Schluter-Ditra XL 5/16" Underlayment 175sqft Roll by Schluter DITRA XL Uncoupling Membrane 3' 3" x 53' 3" = 175 sq ft Eliminates the major cause of cracking and delaminating of tiled surfaces Features a grid structure of square cutback cavities and an anchoring fleece laminated to the underside Provides uncoupling, waterproofing, vapor management and heavy load distribution to ensure the durability and integrity of tile installations DITRA-XL is 5/16" thick, which permits even transitions between tile and 3/4" thick hardwood flooring