FiberBacker by MP Global Products L.L.C. recently certified as Indoor Advantage Gold by Scientific Certification Systems (SCS), is an eco-friendly underlayment for ceramic tile, porcelain or natural stone floors. “FiberBacker smoothes out minor subfloor imperfections, insulates the transfer of noise between floors and, when used with ceramic flooring, suppresses lateral cracks up to 1/4” from transferring from the subfloor to the tile above,” the company says.