Intent 1:
To limit the probability of inadequate strength
of intermediate support for rafters, which could lead to an inability
to resist expected compressive loads transferred from opposing rafters,
which could lead to failure of intermediate support members.
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
Intent 2:
To further define the application of the span tables.