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Schluter DITRA SOUND Noise Reducing Under Tile Matting

£11.08£13.14 (inc VAT)



Schluter DITRA SOUND Noise Reducing Under Tile Matting is a bonded impact sound insulation for tile coverings, made of a heavy polyethylene mat, which has an anchoring fleece laminated on both sides to bond with the tile adhesive. Each mat measures 550 x 750mm and covers 0.41m².

The transmission of noises caused by footsteps or dropped objects to adjoining or underlying rooms is referred to as impact sound transmission. The floor/ceiling structure absorbs the structure borne noise and transmits the resulting impact sound in the form of airborne noise. The human ear perceives impact sound that is muffled by 10 dB as airborne noise which is reduced by 50%. Impact sound (e.g. the noise generated by hard shoes) is also reflected back into the room. This effect is multiplied in the case of light constructions and hard surfaces, leading to the so called drum roll effect. It can be completely eliminated by the high density of Schluter DITRA SOUND matting.

Summary of functions:

a) Sound insulation / structural noise insulation

In addition, the heavy duty mat material absorbs structural noises, e.g. those caused by footsteps, and helps reduce the drum effect. The low assembly height of approx. 3.5 mm and the excellent sound insulation values of Schluter DITRA SOUND make it an ideal choice for renovation and refurbishment projects in buildings as well as new construction projects.

b) Crack-bridging

Cracks that are only expected to widen slightly without height displacement may be covered with Schluter DITRA SOUND to prevent cracks in the substrate from continuing into the tile covering. If necessary, add an insert to prevent vertical height displacement.

c) Load distribution (load induction)

Schluter DITRA SOUND is a compression-resistant heavy duty mat that makes tile coverings installed on Schluter DITRA SOUND especially durable. The tiles for the corresponding application area must be sufficiently thick and have adequate compressive stability to withstand high traffic loads (max. 5 kN/m², e.g. in commercial areas). Carefully ensure that tiles in high-stress areas are solidly embedded in the tile adhesive. The impact of hard objects must be avoided on ceramic coverings. Tile dimensions should be at least 5 x 5 cm with a thickness of at least 5.5 mm.

What this product is made from:

Schluter DITRA SOUND is a compression-resistant heavy duty mat with a thickness of approx. 3.5 mm. A fleece fabric is laminated on both sides. Polyethylene is not UV-stable in the long term; the product should not be stored in places with prolonged exposure to direct sunlight.

Material properties and areas of application

Schluter DITRA SOUND is non-rotting, stretchable and crack-bridging. In addition, it is largely resistant to the effects of aqueous solutions, salts, acids and alkalis, many organic solvents, alcohols and oils. Product resistance to special local conditions must be verified separately based on the anticipated concentration, temperature and length of exposure. The product has a relatively high water vapour diffusion seal. The material is non-toxic and physiologically harmless. Schluter DITRA SOUND can be used in a wide variety of application areas. Product suitability must be verified in applications exposed to chemical or mechanical stresses.

How to install this product

  1. The substrate must be load bearing, level and free of components that may inhibit bonding. Any necessary levelling work must be completed before installing Schluter DITRA SOUND.
  2. Cover the edges of the covering at rising walls or structural elements with the self-adhesive edging strip Schluter DITRA SOUND RSK to prevent stress build-up or sound transmission.
  3. The selection of the cementitious tile adhesive for installing the product depends on the substrate. The adhesive must bond with the substrate and mechanically attach to the Schluter DITRA SOUND anchoring fleece when curing. A dry setting cementitious tile adhesive is suitable for most substrates. Review any potential material incompatibilities beforehand.
  4. Apply the cementitious tile adhesive on the substrate with a notched trowel (recommended size: 3 x 3 mm or 4 x 4 mm).
  5. Embed the panels, which must have been cut to size beforehand, in the installed adhesive, the printed side of the anchoring fleece facing down. Immediately press them in place with a float or roller, working in a single direction. The curing time of the adhesive must be observed. For efficient installation, precisely align the panels when placing them on the substrate. Install the individual panels with closely abutting joints. Remove any excess adhesive.
  6. Attach the self-adhesive Schluter DITRA SOUND KB sealing tape over all abutting seams to prevent sound transmission.
  7. To prevent any damage to the installed Schluter DITRA SOUND or detachment from the substrate, it is recommended to protect the area from mechanical stresses, e.g. by setting out running boards (particularly in centre areas used for material transport).
  8. Immediately after adhering the mats, tiles can be installed using the thin-bed method, with a cementitious tile adhesive that meets the requirements of the respective covering. Groove the cementitious tile adhesive with a notched trowel matching the corresponding tile format. All tiles must be solidly embedded in the adhesive. Full contact according to the applicable professional regulations is especially relevant for coverings exposed to high mechanical stresses. Observe the curing time of the adhesive. The adhesive must be able to cure hydraulically or through another chemical reaction in an airtight space without any water evaporation.
  9. Follow the instructions in the data sheet and other relevant technical regulations to install movement joints for perimeter, edge and transition profiles.

Substrates for Schluter DITRA SOUND

Always check the substrates on which Schluter DITRA SOUND is to be installed to make sure they are level, load-bearing, clean and compatible with the materials to be used. Remove all surface components that may weaken the bond. Any levelling, height adjustment or slope compensation must be carried out before installing the product.


Concrete undergoes long-term structural deformation due to shrinkage. With the use of Schluter DITRA SOUND, tiles may be installed after three months.

Cement screeds

With the use of Schluter DITRA SOUND, tiles may be installed over cement screeds after 28 days. There is no need to measure the residual moisture.

Calcium sulfate screeds

According to the applicable rules, calcium sulfate (anhydrite) screeds may not have a residual moisture level of more than 0.5 CM % at the time of tile installation. In contrast, tiles may be installed as soon as the residual moisture level drops below 1 CM % with Schluter DITRA SOUND. Because calcium sulfate screeds are susceptible to moisture, screeds must be protected against humidity, e.g. moisture seepage on the underside.

Heated screeds

Schluter DITRA SOUND can also be used on heated screeds. In this case, the applicable regulations for conventional heated screeds in conjunction with tile coverings must be observed.

Plywood panels

These materials undergo significant deformation based on the influence of moisture (or fluctuations in humidity). It is therefore recommended to use plywood materials with special water-repellent treatment to protect against moisture. The panels must be thick enough to be sufficiently stable in conjunction with a suitable support structure. The panels must be sufficiently secured with screws. All joints should either be tongue and groove connections or covered with adhesive. Perimeter movement joints of about 10 mm have to be maintained at the transition to upright building structures. The product neutralises any minor tensions that may occur within the substrate.

Hardwood floors

In principle, ceramic coverings can be directly installed on sufficiently weight bearing, screw-fastened hardwood floors with tongue and groove connections in conjunction with Schluter DITRA SOUND. The wooden substrate should have balanced moisture levels before Schluter DITRA SOUND can be installed. It has proven beneficial to install an additional layer of plywood. Uneven floor surfaces should be levelled with suitable measures beforehand.

Synthetic/vinyl coverings and coatings

All surfaces must be load bearing and pre-treated or suitable for bonding with an appropriate adhesive, in which the Schluter DITRA SOUND anchoring fleece can be embedded. The compatibility of the adhesive with the substrate and with Schluter DITRA SOUND must be verified in advance.


Schluter DITRA SOUND also enables sound insulation assemblies in staircases. It can be used on the various substrate types described above.

Technical Data:
Material: Heavy polyethylene mat
Delivery format: 550 x 750 mm = 0.41 m2 / unit
Material thickness: Approximately 3.5 mm
Weight: Approximately 5.5 kg/m2
Thermal conductivity: 0.40 W/(m•K)
Area thermal insulation: 0.007 m2•K/W
Water vapour diffusion resistance rating: μ = 86000
Equivalent air layer thickness: sd = 250 m
Building materials class: B2 acc. to DIN 4102

Product Datasheet

Click here to view this product on the Manufacturers website.

Additional information

Weight N/A

DITRA SOUND 500mm x 750mm Mat, DITRA SOUND KB 38mm x 50m Joint Tape, DITRA SOUND RSK 6mm x 30mm Insulation Strip 10m Roll