SAPPI APP Torch On roofing membranes are a range of prefabricated polymeric bitumen membranes manufactured from distilled bitumen, modified by high molecular weight plastomeric-polymers (APP), that give the water proofing compound excellent thermal stability. Resistance to atmospheric conditions and aging due to temperature variation, reinforced with none-woven polyester or glass fibre. The elastoplastomeric membranes in the APP Torch On roofing membranes range represent the advancements of modern technology and when used correctly it can satisfy every requirement of a water-proofing membrane.