Intent 1:
To limit the probability of ties of inadequate strength,
which could lead to ties or rafter-to-joist connections being unable
to resist tension forces imposed by expected gravity and lateral loads,
which could lead to the lower end of rafters or joists moving outward,
which could lead to:
- the failure of roof rafters or joists, or supporting
walls, or
- the excessive deflection of roof rafters or joists,
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 supporting walls serve as an environmental separator
or where roof and ceiling framing members support elements of an environmental
separator, the excessive deformation, displacement or failure of required
environmental separation 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.