Ditra 54 Sq. Ft. 3 Ft. 3 In. X 16 Ft. 5 In. X 1/8 In. Thick Uncoupling MembraneLightweight, easy to install and ready to tile over immediately Prevents cracking and delaminating of the tiled surface Provides waterproofing and vapor control Ditra is a polyethylene uncoupling underlayment with a grid Ditra 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.