Over the years, I’ve installed quite a few low-slope EPDM rubber roofs with good results. But the adhesive is messy stuff to work with, and it’s difficult to apply when the temperature falls below 45°F or so. So when I knew I’d be installing membrane roofing as part of a recent porch project, I decided to try TPO roofing instead, which can be heat-welded without any adhesive.TPO BasicsTPO stands for thermoplastic polyolefin. It’s a fabric-reinforced plastic that’s much tougher and more resistant to punctures than EPDM. The company I worked with, Flex Roofing Systems (flexroofingsystems.com), offers the material in white,...

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