Schluter®-DITRA-DRAIN is a drainage membrane designed for use within thin-bed ceramic and stone tile assemblies in exterior applications. It consists of a studded polyethylene sheet with a laminated polypropylene filter fabric. DITRA-DRAIN provides uncoupling and drainage for use in a variety of exterior applications, including exterior floors, patios, walkways, and balconies.

DITRA-DRAIN-STU is a self-adhesive tape designed to seam the cut edges of the DITRA-DRAIN membrane. The seaming tape provides a way to continue the filter fabric at the top of the membrane and allow for ventilation and drainage.



  • Permanently effective passive capillary drainage system for exterior floor assemblies
  • Nominal 5/32" (4 mm)-thickness minimizes tile assembly thickness

  • Installed in exterior areas into thin bed mortar over a sloped waterproofing assembly or other suitable proprietary waterproofing systems

  • Features a closed polyethylene foil with truncated conical studs and laminated filter webbing on one side
  • DITRA-DRAIN-STU is 3-1/2" (90 mm)-wide
  • Note: Use of KERDI under DITRA-DRAIN is optional. When the assembly is adjacent to a building, KERDI may be used for flashing