Estoproof 3P & 4P is a high performance APP Modified bituminous Torch applied waterproofing membrane; it is reinforced with spun bonded fibre rot proof polyester.
The underside of Estoproof 3P & 4P is finished with a light polyethylene foil. This increases flame-torching efficiency, reduces gas consumption and also protects the rolls during transport, handling and storage.
Estoproof 3P & 4P are composed of bitumen that is modified by APP, an atactic polypropylene polymer. The mixing has ensures that a true matrix inversion taken place, where the APP forms a continuous skeleton network with the bitumen filling up the void.
This result in much better cold flexes temperatures and aging resistance.