Fosroc Proofex Torchseal 3PI — 3mm Polyester-Reinforced APP Bituminous Waterproofing Membrane (1 roll)

Fosroc Proofex Torchseal 3PI is a 3mm thick, polyester internally reinforced, APP (Atactic Polypropylene) modified bituminous waterproofing membrane from Fosroc Chemicals India Pvt. Ltd. — torch-applied to form a seamless, fully bonded bitumen waterproofing barrier on roofs, terraces, basements, and structural concrete surfaces.

The internal polyester reinforcement (PI) is what distinguishes Torchseal 3PI from standard APP bitumen sheets. The polyester scrim core significantly improves the membrane's dimensional stability, tensile strength, and resistance to tearing during and after installation — reducing the risk of membrane damage during torch application, concrete backfilling, and long-term structural movement. For waterproofing contractors managing quality-sensitive projects, that reinforced construction delivers a more consistent, dependable installation outcome.

As an APP modified system, Torchseal 3PI flexes with thermal expansion and contraction cycles — a critical property for roof waterproofing and terrace waterproofing surfaces in India that face extreme summer heat and heavy monsoon rainfall season after season. The APP modification also improves UV stability and oxidation resistance compared to SBS-modified or unmodified bitumen membranes, giving the system a longer effective service life in exposed conditions.

Torch-applied over a compatible bitumen primer for maximum substrate adhesion, Proofex Torchseal 3PI delivers a proven, high-performance bituminous waterproofing solution for roof waterproofing, terrace waterproofing, basement waterproofing, and structural protection — backed by Fosroc's trusted construction chemical quality standards.