Schluter®-DITRA-DRAIN/-STU

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, such as KERDI 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
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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, such as KERDI 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
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Schluter<sup class='regsign'>®</sup>-DITRA-DRAIN/-STU

Schluter®-DITRA-DRAIN/-STU

Drainage membrane for thin-bed tile assemblies in exterior applications (5/32” [4 mm]-thickness)
Schluter®-DITRA-DRAIN/-STU
Schluter®-DITRA-DRAIN/-STU
Schluter®-DITRA-DRAIN/-STU
Schluter®-DITRA-DRAIN/-STU
Schluter®-DITRA-DRAIN/-STU

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Schluter®-DITRA-DRAIN is a drainage membrane designed for use within thin-bed ceramic and stone tile assemblies in exterior applications. DITRA-DRAIN is typically installed over the Schluter®-KERDI bonded waterproofing membrane. If the substrate does not require a waterproofing assembly (e.g., drained mortar bed), DITRA-DRAIN may be adhered directly to the substrate. DITRA-DRAIN consists of a studded polyethylene sheet with a laminated polypropylene filter fabric. Some of these studs are approximately 3/32" (2 mm) high inverted truncated pyramids, which form square undercut chambers on the underside. These studs facilitate the mechanical anchoring of the DITRA-DRAIN to the substrate with thin-set mortar. The remaining studs are approximately 5/32" (4 mm) high truncated cones, to which the filter fabric is laminated. These studs support the tile covering and effectively distribute loads to the substrate. Tile is installed over DITRA-DRAIN using the thin-bed method in such a way that the mortar is mechanically anchored in the filter fabric.

Drainage and ventilation

The free space between the filter fabric and polyethylene sheet provides ventilation for the tile bond coat to enable faster drying after water exposure compared to other thin-bed tile assemblies. The continuous free space also ensures water that drains through the ventilation layer cannot seep back into the tile covering (capillary passive drainage).

1. The substrate must be clean, even, and load bearing. Repairs of uneven spots or adjustments in height and slope must be performed before installing the waterproofing membrane and DITRA-DRAIN.

2. Using a thin-set mortar that is suitable for the substrate, apply the thin-set mortar using a 1/4" x 1/4" (6 x 6 mm) square-notched trowel. Unmodified thin-set mortar meeting the requirements of ANSI A118.1 is required for applications over concrete, mortar beds and the KERDI bonded waterproofing membrane.

3. Apply DITRA-DRAIN to the floor, fleece side up. Solidly embed the matting into the bonding mortar using a float or a screed trowel. The inverted truncated pyramid shaped chambers must be filled with mortar after installation. Observe the curing times of all materials. It is best to align DITRA-DRAIN with light tension at the time of embedding the material. The individual sheets are installed with tightly abutting joints. The lateral fleece edge overlaps the joints, while the DITRA-DRAIN-STU self-adhesive joint sealing tape is available for cut edges without fleece overlap.

4. It is recommended to use walking boards, particularly where materials are transported, to protect the installed DITRA-DRAIN mat from damage or to prevent it from peeling off the substrate. Protective measures may also be required if the material is exposed to direct sunlight or precipitation in outdoor areas.

5. The tile can be installed over DITRA-DRAIN immediately. Apply unmodified thin-set mortar meeting the requirements of ANSI A118.1 to the matting using a trowel that is appropriate for the size of the tile. Solidly embed the tiles in the setting material. Depending on the tile format and substrate conditions, back-buttering may be required to achieve full coverage. Periodically remove and check a tile to ensure that full coverage is being attained.

Note: Schluter®-Systems recommends the use of Schluter®-BARA and DILEX profiles for edges, movement joints and wall connections.

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