Cool roof coatings have gained popularity as an effective way to lower roof temperatures and save on home cooling costs. Some states even offer rebates to homeowners willing to apply the white, solar-reflective coating to the roofs of their homes. If you have an asphalt-shingled roof, however, applying a cool coat to it could be a very bad idea. Read on to learn what a cool coat could do to your asphalt shingle roof and how you can get the benefits of a cool roof without wasting money on asphalt-damaging cool coating.

The Effects Of Applying Cool Coating To Asphalt Shingles

Your asphalt shingle roof is not waterproof. Its ability to stay dry comes from the fact that it is designed to shed water quickly. When a shingle roof is laid on a home, each shingle is strategically placed to slightly overlap the shingle below it, thus allowing rainwater to freely flow from the roof. Cool roof coating, being of a thick, liquid consistency, can gather in the crevices between the shingles and interfere with your roof's water-shedding ability. Furthermore, if it is a water-based cool coating, some of the water in the solution can soak into your shingles, thus softening and weakening them.

Another problem comes from the recommended roof preparation steps for cool coating. The substance has to be applied to a clean surface, and many roof cool coating manufacturers recommend achieving a clean roof by thoroughly pressure washing it. If you take a pressure washer to asphalt shingles, though, the blasting water could get below the shingles and push them upward, loosening them or dislodging them from your roof altogether. Once this happens, you face a leak if you don't get those shingles repaired or replaced promptly. 

Getting A Cool Roof Without The Damage

Asphalt shingle roofs are simply not designed to work with cool roof coatings. If you have an asphalt roof and you want a cool roof, you'll need to have cool shingles installed on your roof. Cool shingles are constructed much like regular shingles, but they have highly-reflective granules mixed right in with the asphalt used to create them. The granules are engineered using infrared reflective coatings, so they bounce sunlight away from your roof instead of absorbing it.

Cool shingles cost between 20 and 40 percent more than regular asphalt shingles, but they don't require any special underlayment or installation procedures. Depending on where you live you'll save between 7 and 15 percent on home cooling costs after your new cool shingles are installed, and you may be eligible for a consumer efficiency tax credit to help you pay for installation. You can choose to have your current shingles removed and replaced with cool shingles or, as long as your home's frame is solid and your roof sheathing is intact, you can save on shingle disposal costs by having the cool shingles laid directly on top of your current shingles.

Energy Star-qualified cool roof shingles will keep your roof at a more constant temperature, thus reducing thermal shock and possibly extending the potential life of your new roof. As another benefit, while cool roof coatings are specifically white in color, cool shingles can be purchased in a variety of colors, so you can choose singles that accentuate the appearance of your house. 

If you have an asphalt shingle roof and you want it to be cool, do not apply a cool roof coating; doing so could potentially damage your roof and be a big waste of money. Instead, contact a roofing company, such as Allen Roofing & Construction Inc, and ask to see their colorful selection of cool asphalt shingle samples. 

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