Why Acoustic Spray Is the Next-Generation Acoustic Solution
Modern architecture is visually impressive — but acoustically problematic.
Concrete ceilings, exposed services, metal decks and open layouts reflect sound aggressively, creating:
• Excessive echo
• Poor speech clarity
• High noise levels
• Thermal inefficiency
• Condensation risk
• Fire safety concerns
Acoustic Spray solves all of these problems in a single integrated system.
It is a spray-applied, thermo-acoustic insulation system engineered to deliver:
- Acoustic absorption
- Thermal insulation
- Fire resistance
- Condensation control
- Environmental sustainability
- Seamless architectural finish
— without the need for suspended ceilings or additional panels.
What Is Acoustic Spray?
Acoustic Spray is a spray-applied cellulosic insulation made from specially processed recycled natural fibres, combined with a proprietary water-based binder.
It is:
• Seamless
• Monolithic
• Spray-applied directly to ceilings or walls
• Suitable for concrete, metal, gypsum and wood substrates
According to the technical datasheet, it is manufactured using 80% recycled content, treated for fire, mold, mildew and microbial resistance, and applied using controlled fibre-binder spray equipment.
Key Technical Performance
Acoustic Performance
Acoustics Spray absorbs sound energy instead of reflecting it, significantly reducing reverberation and improving speech intelligibility.
The datasheet shows:
| Thickness | NRC |
|---|---|
| 10 mm | 0.55 |
| 15 mm | 0.71 |
| 20 mm | 0.80 |
| 25 mm | 0.86 |
| 30 mm | 0.95 |
This means at 15 mm thickness, Cellulo Spray already delivers a high NRC of 0.71, making it ideal for offices, classrooms, commercial buildings and public spaces.
Independent laboratory tests also show weighted absorption coefficient αw = 0.70 (MH) according to ISO 11654
Fire Performance
Fire safety is critical in commercial buildings.
Acoustic Spray is classified as:
Fire Class: B-s1, d0 (EN 13501-1)
Meaning:
• Limited combustibility
• Very low smoke emission
• No flaming droplets
The dense fibre structure and fire retardants slow flame spread by up to 57% more than untreated materials
Thermal Performance
Acoustics Spray is also a high-performance thermal insulation:
• Thermal conductivity λ = 0.037 W/mK (ISO 8302)
• R-value at 50 mm thickness = 1.35 m²K/W
• Reduces thermal bridges due to seamless spray application
• Can deliver up to 70% energy savings in suitable applications
This helps improve energy efficiency and occupant comfort
Environmental & Health Safety
Acoustics Spray is engineered for healthy indoor environments:
• 80% recycled content
• No carcinogens
• No harmful emissions
• Open-cell breathable structure
• Prevents mold, dampness and rust
• Anti-bacterial and anti-fungal — Class BA:0 for all tested organisms
(Tested per EN 15101-1:2013) AVS Sound Proof Acoustic-
It may contribute toward green building certifications such as LEED.
Where Acoustic Spray Is Used
Acoustic Spray is ideal for:
• Open-plan offices
• Commercial buildings
• Schools and universities
• Auditoriums
• Libraries
• Hospitals
• Airports and transit halls
• Restaurants and cafés
• Industrial facilities
• Gymnasiums and sports halls
• Swimming pools and ice rinks (for condensation control)
Its spray-applied nature makes it perfect for retrofit projects and complex ceiling geometries.
Why Architects and Developers Choose Spray
1. Seamless Finish
No grids, no joints, no panels — a clean monolithic ceiling finish.
2. Multi-Functionality
One product delivers acoustics, thermal insulation, fire protection and condensation control.
3. Design Flexibility
Available in standard colours:
• White
• Natural Grey
• Black
…and custom colours on request.
4. Speed of Installation
Fast spray application over large areas.
5. Cost Efficiency
Eliminates the need for multiple separate systems (acoustic panels + insulation + fire coating).
Installation Method
The system is installed by trained applicators using:
• Approved fibre spray machines
• Controlled fibre-binder ratio
• Proper substrate preparation
• On-site thickness control
• Final curing and inspection
It adheres to:
• Concrete
• Metal decks
• Wood
• Gypsum boards
as a durable, strong, seamless layer
Limitations
Acoustics Spray should not be used:
• In areas continuously above 65°C
• Where washable surfaces are required
• In areas with combustible dust or oil contamination
• On contaminated or unstable substrates (unless properly sealed)
Frequently Asked Questions — Acoustic Spray
1. What is Acoustic Cellulo Spray?
Acoustic Spray is a spray-applied, cellulosic acoustic and thermal insulation material made from recycled natural fibres. It is applied directly to ceilings or walls to reduce echo, improve sound quality, provide thermal insulation, and enhance fire safety.
2. How does Acoustic Spray improve acoustics?
It absorbs reflected sound energy, reducing reverberation and echo. This improves speech clarity and lowers overall noise levels, making spaces more comfortable and acoustically balanced.
3. Is Acoustic Spray suitable for offices and commercial buildings?
Yes. It is widely used in offices, commercial spaces, schools, hospitals, airports, auditoriums, and hospitality environments due to its performance, safety, and aesthetic finish.
4. What is the NRC value of Acoustic Spray?
At 15 mm thickness, Acoustic Spray typically achieves an NRC around 0.7, meaning it absorbs approximately 70% of incident sound energy.
5. Is Acoustic Spray fire resistant?
Yes. It is classified as B-s1, d0 under EN 13501-1, indicating low flammability, minimal smoke production, and no flaming droplets.
6. Is Acoustic Spray environmentally friendly?
Yes. It contains a high percentage of recycled content and is considered an eco-friendly acoustic insulation solution suitable for sustainable building projects.
7. Can Acoustic Spray be applied on any surface?
It can be applied to concrete, metal, wood, and gypsum board surfaces, provided the substrate is clean, dry, and structurally stable.
8. Does Acoustic Spray provide thermal insulation as well?
Yes. It also acts as thermal insulation, helping to reduce heat transfer and improve indoor temperature stability.
9. Is Acoustic Spray safe for indoor air quality?
Yes. It is treated with anti-bacterial and anti-fungal additives and does not release harmful emissions, making it safe for occupied indoor environments.
10. Can it be used in humid environments like swimming pools?
Yes, it is suitable for high-humidity environments such as swimming pools and ice rinks where condensation control is required.
11. How long does installation take?
Installation is fast because the material is spray-applied. Most projects can be completed in a few days, depending on area size and thickness requirements.
12. Does Acoustic Spray require maintenance?
No regular maintenance is required once installed. It is durable and stable under normal indoor conditions.
13. Can Acoustic Spray be painted?
It is available in standard colours (white, natural grey, black). Painting is generally not recommended as it can affect acoustic performance.
14. Is Acoustic Spray better than acoustic panels?
They serve different purposes. Acoustic Spray is ideal for large ceiling areas and exposed structures, while panels are better for walls and design-focused applications. Often, both are used together.
15. Is Acoustic Spray suitable for retrofit projects?
Yes. It is especially useful for retrofit projects because it can be applied over existing ceilings without structural changes.
16. Does it block sound between rooms?
No. It mainly improves sound absorption inside a space. For sound blocking between rooms, soundproofing systems are required.
17. What thickness is recommended for best performance?
15 mm is a common thickness for offices and commercial spaces. Higher thicknesses can be used for higher acoustic or thermal requirements.
18. Does Acoustic Spray attract insects or pests?
No. It is treated to resist insects, mold, bacteria, and fungal growth.
19. Is it suitable for industrial or factory environments?
Yes, as long as the environment is not exposed to oil mist, combustible dust, or temperatures beyond the product’s limits.
20. How do I get a quotation or technical consultation?
You can contact BEL Acoustics to arrange a site visit or technical review. We will assess your requirements and provide a customised proposal.
Why This Converts for Building Owners
- ✔ Reduces noise complaints
- ✔ Improves occupant comfort
- ✔ Enhances building value
- ✔ Supports sustainability goals
- ✔ Improves fire safety compliance
- ✔ Lowers HVAC energy costs
- ✔ Provides premium architectural finish
This makes it highly attractive to:
• Commercial developers
• Corporate facility managers
• Architects and consultants
• School administrators
• Hospitality owners
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