Intent 1:
To limit the probability of blocking or furring
providing inadequate support and nailing surfaces for vertical edges
of interior finishes, sheathing or cladding materials, which could
lead to inadequate strength of wood-frame assemblies, which could
lead to an inability to resist expected vertical or lateral loads.
This is to limit the probability of:
- detachment or separation of interior finishes, sheathing
and cladding from supporting members,
- displacement of sheathing or cladding, or
- inadequate racking resistance for exterior walls and
lateral support of walls, where finishes, sheathing or cladding provide
required racking or buckling resistance.
Where wood-frame construction supports or is part of an
environmental separator, this is to limit the probability of the displacement
or failure of required environmental separation elements, which could
lead to:
- condensation,
- precipitation ingress,
- excessive heat transfer,
- pollutant ingress, or
- compromised thermal performance of components intended
to resist heat transfer.
This is to limit the probability of:
- inadequate control of temperatures of interior spaces,
drafts, relative humidity or water accumulation,
- the generation of pollutants from biological growth
or from materials that become unstable on wetting, or
- deterioration, which could lead to further compromised
integrity of environmental separators.
This is to limit the probability of:
- negative effects on the air quality of indoor spaces,
- the inadequate thermal comfort of persons, and
- contact with moisture.
This is to limit the probability of harm to persons.