FIBEROCK Aqua-Tough tile backer board is a unique fiber-reinforced gypsum product that represents a new era in substrate performance for wet or dry areas as recognized within the Tile Council of North America Handbook and International Residential Code. This durable panel offers superior performance and tile bond in addition to an integral water-resistant core. Unlike traditional water-resistant gypsum board FIBEROCK Aqua-Tough tile backer board derives both strength and water-resistance from its uniform composition. Made of a uniquely engineered gypsum/cellulose-fiber combination it is strong water resistant and mold resistant scoring a 10 the highest possible rating on ASTM D 3273. With no paper face to delaminate tear or scratch it maintains its integrity even when wet. The backer board can be finished with ceramic tile or painted and has a 20 year limited warranty. It is environmentally friendly made from 95-percent recycled materials earning it Green Cross Certification from Scientific Certification Systems.