Fixing ceramic tiles to SCHLÜTER®-DITRA on timber floors with UltraTile adhesive

Schlüter®-DITRA acts as an intermediate substrate system on floors, prior to the fixing of ceramic and natural stone tiles with UltraTile adhesive.

As an uncoupling system it is used on timber substrates such as wood-based sheets  and board where possible movement  at board junctions could otherwise lead to the floor tiles cracking. Schlüter®-DITRA  is also  designed for overlaying timber substrates  where a waterproofing system is required, in areas  such as  bathrooms, wetrooms and showers.

Installation of ceramic tiles to Schlüter®-DITRA on timber floors with UltraTile adhesive:

Ensure adequate underfloor ventilation.

Remove any existing floor coverings.  The timber floor construction should be load bearing, clean, dry and level.  Re-fix loose boards.  Additional bracing should be used if the floor flexes.

Dry lay the Schlüter®-DITRA and cut to fit before adhering  to the sub-floor.

Using a 3x3mm notched trowel, apply a layer of UltraTile ProFlex SP over the floorboards  to a sufficient depth  to secure  the fabric fleece  on the Schlüter®-DITRA underside of the matting.

Lay the matting into  the wet/tacky adhesive and press firmly into place, abutting all edges.  If a waterproofing system is required, the mat joints should be sealed with Schlüter®-KERDI-KEBA sealing band and the sealant adhesive Schlüter®-KERDI-COLL.

Select UltraTile ProFlexSP adhesive and apply into the mat surface to completely fill the dove-tailed square cavities.

Apply additional UltraTile ProFlex SP to the filled mat surface with a notched trowel that is appropriate to the size of tile being fixed, ensuring solid bedding of the tiling.  Please note that the minimum tile size where Schlüter®-DITRA is used should be 50x50mm.

UltraTile ProFlex SP is a single part, rapid set tile adhesive specially formulated to achieve enhanced adhesion and flexibility where slight movement or vibration can occur.

The adhesive’s unique qualities make it suitable for fixing glass, porcelain, mosaic and ceramic tiles.  It is available in grey in 20kg and 10kg sizes, and white in 20kg.

NOTE: Movement joints should be included at room perimeters or where tiling abuts fixed objects.  Tile surface movement joints should be incorporated  over any substrate change and in larger tiled areas, according to industry standards.

This information is intended as a guide only and should be used in conjunction with manufacturers’ current technical information and recommendations.

For further information, please call 01827 254402.


Head Office

Danny Morson Way
Birch Coppice Business Park
Dordon, Tamworth B78 1SE

UK Tel: +44 (0) 1827 254 400

Scotland & Ireland Office

Suite 1 E/F Liberty House
15 Cromarty Campus
Rosyth, Fife KY11 2YB

Scottish Tel: +44 (0) 141 260 9051
Irish Tel: +44 (0) 141 260 9053