To limit the level of contaminants.
To resist the ingress of precipitation, water or moisture from the exterior or from the ground.
To resist the entry of vermin and insects.
To maintain appropriate air and surface temperatures.
To limit drafts.
To resist the ingress of precipitation, water or moisture from the exterior or from the ground.
To resist the entry of vermin and insects.
To resist deterioration resulting from expected service conditions.
To resist the entry of vermin and insects.
To resist deterioration resulting from expected service conditions.