The APP modified asphalt is reinforced with a polyester mat and manufactured into a roll product. These membranes have extra asphalt on the back side which allows it to stick to the substrate through application methods like heat welded or torch applied.
Torch Applied – The APP modified membrane is applied using an open flame torch to melt the bottom side of the sheet as it is being put on your roof.
Heat Welding – The welder is used to push out hot air, which helps fuse the back side of the membrane to the substrate. This method is a safer than torch applied, as it is less of a fire hazard.
Hot Asphalt application – Hot Asphalt is placed on the felts or substrate with a mop or a machine and then the membrane is laid over the hot asphalt. The hot asphalt acts as the adhesive and makes the membrane stick to the substrate.
Cold Adhesive – The modified membrane is set in a cold process using specially formulated asphalt based adhesives as it is being applied.
Self Adhered – The bottom surface of the membrane is covered with an adhesive and release paper. Once the paper is removed the adhesive allows the membrane to adhere to the substrate without the use of additional adhesives.