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FAQs
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Glossary
How long can roofs with vinyl membranes be expected to last?
The longevity of vinyl roof systems, much like all roof systems, is dependent on the design and installation of the systems. Longevity is also dependent on the formulation, reinforcing scrim and thickness of the membranes. Enhancements in each of these provide potential enhancements to the lifespan of the vinyl roof system. There are numerous examples of vinyl roof systems which have been in successful service in excess of 25 years.
What are the maintenance requirements for vinyl roofs?
Vinyl roofs are inherently low in maintenance requirements. They should be inspected twice per year or after any significant weather event. This inspection should include checking the sealants and caulkings, as well as ensuring that the membrane is still attached as originally intended. Any excessive environmental pollutant accumulations (e.g., stack emissions) should be removed. Also, all drains should be checked and cleaned.
How can vinyl roofs be repaired, if required?
Vinyl roofs are thermoplastic materials and, as such, are weldable throughout the life of the roof. Before performing repairs, surface contaminants should be removed with a mild detergent and water. If there are excess pollutants, they can be removed with a light solvent wipe, although caution should always be used with the use of solvents. A repair can then be performed by hot air welding a repair patch with a 2-inch overlap in each direction on the material to be repaired. The patch will not negatively affect the integrity of the membrane, as it is a thermoplastic; the hot air welded material is fused into place for the life of the roof.
What is the difference between vinyl and TPO membranes?
The difference starts with the basic formulations. Vinyl or polyvinyl chloride (PVC) contains a base PVC resin that is modified with plasticizers and UV stabilizers, and reinforced with fiberglass non-woven mats or polyester woven scrims, for use as a flexible roofing membrane. Thermoplastic olefin (TPO) is similar in construction but starts with a polyethylene or polypropylene-based resin. Both products can be welded together with hot air welding equipment and come in a variety of colors and thicknesses.
Vinyl roofs are inherently fire resistant and have a broader range of fire ratings over common substrates. Vinyl roofing has a greater resistance to animal fats and certain greases.
Vinyl has been sold as commercial roofing products for more than 40 years. TPO is a newer product with about 10 years' experience in commercial roofing. TPO membrane formulations are still evolving, especially regarding fire retardant additives. Therefore, vinyl roofing has a longer proven track record of performance.
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