5.4.1.2.(1)

Intent 1:

To limit the probability that the airtightness of the installed materials will be inadequate for the control of:

• precipitation ingress due to air pressure differences,
• the condensation of moisture from interior spaces on interior surfaces or within assemblies, or
• the ingress of airborne moisture from the ground into or through assemblies.

This is to limit the probability of deterioration, which could lead to compromised structural integrity of environmental separators or of elements supported or protected by the separators, which could lead to structural failure, which could lead to harm to persons.