SINGLE PLY Single-ply membranes are factory-manufactured sheet membranes. They generally are categorized as either thermoplastic or thermoset. Single-ply membranes can be installed fully adhered, mechanically attached or held down with ballast. Most single-ply roof systems do not receive surfacings. Types of single ply membrane: TPO, PVC, EPDM.

MODIFIED BITUMEN Polymer-modified bitumen or modified bitumen sheet membranes have been in use in the U.S. since the mid 1970s. Polymer-modified roof membranes are composed of reinforcing fabrics that serve as carriers for the hot polymer-modified bitumen as it is manufactured into a roll material. MB roof system membranes are composed of multiple layers, much like BUR membranes. MB roof systems typically are installed as a two-ply system and almost always are fully adhered. There are two types of MB roofing membranes: APP and SBS.

SHEET METAL Sheet metal roofing refers to flat sheets of metal that can be used to sheath commercial roofing systems. Corrugated metal roofing is rippled sheets of metal.  This type of metal is extremely durable. Standing seam metal roofs are made up of interlocking metal panels. Standing seam metal roofs are very durable, puncture resistant, and can usually withstand very high winds.

BUILT UP ROOFING Built-Up roofing systems, are highly reliable waterproof membranes.  Built-up roofing is fabricated with layers of bitumen, alternating with plies of reinforcing felts.  Finish surface with a layer of gravel or slag in a heavy coat of asphalt or coal-tar pitch or finished with a cap sheet,  generally used on flat or low-pitched roofs.