what is Torch on membrane?

What is a Torch-On Membrane?

A torch-on membrane (or torch-on felt) is a highly effective, heavy-duty waterproofing method primarily used for flat roofs, balconies, retaining walls, and decks. It consists of layers of modified bitumen (asphalt) that are reinforced with materials like fiberglass or polyester.

The name comes directly from the application process: a propane blowtorch is used to melt the underside of the membrane roll as it is unrolled onto the surface, creating a powerful, waterproof bond with the substrate.