Definition: Insulation Insulation is a category of materials used in homes and other buildings to help them retain heat. There are now many green types of insulation available. Two popular types of green insulation are cellulose insulation, which is made from recycled paper, and denim insulation, which is made from recycled jeans. "Entourage" star Adrien Grenier used UltraTouch denim insulation in his Brooklyn brownstone.
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