RIW Sheetseal GR - radon / methane gas barrier

RIW Sheetseal GR is a radon and methane gas barrier system used for internal and external basement tanking, retaining walls and as a ground floor DPM. It is a cold applied, high density polyethylene film bonded to aluminium foil and coated with a bitumen / rubber self adhesive layer with a removable reinforced silicone release paper. When