Intent 1:
To limit the probability of installation or in-service
damage to a single unsupported layer of sheathing membrane, which
could lead to:
- precipitation ingress, or
- excessive air infiltration or “wind-washing,” which
could lead to condensation or excessive heat transfer.
This is to limit the probability of
the failure of required environmental separation elements, which could
lead to:
- compromised thermal performance of components intended
to resist heat transfer, which could lead to an inadequate control
of the temperature of interior spaces 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.