Thermo plastic Polyolefin

An energy efficient solution for an industrial scale

Thermo plastic Pololefin (TPO) is a modified form of PVC that is extremely strong, as its heat-welded seams form a permanent, watertight bond that is stronger than the membrane itself. PVC resin is modified with plasticisers and UV stabilisers, and reinforced with fibreglass non-woven mats or polyester woven scrims, for use as a flexible roofing membrane. PVC is, however, subject to plasticiser migration (a process by which the plasticisers migrate out of the sheet causing it to become brittle). Thus a thicker membrane has a larger reservoir of plasticiser to maintain flexibility over its lifespan.

This roofing material can be fully adhered, mechanically fastened, or ballasted. TPO seam strengths are reported to be three to four times higher than EPDM roofing systems. This is a popular choice for “Green” building. It is available in white, grey, and black. Using white roof material helps reduce the “heat island effect” and solar heat gain in the building. However, TPO has changed formulations over the years and each manufacturer has its own mix of “polyolefins” (plastics.) This means that TPO remains largely unproven in real world applications as its current formulation exists today.