Here is what a popular site has to say about TPO Commercial Roofing What is TPO? The TPO membrane was first introduced to the roofing market in the early 1990’s as a more economical and efficient alternative that was thought to replace PVC roofing products. TPO is a single ply roofing system that consisting of a thermoplastic polyolefin membrane. This membrane is composed of three layers: 1. TPO polymer base. 2. polyester-reinforced fabric center (scrim). 3.thermoplastic poly