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Schluter Systems
Schluter DITRA Membrane

Schluter Systems

Schluter®-Systems develops products specifically for the tile industry to ensure that installations maintain integrity and durability. The Schluter product line includes tile trims, uncoupling membranes, floor heating systems, waterproof building panels, and shower systems.

For more detailed information on any of their products it is highly recommended to go to their Web Site to see all of what they offer and they have plenty of instructions and information.


Installing Schluter®-DITRA for Interior Floors
Ceramic or Stone Tile
Schluter Systems Areas of Application
  • Over any even and structurally sound substrate where waterproofing is desired.


  • Minimum 2" x 2" tile.


  • All seams in DITRA and DITRA-XL matting and floor/wall transitions must be sealed with KERDI-BAND using unmodified thin-set mortar. Note: KERDI-BAND must lap DITRA at seams and at floor/wall transitions by a minimum of 2" in order to maintain waterproof integrity.
Other Considerations
  • Seaming DITRA and DITRA-XL, including floor/wall connections, with KERDI-BAND may be appropriate in cases where a break in the water line of an ice maker or dishwasher can damage pre-existing moisture-sensitive substrates and underlayments. KERDI-BAND floor/wall connections are just as easily concealed with wood base as with tile. KERDI-BAND floor/wall connections in dishwasher alcoves are parged with thin-set mortar.

  • In some applications the vertical section of the floor/wall transition will not accept a bond to unmodified thin-set mortar. Connections to such elements can be achieved using Schluter®- KERDI-FIX or suitable trowel applied waterproofing materials, such as those that require atmospheric moisture to cure (e.g., urethane sealant).

  • KERDI-DRAIN may be used to provide drainage in DITRA and DITRA-XL applications. DITRA/DITRA-XL is sealed to the fleece-laminated KERDI-DRAIN bonding flange with a section of KERDI membrane using unmodified thin-set mortar. KERDI-FIX is used to seal the section of KERDI to the stainless steel KERDI-DRAIN bonding flange.
Concrete Subfloor
Schluter Systems Areas of Application
  • Over structurally sound and even exterior concrete on grade where positive drainage below slab is provided.
  • Young concrete (concrete cured less than 28 days).
  • Post-tensioned or pre-stressed concrete.
  • Cracked concrete.


  • Minimum 2" x 2" tile
  • Any cracks in concrete subfloor must exhibit in-plane movement only; thin-set tile assemblies, including those incorporating DITRA or DITRA-XL, cannot accommodate differential vertical displacement.
  • Slab to be structurally sound.
  • Slab/assembly must be sloped for complete surface drainage.
  • Gravel bed or other means of drainage must be provided below slab.
  • Slab to be free of waxy or oily films and curing compounds (when present, mechanical scarifying is necessary).
  • All seams in DITRA and DITRA-XL and floor/wall transitions must be sealed with Schluter®-KERDI-BAND using unmodified thin-set mortar.

Substrate Preparation

  • Sloping of the slab or assembly must be done prior to installing DITRA and DITRA-XL.

Movement Joints

  • DITRA and DITRA-XL do not eliminate the need for movement joints, including perimeter joints, within the tiled surface. Movement joints must be installed in accordance with industry standards and norms.

Step-by-Step Installation Instructions

Purchase Ditra Membrane by the foot

3'3" Wide

  Enter How Many Feet:

$6.96/lin. ft.

  • Only 1/8" thick - provides thinnest possible assembly without sacrificing performance.
  • Use DITRA for ceramic tile installations over single layer plywood or OSB subfloors on joists spaced up to 19.2" o.c.
Purchase Ditra XL Membrane by the foot

3'3" Wide

  Enter How Many Feet:

$7.12/lin. ft.

  • 5/16" thick - creates an even transition between typical 5/16"-thick tile and 3/4"-thick hardwood flooring.
  • Use DITRA-XL for ceramic tile installations over single layer plywood or OSB subfloors on joists spaced up to 24" o.c.
  • DITRA-XL is ideal for installations requiring greater movement accomodation, such as applications using natural stone tile, large-format tile, etc.

Various KERDI waterproofing accessories are available. Use KERDI-BAND to seal butt joints or corner joints. KERDI-KERECK pre-formed seamless inside and outside corners and KERDI-SEAL-PS for sealing around pipes or KERDI-SEAL-MV seals mixing valve protrusions, and KERDI-DRAIN Assemblies. KERDI-TROWEL also available for installation of thin-set mortar.

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