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For decades, bitumen (asphalt) has been used in waterproofing. However, raw bitumen becomes brittle in winter and melts in summer. Enter APP modification.

Atactic Polypropylene (APP) is a plastic polymer. When blended with bitumen, it radically improves its physical properties.

Why Choose APP Modified Bitumen?

High Temperature Resistance: APP membranes do not soften or flow at high temperatures, making them ideal for areas with intense sun exposure.

Torch-On Application: APP membranes are typically installed using a propane torch. The bottom layer melts and fuses to the substrate, creating an incredibly strong, seamless bond.

Puncture Resistance: Fortified with a polyester or fiberglass reinforcement core, these membranes resist tearing and foot traffic.

Sichern Engineering offers expert installation of premium APP modified bitumen membranes from world-leading manufacturers.