Large warehouses, sports halls, factories and restaurants often have the same acoustic problem: lots of hard surface area and very little absorption. Metal decking, concrete, glazing and blockwork reflect sound back into the space, extending reverberation and making speech, alarms and everyday activity harder to understand.
Where suspended panels or rafts are awkward because of services, complex ceiling geometry or the scale of the building, Quietstone BoSpray acoustic spray offers another route: a cellulose-based absorptive finish sprayed directly onto suitable walls, ceilings and profiled decking.
What is acoustic spray?
BoSpray is a specialist-applied cellulose acoustic coating with high recycled content and a low-VOC binder. It forms a porous layer that absorbs reflected sound rather than allowing all of that energy to bounce from the original hard surface.
Spray application is particularly useful on large ceilings, curved areas and around ducts, pipes and other services where panel systems can need complicated cutting and suspension.
How much sound does BoSpray absorb?
| Thickness | Published NRC | Absorption class |
|---|---|---|
| 15mm | 0.65 | D |
| 25mm | 0.75 | C |
| 37.5mm | 0.85 | B |
| 40mm | 0.95 | A |
The correct thickness depends on the reverberation target, room geometry and available surface area. These are laboratory absorption data, not dB sound-insulation figures.
Where acoustic spray makes sense
- Warehouses and factories
- Sports halls, gyms and indoor padel facilities
- Swimming pools and humid leisure spaces
- Restaurants, cafés and bars
- Schools, canteens and auditoriums
- Open-plan offices
- Retail and showrooms
Why industrial metal-deck ceilings are a strong application
Profiled steel decking is hard, reflective and usually interrupted by lights, pipes, cable trays, sprinklers and ventilation. BoSpray can follow the profile and work around existing services, turning much of that reflective ceiling into absorption without installing a forest of suspended rafts.
Quietstone project examples
Sheffield – approximately 1,800m²
Quietstone supplied a Sheffield project where Eco Grey BoSpray was applied to around 1,800m² of trapezoidal decking. This is exactly the type of large hard-surface environment where spray treatment becomes commercially attractive.
Warrington – approximately 400m²
Another project used around 400m² of BoSpray to decking within a café area, applied around the existing ceiling services rather than removing them.
BoSpray vs Quietstone rigid acoustic panels
| Product | Best suited to | Main advantage |
|---|---|---|
| BoSpray | Large, irregular, service-heavy walls and ceilings | Seamless spray-applied absorption |
| Quietstone Acoustic Panels | External, impact-prone or modular treatment | Rigid, weather-resistant absorber |
For outdoor padel and noise-screen applications, read our Quietstone padel noise guide.
Fire, moisture and finish
BoSpray is published with an EN 13501-1 reaction-to-fire classification of B-s1,d0 and is described as resistant to condensation, mould and mildew. It can therefore suit demanding commercial and humid locations when the full project specification is appropriate.
Colour can be selected to work with the architecture rather than automatically accepting a standard grey industrial finish.
Is acoustic spray suitable for your project?
Send Soundproofing King the approximate treated area, photographs or drawings, ceiling or wall type, room use, height and required finish. We can help establish whether spray treatment, rigid acoustic panels or a structural soundproofing system is the better route.
