This roofing system is similar to the EPDM system. However, its synthetic single-ply membrane sheets are made of a number of other materials, most commonly polyvinyl chloride (PVC) and thermoplastic polyolefin (TPO). These membranes are available in a variety of thicknesses and colours.
![](https://bullockroofing.ca/wp-content/uploads/2019/06/carlisle_banner.jpg)