110sq ft roll, never used new in box Ordered but didn’t end up needing it Ditra-XL is an uncoupling membrane designed for ceramic and stone tile installations on floors. It provides uncoupling to prevent cracked tile and grout. It is made of polyethylene creating a waterproofing layer protecting the substrate. Ditra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. Ditra-XL is 5/16 in. thick which allows for even transitions between tile and 3/4 in. hardwood flooring. Uncoupling membrane for tiled floor applications Prevents cracked tile and grout and provides waterproofing Ditra-XL is 5/16 in. thick and is designed for ceramic and stone tile Install over a wide range of substrates, including plywood/OSB, concrete, gypsum, heated floors, etc. Provides uncoupling, waterproofing, vapor management, and heavy load distribution