Acoustic Spray Plaster

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BoSpray – Cellulose Acoustic Spray Plaster

This cellulose based acoustical spray plaster can be easily applied to virtually any substrate. Suitable for walls and ceilings, curved or irregular shapes and can be applied behind pipework or ducting. It is particularly suitable for use in large areas with hard surfaces where people com together and clarity of sound is required.

BoSpray boasts excellent acoustical properties. One application typically achieves a finish which gives over 60% sound absorption. Higher levels of acoustic performance can be achieve with an increased thickness of application.

Based on 95% recycled cellulose this is an environmentally friendly sustainable product. Ideal for both new constructions and renovations, where the acoustics in a building are important. It is suitable for use in high humidity areas such a swimming pools and resistant to damage from water and condensation.

BoSpray Acoustic Spray Plaster Application

The product is installed using a specialists sprayer or cellulose fibre blower. The fibre is mixed with the binder which contains additives to ensure excellent adhesion and fire resistance in the nozzle of the machine. This water-based emulsion is then sprayed onto the surfaces requiring treatment. Application of this acoustic spray plaster is carried out by approved and trained installers to ensure the correct finish.

  • Substrate needs to be clean, dry and free of dust; 
  • Remove lose parts; 
  • Completely close holes and cracks in substrate; 
  • Unevenness >3mm must be smoothened; 
  • Aluminum or plastic profiles need to be placed to end the spray work when it is not possible to end against a wall or window frame.


The acoustic spray plaster finish is robust and resistant to mould & water damage. It is flexible and highly resistant to cracking or flaking. Very little maintenance is required. If the ceiling or wall is damaged or modified  then repairs are are straight forward. The fibre and binder can be mixed together and simply applied by hand. 

Can I Paint Acoustical Spray Plaster?

If you have an acoustic plaster then it is there for a reason. You want it to absorb sound. If you paint over or cover this specialist finish then the acoustic properties may be compromised. A normal coating or paint is designed to form a closed film and so tends to close the surface. This will then cause the surface to reflect sound and increase echoes and reverberation with-in the area. We have specialist acoustical coatings available which change the colour of the finish whilst keeping the surface acoustically ‘open’. This maintains the acoustic values of the spray plaster.

Sound Absorption

Sound absorption or noise deadening, is one of the key properties of Quietstone. The structure of the material is designed to take in and absorb the sound energy. This unwanted sound is then lost or transmitted away thus ‘deadening’ the noise.


  • Offices, Meeting Rooms
  • Airports, Train Stations
  • Supermarkets, Showrooms, Retail Spaces
  • Restaurants, Cafes, Bars
  • Industrial Areas, Warehouses
  • Swimming Pools, Gyms, Sports Halls
  • Auditoriums, Cinemas, Conference Rooms
  • Schools, Canteens

Technical Specifications

Thickness25mm in a single application

Sound Absorption (Noise Reduction Coefficient)NRC of 0.65 at 25mm, NRC of 0.9at 40mm

Fire ResistantClass Bs1 d0 (according to EN 13501-1)

Environmental 80% Pre-Consumer Recycled Content, Adhesive VOC Content < 1 ppm

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Quietstone Acoustic Products
Quietstone UK Ltd

Nab Quarry, Pott Shrigley, Macclesfield, Cheshire, SK10 5SD