![]() Graveline says, “One might assume the back, minimally reflective surfaces would reduce heating energy loads in the winter, but the answer is not quite as simple as it might first appear.” While the energy benefits of reflective roofs in southern climates have come to be broadly accepted and recognized, the energy benefits are also present for buildings in cold northern climates. Obviously, the precise cost savings for a particular building depends on a number of factors, including climate, amount and type of roof insulation, building use patterns, energy prices, and the efficiency of the HVAC system. In many cases, cool roofs cost about the same as non-cool alternatives. A significant side benefit is that decreasing the roof temperature also extends the service life of the roof membrane. This leads to decreased air conditioning needs, reduced energy bills, and improved comfort for occupants. So, in hot summer months, when a traditional dark roof can reach temperatures higher than 150☏, a light-colored cool roof under the same conditions would stay more than 50☏ cooler. 70, meaning they reflect at least 70% of the sun’s energy. Most cool roofs have a reflectance rating of at least. Most dark roofs absorb 90% or more of the incoming solar energy. The single factor driving the growth of cool roofing over the past decade is energy savings. ![]() ![]() Single-ply membranes can be adhered or mechanically fastened, and spray- or roller-applied cool roof coatings are available as well. They work on virtually any type of low-slope roof and are available in a wide array of formulations to deal with the various substrates, pitches, and installation temperatures encountered on the jobsite. They also quickly release the energy that is absorbed.Ĭool roofs can be retrofitted on most existing structures or installed as new construction. This claim, made by Stanley Graveline, VP of technical services at Sika’s roofing division, has been backed by several years-long scientific tests.Ĭool roofs are roofs that are designed to maintain a lower roof temperature than traditional roofs, typically by reflecting a portion of the sun’s rays back into the air rather than absorbing all that energy into the roof structure as heat.
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