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For use under ceramic, porcelain, or stone floor tile, UltraLayer is a 0.1-inch-thick sound-deadening underlayment that comes in 3 foot by 33.4 foot (100 square feet) rolls. To install, glue it to the subfloor using thinset mortar, roll it with a 75-pound roller, then install the tile on top using latex Portland cement mortar. Tile must be a minimum of 8 by 8 inches. Cost: $90 to $100 per roll. MP Global Products, 888.379.9695, quietwalk.com