Schluter KERDI Membrane
|PROFILE OF INNOVATION
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 & Schluter®-DITRA-XL
|Using a thin-set mortar that is suitable for the substrate, apply the thin-set
mortar (mixed to a fairly fluid consistency, but still able to hold a notch) using a 1/4" x 3/16" V-notched trowel,
5/16" x 5/16" V-notched trowel, or the DITRA-TROWEL,
which features an 11/64" x 11/64" square-notched design.
||Apply DITRA or DITRA-XL to the floor, fleece side down. Solidly embed the matting
into the bonding mortar using a float or screed trowel(please observe the open time of the bonding mortar).
||Lift up a corner of the matting to check coverage. Proper installation results in
full contact between the fleece webbing and the thin-set mortar. Simply abut end and side sections of adjacent sheets.
Note: Coverage may vary with mortar consistency, angle at which the trowel is held, substrate flatness, etc.
If full coverage is not achieved, remove and reapply, making sure to verify proper mortar consistency and application.
In some cases it may be beneficial to use a trowel with larger notches, such as a 1/4" x 1/4" square-notched trowel
||Tile can be installed over DITRA and DITRA-XL immediately; no need to wait for
the mortar to cure. Fill the cut-back cavities with unmodified thin-set mortar and comb additional mortar over the
matting using a trowel that is appropriate for the size of the tile. Solidly embed the tiles in the setting material.
Periodically remove and check a tile to ensure that full coverage is being attained. Back-buttering is a useful way
to help ensure proper coverage, particularly when installing large format tiles (e.g., 12" x 12" and larger).
|ESTIMATED THIN-SET COVERAGE
To bond DITRA and DITRA-XL to the substrate: Use one 50 lb. bag of mortar per 150 - 200 sq.ft.
To bond the tile to the DITRA, using a 1/4" x 3/8" square- or U-notched trowel: Use one 50 lb
bag of mortar per 40 - 50 sq.ft.
To bond the tile to the DITRA-XL, using a 1/4" x 3/8" square- or U-notched trowel: Use one 50 lb
bag of mortar per 35 - 45 sq.ft.
|The following steps are for waterproofing only:
|At the joints, fill the cut-back cavities with unmodified thin-set mortar,
approximately 8" wide, centered over the joint.
||Comb additional unmodified thin-set mortar over the joint using a
1/4" x 3/16" V-notched trowel or the Schluter®-
KERDI-TROWEL, which features a 1/8" x 1/8"
square-notched design. Using the flat side of the trowel, firmly press the 5"-wide
Schluter®-KERDI-BAND into the mortar to ensure
100% coverage and to remove excess mortar and air pockets.
||At all wall junctions, apply a 10"-wide strip of
KERDI-BAND as described in steps 1-3, centered
where the wall and floor meet.
- KERDI-BAND must lap DITRA and DITRA-XL
at seams and at floor/wall transitions by a minimum of 2" in order to maintain waterproof integrity.
- 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).
Purchase Ditra Membrane by the foot
- 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
- 5/16" thick - creates an even transition between typical 5/16"-thick tile and 3/4"-thick hardwood
- 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.