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Thermoplastic Polyolefin (TPO) is a single-ply membrane made from a polymerized combination of polypropylene and ethylene-propylene rubber that can be attached to a roof with adhesive or with mechanical fasteners. 

TPO a low-cost choice for flat and low-slope roofs, and the exposed surface is usually a highly reflective white, which makes TPO more suitable for hot, sunny climates.

TPO is a fairly new roofing material when compared with other roof systems. The TPO industry is still experimenting with this membrane.

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