San Antonio Roofing: Article About Roofing Strategies For A Cooler Home
Homeowners in Texas understand the need to find effective ways to cool their homes. Many people address window treatments and shading on the property but ignore the roof. San Antonio roofing experts can help increase energy efficiency in hot climates by employing a cool roof strategy or by using radiant barrier technology.
By using a cool roof strategy, a homeowner can save on air conditioning costs. A cool roof is designed to reflect more sunlight than traditional roofs. When the light is reflected, less heat is absorbed by the roof. There are three ways to build a cool roof. Roofers can use cool roof materials that are reflective, such as thermoplastic membranes or stainless steel. Reflective membranes can reflect in excess of 80 percent of the sun's rays and emit up to 70 percent of the solar heat a roof normally absorbs. Stainless steel roofs are even more energy efficient, reflecting almost all of the sun's rays. Another way to make a roof cool is by applying a solar reflective coating. The Cool Roofs Ratings Council has a listing of over 500 coatings and their ratings for reflectivity. The third way to have a cool roof is by installing a green or living roof. A green roof is partially or completely covered with vegetation such as grass, a medium for growth and a waterproof membrane.
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By providing a thermal mass that reduces heat absorption, the building is kept cooler. Living roofs are not as reflective as the other methods, but the evaporation and respiration of the plants provides a natural cooling to the roof and building below. Regardless of the type of cool roof, this strategy is effective in climates where there are more days requiring air conditioning than heating.
Another means of increasing energy efficiency is by using radiant barrier insulation. Radiant barrier insulation blocks or reflects heat transfer to prevent heat from crossing a boundary between two areas of differing temperatures. The barrier can be installed in several ways. It can be applied over the roof sheathing and directly under the metal or tile roof or laminated directly to the roof sheathing. It can also be applied as a facing in the attic by stapling it to the underside of the rafters. The final method is to lay the barrier over the top of the insulation in the attic.
Radiant barriers and cool roof strategies are both effective to reduce the amount of radiant heat the gets into the home.