Sentence 9.25.3.3.(7)

Intent 1:

To limit the probability of a discontinuous air barrier system, which could lead to:

• excessive airborne vapour transfer from interior above ground and exterior below ground, or
• precipitation ingress due to air pressure differences.

This is to limit the probability of deterioration, which could lead to compromised structural integrity of assemblies acting as or protected by environmental separators, which could lead to harm to persons.