RIW Gas Seal Black, low-density polyethylene gas barrier

RIW Gas Seal Black is a four-layer loose laid, low-density polyethylene gas barrier containing an integral aluminium foil. It is typically used to protect the structure from hydrocarbon vapours, methane, carbon dioxide, radon and moisture from the ground. RIW Gas Seal Black can be seam welded to form a monolithic membrane, but the laps can also be