Single-ply membranes have become important players in the low-slope roofing market. Products such as EPDM and PVC have been used in the U.S. roofing industry since the late 1970s. TPO has been used as a roof membrane since 1991 and currently is the fastest-growing segment of the low-slope market, according to surveys conducted by NRCA and SPRI. Like all products, single-ply membranes have had their problems. However, they are considered dependable and competitive roof systems.
Many in the roofing industry believe fully adhered single-ply membrane roof systems are the best single-ply roof systems available. There are a number of reasons for this belief, including the following:
Review of NRCA's 2006-07 Low-slope Roofing Materials Guide, as well as membrane manufacturers' literature and Web sites, has revealed four manufacturers that produce self-adhering, or peel-and-stick, single-ply membrane products—three manufacture TPO membranes and one manufactures PVC membranes. General information about these products is shown in the figure.