Flat Roofing

There are two main options available: TPO (occassionally gets voids in seams) and PVC (extremely reliable against leaks, same cost). There are a few honorable mentions such as EPDM (glued seams) and the historic built-up roofs (layers of hot tar and felt) and tar and gravel roofs (mostly phased out due to fire risks during installation).

1. PVC (Polyvinyl Chloride)

Like the plastic pipes, but with plasticizer to make it soft and weldable, this roof membranes stands at the top of all of them. Expect 20–30 years of life out of a properly-installed system. NDL (no-dollar limit) warranties are available as an added option from the manufacturer, for both residential and commercial projects. Rolls of 3' and 6' width are typically fastened with large biting circular plates and screws, then lapped over and welded with tacks and two full 1" passes (first and second pass) with separate heat gun holding procedures.

2. TPO (Thermoplastic Polyolefin)

While architects bizarrely still spec this out more frequently than PVC, it is not recommended due to the unreliability of the seams. This material is tough, harder to weld, springs voids after initial probe tests say it is good, and is a nightmare to weld to once a film of weathering sets in after a week or two (even using heavy degreaser or acetone does very little).

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