Drywall incorporates a layer of Aerogel insulating gel to provide an insulation R-value of up to 4.1, compared to 0.5 for typical gypsum board. ThermaRock XI can reduce energy costs by up to 30%, according to the maker. The product is available in a gypsum version for use on wood or steel studs or over existing drywall, and a magnesium oxide version for use on masonry or CMUs. Boards are available in ½- and 5/8-inch thickness and in three sizes: 4x8, 4x9, and 4x10 feet.
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