POLYVAP Radonshield is a prefabricated waterproof plastomeric membrane made for special applications (as a vapour control layer and radon gas barrier). The compound comprises POLYPROPYLENE-modified distilled bitumen and the carrier is made from 0.06 mm-thick aluminium foil laminated with a reinforced fibre glass mat. The special compound gives the membrane remarkable low temperature flexibility properties. The sophisticated manufacturing technology guarantees superior product quality. POLYVAP Radonshield is a membrane produced to the quality standards set by NAT® technology the innovative manufacturing system for the control of polymer matrix ageing in bituminous membranes. POLYVAP Radonshield has Exceedsed radon gas permeability testing.