Single Ply Roofing

Single Ply Roofing

Single Ply membranes appeared in our area in the 1980’s. The first systems were comprised of synthetic rubber (EPDM) which was usually held in place by a gravel ballast. These were known as loose laid systems; but because of their heavy weight and difficulties in locating leaks, they have lost popularity. Mechanically fastened TPO & PVC systems are the most widely used today. Various width sheets are fastened at laps to the deck and then the laps are usually welded by the use of a hot air machine. Fully adhered TPO & PVC systems are used less often, but are ideal over certain decks such as concrete, where mechanical fasteners are not practical.

Since single-ply systems have evolved, there have been a number of premature failures, which is a concern. We have seen several systems begin to fail after 10 years, which falls short of the twenty year minimum life expectancy we expect. However, there appears to be a number of systems which can perform very well over many years.

Watts & Associates Roofing
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