or failure of these elements, which could lead to deterioration, which
could lead to further compromised structural integrity of roofs or
environmental separators, or
- where roof and ceiling framing members support assemblies
exposed to the exterior, excessive water ingress, which could lead
to deterioration.
This is to limit the probability of harm to persons.