Single Ply Roofing Systems
Single ply roofing, is one layer of material. Several single ply products exist and they are typically labeled with the initials of their principal chemical compound.
EPDM is a rubber membrane made from thylene-propylene-diene-monomer. EPDM has been used in commercial roofing for almost a half a century and continues to be a material of choice due to its long life cycle and installation versatility.
TPO is the acronym for thermo-plastic polyolefin or Thermal Polymer Olefin. TPO is one of the lightest, most recyclable materials on the market. With a built-in, Ultra Violet protection, it is also one of the most weather-resistant materials on the market.
Modified Bitumen Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures.
Architectural Sheet Metal
Architectural Sheet Metal is a specialized type of metal roofing, typically involving steep slopes. These roofs feature custom fabricated sheet metal flashing and trim.
Shingles
http://www.gaf.com/Roofing/Residential/Products/Shingles