Thermoplastic Polyolefin Olefin – This single ply membrane represents the largest current growth in the single ply roofing segment. The membrane is formulated from a blend of plastics and rubber embedded with an internal reinforcement resulting in a thin, flexible, membrane. TPO roof systems are heat welded at the seams and are most commonly white in appearance. The membrane’s outer surface has high reflectivity and low thermal absorption allowing it to achieve Energy Star Ratings. Installed typically as mechanically attached or fully adhered, it is available in several thicknesses.
This roof system consists of multiple plies of saturated felts, fabric, or mat installed on the roof into a continuous membrane that is adhered using alternating layers of bitumen (asphalt) and surfaced with aggregate, bituminous materials, coatings, or granule surfaced sheets. Commonly mistaken as a “tar” roof, this roof system has a long proven successful history and is one of the most resilient to punctures and leaks due to its thickness.
These roof systems are composed of polymer-modified roof membranes that are manufactured to include layers of polymer-modified asphalts embedded with fiber reinforcement. When installed, the rolls of the layered membranes are often set in hot asphalt on the roof by means similar to the installation of a built up roof system. The two types of polymers used to modify the asphalt include a rubberizing polymer known as SBS and a plasticizing polymer known as APP. Modified bituminous roof systems can also be installed using torch applications, cold adhesives and self adhering. They have excellent puncture resistance but are susceptible to damage from chemicals, oils, and solvents.
Ehylene Propylene Diene Monomer- EPDM is an elastomeric compound which is formed into a synthetic rubber sheet used as a single ply roofing membrane. The cured rubber membrane is most often black in color and can be ordered in different thicknesses and sheet widths. EPDM roof systems are seamed together using adhesives and tapes. They are commonly installed over decks using mechanical fasteners, glues, or ballasted with washed river stone.
Polyvinyl Chloride – a single ply membrane with a wide range of uses in residential, commercial, and industrial applications. One of the first single ply membranes, it has outstanding characteristics for resisting bacteria growth, chemical deterioration, fire resistance, and plant roof penetration. For these reasons, it is commonly used in garden roof assemblies and restaurant applications. It shares many of the characteristics of reflectivity and low thermal absorption as TPO membrane roof systems.
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