This form of waterproofing comes in a sheet and is rolled out onto the surface. This membrane is manufactured by modifying premium grade of asphalts with atactic polypropylene (APP) and specially reinforced with non-woven polyester felt.
Membrane waterproofing comes in two types; torch-on and self-adhesive. Torch-on membranes are applied with a blow torch and burned as they are being rolled out, whereas self-adhesive ones stick onto the surface.