Draper and Sons Construction provides TPO membrane roofs in Texas and Oklahoma. We are a quality roofing company that values character and integrity, while providing solutions that improve energy efficiency and extend the life of your roofing structure.
TPO membranes are single-ply roof membranes constructed from ethylene propylene rubber. They are designed to combine the durability of EPDM rubber with the proven performance of hot-air weldable seams. They have been tested as having excellent resistance to ozone, are algae-resistant, environmentally friendly and safe to install. 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 available in white, light gray, and black with thicknesses of either 45 mils (.045”), 60 mils (.060”), or 80 mils (.080”). The roll-width of the membrane depends on the manufacturer but they usually come in widths of six to six-and-a-half feet and are one-hundred feet in length.
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, Draper & Sons prefers this method when wind-load on roof is prohibitive.
- Mechanically-attached membranes are those that use some type of special screw-type fastener to secure it. The type of fastener used will depend on the type of substrate we are screwing into.
- 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. Ballast usually consists of smooth, round, river rock 2″ – 3″ in diameter and is applied at a rate of 1,000 to 1,200 pounds per roof square (100 sq. ft.). Sometimes concrete pavers are used in their place. These average 20 pounds per square foot.
Properly installed TPO roof systems have service lives ranging from 10 to 20 years, depending on the type of installation. Full removal of the existing roof, the amount of slope the roof has, weather conditions, as well as several other criteria contribute to the longevity of a roof’s service life. Typically, if you remove an old roof down to the deck before installing a new one, then the new roof will last longer. Also, the steeper the slope and the less severe the weather conditions, the longer a roof will last. High winds and hail can do any roof in rather quickly.
But remember, every roof, regardless of the type, is only as good as its initial installation.