Reduce impact sound perception while giving a durable tiled surface with SCHLÜTER®-DITRA-SOUND and UltraTile adhesive

Schlüter®-DITRA-SOUND is an acoustic floor system that not only reduces noise, but actually protects the tiled surface, overcoming one of the major problems of tiling onto acoustic floors.

While reducing the impact sound of floor constructions (test values according to BS EN 140-8), Schlüter®-DITRA-SOUND was also specially designed to ensure that the tiled surface is highly durable, bearing loads up to 5kN/m².  It is a bonded impact sound insulation for tile covering, made of a heavy polyethylene mat, which has an anchoring fleece laminated on both sides to bond with UltraTile’s ProFlex SP.

At only 3.5mm thick, Schlüter®-DITRA-SOUND also gives a low construction height.

Installation of ceramic tiles to Schlüter®-DITRA-SOUND with UltraTile adhesive:

In order to install Schlüter®-DITRA-SOUND correctly, the substrate must be level, ready to bear weight and free of all substances that may weaken the bond.  Any levelling must be completed prior to the installation.

Dry lay individual courses of Schlüter®-DITRA-SOUND making required cuts, ensuring the joints are tightly abutted.  Apply UltraTile ProFlex SP thin-bed adhesive over the clean, load bearing substrate with a notched trowel (recommended size 3x3mm or 4x4mm).

Dry lay individual courses of Schlüter®-DITRA-SOUND making required cuts, ensuring the joints are tightly abutted.  Apply UltraTile ProFlex SP thin-bed adhesive over the clean, load bearing substrate with a notched trowel (recommended size 3x3mm or 4x4mm).

Lay Schlüter®-DITRA-SOUND mat into wet UltraTile ProFlex SP adhesive, ensuring joints are tightly abutted.  Use a float or roller to press Schlüter®-DITRA-SOUND into the adhesive.

Cut the edge strip Schlüter®-DITRA-SOUND-RSK with a knife (making sure that the tile covering has no direct contact with the wall or any upright construction fixtures after installation).

To avoid sound bridges, cover all joints with the self-adhesive joint covering, Schlüter®-DITRA-SOUND-KB.  It is important to protect any installed Schlüter®-DITRA-SOUND by overlaying walking boards while work continues and prior to tiling.  This will prevent damage to the boards and de-bond.  Use Schlüter®-DILEX profiles for neat floor to wall transitions.

The tiles may be installed in the normal way with UltraTile ProFlex SP adhesive immediately after the installation of Schlüter®-DITRA-SOUND.


The impact sound reduction of 13dB achieved by Schlüter®-DITRA SOUND means that the impact sound perception is cut by more than half.

The heavy polyethylene material absorbs much of the impact sound created by walking and substantially reduces the drum roll effect of sound being reflected off hard surfaces.  This makes it ideally suited both for new and refurbishment projects.

As well as providing impact sound insulation, Schlüter®-DITRA SOUND protects the tiled surface by bridging cracks in the substrate which are not expected to widen significantly, ensuring that those cracks are not transferred to the tiles.  As the material is a heavy matting that cannot be compressed, it is suitable for applications of up to 5kN/m².

For applications where the substrate needs to be protected from moisture ingress, eg. bathrooms, Schlüter®-DITRA-SOUND can be combined with Schlüter®-KERDI and Schlüter®-KERDI-COLL to create a bonded waterproofing assembly.

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 and10kg sizes, and white in 20kg.

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