"Each roofing slat is coated with layers of protective barriers which lock out moisture, water, and block harmful UV rays. The base begins with structural grade steel and then is sprayed with an alloy zinc coating. Then there is usually an acrylic primer, followed by a base coat, and bonding agent. Finally the steel is sprayed with an outer coating that creates architectural appeal. Another notable feature of metal roofing is its good insulating value both in winter and summer, which significantly helps reduce homeowners' heating and cooling costs. True enough, tin roofs have been replaced with durable NH metal roofing as a home's protective barrier against undesirable weather conditions. Among many New Hampshire and Maine homeowners, Performance Roofing has become one of the trusted names in metal roofing installation."
http://www.portsmoutharearoofing.com/info-article/metal-roofing-in-nh-shows-why-its-on-top-of-the-list-among-homeowners/
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