9.25.3.3.(6)

Intent 1:

To limit the probability of a discontinuous air barrier system at penetrations through assemblies, which could lead to a loss of airtightness, 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 condensation or the accumulation of water, which could lead to deterioration, which could lead to compromised structural integrity of assemblies acting as or protected by environmental separators, which could lead to harm to persons.