TPO (Thermoplastic Olefin or Polyolefin)
TPO (Thermoplastic Olefin or Polyolefin) membranes are single-ply roof membranes constructed from ethylene propylene rubber. They are designed to combine the durability of rubber with the proven performance of hot-air welded seams. They have been tested as having excellent resistance to ozone, are algae-resistant, environmentally friendly and safe to install.
• The material’s manufacturers are so confident in properly welded seams that the material is sometimes advertised as a monolithic (seamless) roof. Seam strengths are reportedly 3 to 4 times those of EPDM’s adhesive and tape seams.
• TPO is highly resistant to tears, impacts, and punctures with good flexibility to allow for building movement.
• TPO membranes are installed fully adhered, mechanically attached, or ballasted.
• Fully adhered means that the roof is “glued” to the substrate using a special adhesive. What actually happens is the glue creates a chemical bond with the membrane.
• Ballasted simply means the membrane is loose laid over the top of the roof, sealed at all penetrations and around the perimeter, and then a ballast is put on it to hold it in place.
• Mechanically attached membranes are those that use some type of special screw-type fastener to secure it. The type of fastener will depend on the type of substrate but all fasteners are generally screw-type fasteners.