The setting and material selection of waterproof vapor-permeable layers and
vapor barrier layers are critical for ensuring the thermal performance of envelope systems:
Waterproof: Provide good waterproof capacity and effectively
assist in realizing Class 1 water-tightness of steel structure roof.
Vapor-permeable: Effectively discharge moisture from
envelope systems, avoid ingress of condensate water, maintain a dry state of thermal insulation
layers and prevent the failure of
thermal insulation layers resulting from wetting or flooding.
Airtight: Block air flow, enhance airtightness of buildings,
and reduce the energy loss and degradation of thermal insulation effect resulting from air leakage.
Weather-proof: Withstand the attack of ultraviolet light and
high/low temperature durably and keep long-term waterproof, vapor-permeable and airtight functions
in place.
