Kerdi-Band is a waterproofing strip for sealing butt joints and floor/wall connections with Kerdi and Ditra membranes. It is installed with unmodified thinset to ensure a fully water-tight seal to prevent leaks. The 4 mil thickness of the Kerdi-Band helps prevent build up under the tile. Roll is 5 in. wide and 33 ft. long Thickness is 4 mil Prevents build-up beneath the tile Ensures a fully water-tight seal preventing leaks and mold growth Adheres tightly to inside and outside corners without rounding at surface transitions