TPO Roofing Basics

TPO roofing is typically based on polypropylene and ethylene-propylene rubber. These two materials are polymerized together to produce TPO roofing membrane, which is flexible at low temperatures, resistant to ozone and algae and generally considered environmentally friendly and safe to install.

Often called a seamless roof system, a thermoplastic roofing system is highly resistant to tears, impacts and punctures. A TPO roof system is typically available in white, light gray and black with a thickness of 45 to 60 mils. Common width for TPO roofing is 6 to 6 1/2 feet.

History of the TPO Roof System

Thermoplastic products have been used in various applications since the 1980's. Since then, thermoplastics have continued to expand, formally being introduced to the roofing industry in 1989 as non-reinforced sheet. In 1993, non-reinforced thermoplastic roofing was replaced with membrane containing reinforcing fabric. Since that time, TPO single ply membrane roofing has experienced a surge in popularity and is now the fastest growing segment of the single ply roofing industry in the U.S

Thermoplastic Roofing Installation

A TPO roof system is either fully-adhered, mechanically-attached or ballasted to the base surface of the roof. When adhered, a special adhesive is used to chemically bond the thermoplastic membrane to the base. A ballasted system implies that the TPO membrane has been laid over the roof surface, sealed and around all penetrations and the perimeter and covered by a heavy layer of river rock. Mechanically attached thermoplastic roofing is attached to the base by a screw-type bolt.

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