MP Global Products’ UltraLayer is an underlayment engineered to deliver acoustical and insulating performance under ceramic and porcelain tile, as well as most natural stone. The product, which adds an R-value of 0.42 to the floor assembly, features randomly air-laid filaments to create a capillary effect to cushion the floor. The underlayment is certified by SCS Global Services to contain 100 percent postindustrial/pre-consumer fibers and carries SCS Indoor Advantage Gold certification. The 0.1-inch thick underlayment is available in 100-square-foot rolls.