TPO polymers are blends or alloys of EBR (polypropylene plastic or polypropylene and ethylene propylene rubber) and EPDM (ethylene propylene diene terpolymer rubber). Other additives are included in the mixture before it is formed into a roofing membrane. The membrane is attached to the roof board with fasteners. When combined with several other elements (like a weathering package, fire retardants, and insulation), the TPO membrane becomes a part of an entire roofing system.
TPO has gained industry-wide acceptance and respect by providing immediate and long-term roofing solutions. TPO is a sustainable roofing product that has proven to stand the test of time. TPO’s overall system performance include:
- Cyclical membrane fatigue resistance
- High resistance to ozone, weathering and abrasion
- Flexibility in low temperatures
- Thermal shock durability
TPO is incredibly popular because of its strength, ease of installation, and longevity. It can be heat-welded during installation due to the material’s thermoplasticity, which is a huge advantage since seams are usually the weakest part of a roof. In fact, TPO seams are said to be 3-4 times stronger than EPDM systems and 6 times stronger than systems that use glue seams or tape systems! They are resistant to chemicals, do well in high heat, are flexible in cold temperatures, and are generally quite affordable. With proper installation and maintenance, TPO systems can last 10-20 years. Finally, if it is important to you that your roof is environmentally-friendly, you have no need to fear TPO!
No plasticizers are involved in TPO roofing systems, they don’t degrade under UV radiation, and they come in white (which reflects heat, helping the building stay cool). Plus, they can be made from some recycled materials! TPO is the perfect choice for your “green” building.Like all roofing systems, however, TPO does have some cons. Most of its shortcomings revolve around the fact that it is still so new. It doesn’t have the time-tested, reliable reputation that some other roofing systems can flaunt. Also, remember that the strength of any roof (TPO especially) depends greatly on the quality of installation. If you choose a reliable roofing contractor and take care of your roof with yearly maintenance checks, you shouldn’t have any problems with a TPO roofing system.