"Spray-in foam insulation expands to fill voids and cracks to form an almost airtight barrier. When applied, it can expand to 100 times its volume to effectively seal cracks and crevices. The material's ability to eliminate air infiltration is its biggest advantage. So there you have it, the three types of blown-in insulation you can have for your home. If you've had enough of the energy efficiency problems your old attic insulation gives you, then talk to an Alexandria, VA roofing contractor like Northern Virginia Roofing Company about having one of these better insulation types installed."
http://www.nvroofs.com/info-articles/advancements-in-alexandria-roofing-three-types-of-blown-in-insulation-you-should-know-about/
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