Intent 1:
To limit the probability of inadequate depth or
thickness, which could lead to an inability to resist expected gravity
and lateral loads transferred from common rafters, which could lead
to the excessive deflection of rafters, which could lead to damage
to roofing.
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.