Schluter Ditra Drain Membrane
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
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
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
Drainage and ventilation
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).
uncoupling through its geometric configuration, which allows for
in-plane movement that effectively neutralizes the differential movement
stresses between the substrate and the tile.
Schluter Item No.
5/32" - 4 mm
3' 3" x 33' = 108 ft2 (1 m x 10 m = 10 m2)
5/32" - 4 mm
3' 3" x 82' = 269 ft2 (1 m x 14 m = 25 m2)
Schluter Ditra Installation Handbook