Protect ceramic tile and natural stone installations from water, upward moisture migration and concrete cracks: inside or out. COMPOSEAL GOLD 40 mil bonds direct to substrate, then tile is thin-set above. COMPOSEAL WHITE GOLD 50 mil gives extra sound control of STC 60 and IIC 59. COMPOSEAL BLUE Shower Pan is for thick-bed jobs. Listed by Ceramic Tile Institute and all plumbing codes. Made in the USA! Compotite (800) 221-1056