Elastomeric roof coatings are the surfacing component of the two-part spray polyurethane foam-based (SPF) roofs. For more information about the substrate for SPF roofing systems, visit our polyurea foam page. Elastomeric roof coatings are also commonly used on metal roofs.
Elastomeric roof coatings provide many benefits to the roofing systems they cover, including promoting energy efficiency and durability. They are also simple for a qualified roofing contractor to apply—elastomeric roof coatings are often spray applied, but the American Society for Testing and Materials (ASTM) says that hand and power rollers can be used as well. Your roofing contractor should be able to point you to the right application method for your facility’s roofing system.
Weatherproofing the substrate
Elastomeric roof coatings cover the substrate—either polyurea foam or metal, or sometimes even tar roofs—and protect it from the sun and harmful UV rays, as well as providing waterproofing and abrasion resistance. It forms a durable membrane unlikely to tear or leak. Elastomeric roof coatings additionally provide further fire resistance to the roofing systems it coats. The durability and strength of the roofing system means that you will probably spend less time repairing and replacing your roof, especially if applied correctly.It is important, however, to have your elastomeric roof coatings applied by experienced roofing contractors to ensure the quality and longevity of the overall roofing system.
Standards for elastomeric roof coatings
The National Roofing Contractors Association recommends that all elastomeric roof coatings meet the standards set by ASTM. One such standard, ASTM D6947, regulates coatings used in SPF roofing systems, such as elastomeric polymer coatings. To pass the benchmark set by ASTM, elastomeric roofing coatings must pass a series of tests measuring tear resistance, water absorption, and temperature resistance.These tests are designed to ensure the quality of elastomeric roofing coatings bearing the ASTM D6947 standard. A roofing contractor will be able to guide you toward coating manufacturers that adhere to this—and every other—ASTM standard pertaining to elastomeric coatings.