Elastilon self-adhesive underlayment allows build-ers to install a floating hardwood floor on most substrates including above- and below-grade concrete. Eliminating the need for nails or glue, the product has an adhesive-topped surface that peels back so flooring can be slipped into position. It cuts installation time up to 70 percent and provides noise absorption. Cost: $1.89 to $1.99 per square foot. Elastilon USA. 877-526-9663. www.elastilonusa.com.