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 the 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,
or
- where supporting walls serve as an environmental separator
or where roof joists 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.
This is to limit the probability of:
- the space being unsuitable for its intended use,
- compromised operation of windows or doors, or
- damage to the building.