5.5.1.1.(1)

Intent 1:

To limit the probability of:

• the inadequate control of vapour diffusion (except the diffusion of moisture from the ground) through environmental separators under expected environmental loads, or
• the inadequate venting of vapour to the exterior.

This is to limit the probability of the accumulation of condensation, which could lead to 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.