Thermoplastic Polyolefin (TPO) is a synthetic rubber popular flat roof because of its natural ability to deflect UV rays. If you have ever seen a bright white roof, then chances are you’ve also seen the results of TPO roofing. It’s one of the most common roof types used by large commercial facilities and offers some of the best energy savings for a single-ply membrane roofing option. What’s important to know is that TPO Roofing is a single-ply thermoplastic membrane. This means there are no multiple layers and is instead installed in a single membrane application.