A relative newcomer to the field single ply roofing: TPO or Thermoplastic Polyolefin, has been around since the late 1980’s.
TPO membranes are produced by calendering with lamination, extrusion with lamination, or extrusion-coating techniques. TPO sheets are a blend of polypropylene and ethylene propylene polymers and usually are reinforced with polyester scrim. TPO sheets contain colorant, flame retardants, UV absorbents and other proprietary substances to achieve desired physical properties.
Early formulations of TPO had reports of accelerated decomposition of the membrane in areas where additional sunlight would reflect off a surface onto the TPO. However, many manufacturers insist that either their membrane never suffered from these issues or their formulation has been altered to alleviate the problems.
TPO Membranes are fastened in one of 3 ways:
Reflective Surface, Available in a variety of colors
Shorter Track Record than PVC or EPDM
“Thermoplastic Membranes.” Home. NRCA. Web. 3 Dec. 2014.
“DIMENSIONAL STABILITY AND REFLECTIVITY OF FIELD EXPOSED THERMOPLASTIC POLYOLEFIN (TPO) ROOF MEMBRANES.” NRC-CNRC. Web. 3 Dec. 2014.
Boss, Leo. “Overview of MRCA Advisory on TPO Roofing.” TPO Roofing. Web. 3 Dec. 2014.