PVC Roofing Membranes
A PVC roof is a single-ply membrane that consist of two plies or layers of PVC material with a polyester reinforcement scrim between the layers. The top ply has special additives to make the membrane UV stable and prevent curing, plasticizers to make it flexible, and pigments for colour. During the installation, PVC roofing membrane sheets are connected together by using hot-air welding (fusion welding) of seams, which creates a permanent physical bond between two separate sheets of roofing membrane. This hot-air welding process is what makes PVC roofing such a great roofing product – it can remain water-tight and pliable for decades after the original installation.
What is PVC?
PVC (Polyvinyl Chloride) is one of the most-commonly used type of plastics in the world. There are many reasons why PVC is so popular among all the other plastics. It’s due to the fact that PVC is generally cheaper than many other plastics and its incredible durability. Unlike many other plastics that are essentially made of 100% fossil fuels, PVC is made of only about 50% fossil fuel, namely natural gas or methane. The second half is chlorine, a gas that is a main component of rock-salt.