SonaSpray fcx acoustic plaster

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A one coat, fire rated, decorative acoustic plaster finish with an attractive, flat and lightly pitted surface. 

Sonaspray FCX - Environmentally friendly acoustic spray plaster

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Acoustic plaster for stylish architectural designs

A visually beautiful room may not be a pleasurable place to spend time due to poor architectural acoustics.  Hard, flat surfaces such as wooden floors and plastered walls reflect sound, thereby increasing and amplifying noise levels within the space, resulting in poor acoustics and sound quality.

SonaSpray fcx acoustic plaster is a one coat, acoustic decorative finish with an attractive, flat and lightly pitted surface for reverberation control in buildings.  SonaSpray fcx acoustic plaster spray will conform to any surface shape, providing that the surface curvature will allow finishing with a trowel.  The high performance adhesive will bond to virtually all common construction materials including plaster, wood, metal and concrete.  

Note: Some surfaces such as water or tobacco stained ceilings, timber and oxidised metal will require sealing to prevent migratory staining into the SonaSpray fcx finish.

Sonaspray FCX - Environmentally friendly acoustic spray plaster installed in HIDE restaurantHIDE Restaurant. Lusted Green Architects. Andrew Meredith photography.

Fire rated

All our products significantly better the new fire requirement required under the updated Approved Document B.

Note:   Always insist on obtaining a copy of the fire test report before using a product.

Its Class 0 to BS476 & B-s1,d0 fire rating provide significant benefits over the new Approved Document B requirements by providing little to no smoke and absolutely no droplets, assisting in the safe escape of occupants. 

View full SonaSpray fire ratings

Features & benefits of SonaSpray fcx acoustic plaster
  • Controls sound & noise reverberation by absorbing sound energy instead of reflecting it thereby reducing reverberation times & overall noise levels.
  • Can contribute up to 17 points to the overall LEED (Leadership in Energy and Environmental Design) rating of a project.
  • Product-Specific, Environmental Product Declarations (EPDs) to ISO 14025 are available for our SonaSpray products. See related PDFs.
  • Achieves M1 certification for Building Materials emissions.
  • Class 0 to BS476 & B-s1,d0 fire ratings (full fire test reports available on request). View full fire ratings.
  • Can be applied to virtually any substrate configuration.
  • The adhesive provides a durable, strong & resilient bond.
  • Insulates by creating dead air macroscopic spaces between & within hollow cellulose fibres.
• environmentally friendly acoustic plaster • recyclable • low embodied energy • carbon neutral

View full SonaSpray range

Sonaspray FCX - Environmentally friendly acoustic spray plaster installed in HIDE restaurantSonaSpray fcx painted to create a stunning velvet effect iRosewood Hotel Scarfes Bar.
Interior Architecture & Design Studio Martin Brudnizki Design.

Seamless finishes from textured to plaster smooth

The standard acoustic plaster white finish can be spray painted to the chosen colour with a minimal effect on the sound absorption qualities of SonaSpray fcx and its ability to achieve great architectural acoustics.  Bespoke colour materials are also available (minimum order quantities apply).

Ideal for use in offices, homes, swimming pools, public places, classrooms, restaurants and so much more.

We have independent acoustic test data for painted fcx which is available on request.  


Future reconstruction of buildings may require removal of SonaSpray.  It can be recycled or disposed of as a non-special waste.  Your local authority environmental department will give advice on recycling.

Request a SonaSpray brochure

What people say about our SonaSpray fcx acoustic spray installations...

"The architect's solution of fitting high level, sound absorbing panels produced a negligible improvement.  We continued to battle'with intolerable echo'making the room unfit for its purpose.

Following an independent sound monitoring exercise, an alternative acoustic dampening application was recommended and Sonaspray fcx acoustic spray was selected.  My caretaking staff were greatly impressed by the attention to detail paid by your engineers during the installation procedure.  Every surface was carefully covered and the entire procedure was completed professionally .

The effect of the application has been tremendous!  The hall is a different room and PE, assemblies and lunch-times have become pleasurable occasions compared to the sonic battleground we experienced previously."

Headteacher, Meadowside School, Gloucester
5 star review rating  


“Simply Awesome! It's created a totally different dining environment. Speech and music are clear and all background clutter noise has gone. The restaurant feels comfortable and somehow warmer and cosier.”

Comments from Black Tiles Restaurant owner Tim Yeo, (as featured on BBC Radio Four - architectural acoustics report)
  5 star review rating

Contact us

For more information regarding our acoustic plaster range or if you have any questions regarding building acoustics you can call us direct on 01474 854902 or fill in our contact us form and a member of our friendly team will get back to you as soon as possible.

Speak to an acoustic expert



SonaSpray fcx acoustic plaster installations

Hard Rock Hotel, London

Hard Rock Hotel, London

SonaSpray fcx and SonaSpray fc were specified for Londons new Hard Rock Hotel throughout the café and bar, providing a seamless and decorative acoustic solution.  The spray absorbs excessive noise, creating a pleasant ambience by giving clarity to music and speech, transforming what would otherwise have been a cacophonous space.

Hide Restaurant - Restaurant acoustics


Hide is a new 13,500 square feet, dramatic three-level, Michelin star HIDE restaurant and bar situated in Piccadilly, London. Our specialist in-house installation teams expertly applied SonaSpray fcx in two bespoke whites to feature curved ceilings on both the ground and first floors of the restaurant to create a relaxed and enjoyable dining experience for its guests.

Vajrasana Buddhist Retreat

Vajrasana Buddhist Retreat

Vajrasana is a bespoke Buddhist retreat centre situated in the picturesque Suffolk countryside.  With such a project, reverberant spaces with high noise levels and unclear speech would not be appropriate so acoustic treatment was required throughout.  

Scarfes Bar, Rosewood Hotel - Restaurant Acoustics

Scarfes Bar, Rosewood Hotel

SonaSpray fcx acoustic plaster applied to ceiling in the seriously stylish Scarfes Bar in the Rosewood Hotel, Holborn to control reverberation for excellent restaurant and bar acoustics.  It was then painted to create a stunning velvet effect.

Dishoom Restaurant Manchester

Dishoom Restaurant, Manchester

Architects Macaulay Sinclair specified Oscar Acoustic's SonaSpray fcx for the upper walls of this fantastic new Dishoom Restaurant recently opened in Manchester. 

Windermere Jetty Museum acoustics

Windermere Jetty Museum

We were specified to acoustically treat the boat exhibition halls and museum cafeteria area of this stunning museum to ensure that the acoustic ambience was fitting with the calming and beautiful surrounding views and would not steal any focus from the interior design or exhibitions on display. 

Dishoom Restaurant - Restaurant Acoustics

Dishoom Restaurant, London

Architects Macaulay Sinclair specified Oscar Acoustic's SonaSpray fcx acoustic spray plaster finish onto plasterboard at 12mm thick for the ceilings in the famous Dishoom restaurant in the heart of Kensington, London.

Colchester Visual Arts Centre

Colchester Visual Arts Centre

A large space like this project in the Colchester Visual Arts Centre would normally be extremely reverberant and noisy with its timber floor & minimal walls; but instead the feeling is more of a grand open space that is lined with plush carpets and soft furnishings after being treated with our SonaSpray fcx recycled, architectural, acoustic spray finish.

Hope Academy - Wilmott Dixon - School Acoustics

Hope Academy - Wilmott Dixon

Hope Academy in Newton-Le-Willows was a BSF design and build project by Willmott Dixon. Outside acoustic consultation lead to Oscar Acoustics’ SonaSpray FCX being specified for the impressive giant feature, yellow pods in the main dining space, SonaSpray K-13 Special in light and dark grey for the auditorium walls and SonaPanel acoustic panels for the main sports hall upper walls.

SonaSpray fcx acoustic plaster technical specification

  Download BIM Object

Fire performance ratings

All our products significantly better the new fire requirement required under the updated Approved Document B.

European fire test by Efectis Nederland: 
B – s1, d0

UK fire test by Warrington fire research:
Class 0 to BS476 Part 6
Class l to BS476 Part 7

Full fire test reports available on request.  Note:   Always insist on obtaining a copy of the fire test report before using a product.

Its Class 0 to BS476 & B-s1,d0 fire rating provide significant benefits over the new Approved Document B requirements by providing little to no smoke and absolutely no droplets, assisting in the safe escape of occupants.  Click here for more information on the fire properties of SonaSpray and the new Approved Document B requirements.

Acoustic DATA

SonaSpray fcx installations are tailored to meet your specific projects architectural acoustic needs.  There is a choice of finish and acoustic performance.  Special colours can be manufactured for larger installations or for most applications the standard white RAL9010 finish can be refinished with water-based paint.  SonaSpray fcx may be applied at variable thicknesses and areas to provide designed acoustic ambience.  It is spray and trowel applied, building to the full thickness in one application.

SonaSpray fcx standard absorption coefficients

6mm 0.05 0.10 0.40 0.70 0.85 0.90 0.50 0.40
10mm 0.10 0.25 0.60 0.75 0.85 0.70 0.55 0.55
13mm 0.05 0.15 0.50 0.90 1.00 1.00 0.65 0.40
19mm 0.15 0.45 0.80 0.85 0.85 0.95 0.75 0.75

Acoustic testing has been carried out against concrete. Substrates likely to provide increased performance include plasterboard with the use of an air gap behind, rib deck or profiled metal sheet. Please contact Oscar Acoustics’ technical department for free design assistance.

Test DATA certified by TNO Technical University Delft NL.  Tests were on a solid substrate.  A panel substrate with air space behind the panel will change absorption; normally there is improved absorption at low frequency giving further flexibility in the design of architectural acoustics.


The SonaSpray range contributes towards many sustainable design and health certification systems including BREEAM, SKA, Living Building Challenge and adds up to 17 points towards the LEED (Leadership in Energy and Environmental Design) rating of a project.  

The SonaSpray range achieves M1 certification as Low Emitting Building Materials. This is the best possible classification.

M1 emissions classification certificate

SonaSpray finishes are compliant with CDPH/ CA Section 01350 and are GREENGUARD Gold Certified for Indoor Air Quality.  GREENGUARD Gold Products are now confirmed to show compliance with BREEAM rating system HEA Indoor Air Quality and ensure that a product has met some of the world’s most rigorous and comprehensive standards for low emissions of VOC’s into indoor air.  The range is also covered by an Environmental Product Declaration in accordance with ISO 14025 and meets the requirements of the Living Building Challenge and LEED.

Cellulose, the primary raw ingredient of SonaSpray, contains wood, cotton and other rapidly renewable natural resources.  These materials can effectively lower the carbon footprint of the building project by sequestering rich stores of carbon for the life of the structure or application.

Oscar Acoustics - ISO 14001 accredited

Oscar Acoustics have taken steps to reduce our environmental impact and demonstrate our commitment to protecting the environment by achieving ISO 14001 certification.  

ISO 14001 certified 
View ISO 14001 certificate

Thermal DATA

SonaSpray is excellent at thermally insulating by creating macroscopic air spaces between and within the cellulose fibres.  U-Values can be adjusted to your projects exact requirements by adjusting the spray material depth.  SonaSpray insulates by creating dead air spaces macroscopically between and within the hollow cellulose fibres.


Dry weight 4.50kg/m2 at 20mm thick.

Bonding to substrate

SonaSpray fcx can be applied to virtually any substrate; some surfaces may need priming to control suction.  Old surfaces may need a barrier coating to prevent staining from leaching out of contaminants whilst the surface is wet.  Fully cured SonaSpray fcx will not only improve the architectural acoustics but improve the strength of the substrate.


The adhesive used with SonaSpray provides a strong, durable and resilient bond.  Fully cured SonaSpray can improve the composite strength.

Recessed items

Recessed services e.g. spot lighting will require a halo spacer to match the material depth.  Oscar Acoustics manufacture and install stainless steel halo spacers (drawing available) to the same size as the hole cut out.  Stop beads may be required around openings which again we can supply and install.  Specially designed access hatches are also available through Profab, enabling the SonaSpray to continue across the hatch door.  Problems can arrise from using other hatches.  These items are at extra cost and are to be purchsed direct from the Profab.  Please contact Oscar Acoustics for details and item code.  Surface mounted fittings e.g. hanging/pendant lights will require pattresses to match the material depth.  Please contact Oscar Acoustics for further advice.

Please Note:  90% of flangeless fittings do not work properly with any acoustic finish.  If you are specifying a flangeless fitting, please contact Oscar Acoustics for advice.

Where to use

Any interior space requiring improved architectural acoustics; SonaSpray fcx can be quickly and effectively applied to most prepared surface and construction configurations helping to achieve minimum working down-time in existing structures, with abilities to meet critical deadlines in new construction.  SonaSpray fcx trowelled finish has a durable, flat pitted surface and is suited to walls and ceilings in restaurants (see photos), offices, public buildings, hotels, shopping complexes, conference rooms, large domestic rooms and indoor pools.

Quality assurance

  • SonaSpray is manufactured by ICC to ISO 9001.
  • Installed using a four stage Oscar Acoustics quality assurance plan.

Oscar was established in 1978; this experience enables us to provide a well detailed, quality installation that stands the test of time. From specification to installation, everything is kept in-house.  Oscar Acoustics only use qualified in-house operatives who specialise in installing our systems to ensure high standards are maintained.

Design assistance

  • BIM Objects available for every product.
  • All products are included within all current NBS software.
  • Recessed & surface mounted items possible – see website for more information.
  • Standard detail drawings for most situations.
  • Bespoke detailing solutions possible.


Standard Colours: (s) = Stock (ns) = Non-Stock

SonaSpray fcx: Arctic White (s), White (ns)

SonaSpray fc: Arctic White (s), White (ns), Black (ns)

SonaSpray K-13 Special: White (s), Light Grey (s), Grey (s), Dark Grey (ns), Black (s), Beige (ns), Tan (ns)

SonaSpray K-13: White (s), Light Grey (s), Grey (s), Dark Grey (ns), Black (s), Beige (ns), Tan (ns)

Bespoke colours are manufactured to order.  Minimum order quantities apply and square meterage is dependent on the product and thickness of spray.  Please send us your colour requirement using a Dulux paint reference and we will respond with quantity, price and colour samples.


SonaSpray fcx can be over-painted or applied with additional coats of SonaSpray.  Small damage can be repaired by hand. If SonaSpray fcx is disturbed or damaged so that fibre is released into the atmosphere, the resulting contamination is harmless.  Maintenance work can be undertaken while the building is occupied.  Please refer to COSHH data for detailed product analysis.

SonaSpray is manufactured by ICC, Houston, Tx 
ISO 9001: 2000 certification

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