Intent 1:
To limit the probability of:
- excessive heat loss or gain due to air mass transfer,
- excessive air infiltration and exfiltration,
- excessive airborne vapour transfer from interior above
ground and exterior below ground,
- 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.