Contractors are careful on the roof, but accidents can happen. Heavy, sharp tools can get dropped. Stones, loose screws, or gravel can get stepped on and driven into the membrane. These things can happen during roof installation or when air-handling equipment, etc., gets installed or is worked on during routine maintenance. Some of these accidents can result in a puncture of the roof membrane. GAF set out to compare the two popular heat-weldable membranes, TPO and PVC, together with a range of substrates. So, which roofing materials will give you less worry about punctures? GAF’s research uncovered the answers. Read More . . .