Intent 1:
To limit the probability of:
- [Clause 9.25.2.4.(6)(a)] inadequate attic or roof
space ventilation, and
- [Clause 9.25.2.4.(6)(b)] inadequate thermal resistance.
This is to limit the probability of:
- condensation, which could lead to the accumulation of
moisture,
- the formation of ice dams, which could lead to the ingress
of melted water,
- compromised thermal performance of components intended
to provide resistance to heat transfer, or
- excessively low temperatures of interior surfaces or
within assemblies.
This is to limit the probability of deterioration, which
could lead to compromised structural integrity of assemblies acting
as environmental separators, which could lead to harm to persons.