SonaSpray fc

SonaSpray FC - Environmentally friendly sound absorbing spray

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A one coat, Class 0 & BS EN 15102 fire rated, seamless, decorative sound absorber for reverberation control in buildings.

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Natural cellulose fibre sound absorbing spray

All our products significantly better the new required fire classification under BS EN 15102.

SonaSpray fc is a Class 0 and BS EN 15102 fire rated, one coat, seamless, decorative sound absorber that is spray applied to virtually any clean surface and any shape of surface.  It has a lightly textured and firm finish.

SonaSpray fc sound absorbing spray will conform to most surface contours.  In addition to flat surfaces it can be applied to:  barrel vaults, domes, corrugated decks, pan construction and other complex surfaces. 

The high performance adhesive will bond to virtually all common construction materials including plaster, wood, metal and concrete. 

SonaSpray FC - Environmentally friendly sound absorbing spray installed in New Bailey Contractor Overbury

SonaSpray fc sound absorbing spray throughout One New Bailey office breakout areas. Credit to Overbury & TP Bennett.

Some surfaces, such as water stained ceilings, wood and oxidized metal, will require sealing to prevent migratory staining of the SonaSpray finish.  SonaSpray fc acoustic spray can be installed where panels or stretch fabrics are impossible and even with thin coatings it is an excellent sound absorber for building interiors.

• Carbon neutral • Low embodied energy • Environmentally friendly • Recyclable

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Sound absorbing spray

SonaSpray fc in white applied to feature wave design ceiling.  An excellent sound absorber which also helps to reduce
condensation within a swimming pool area when it is combined with appropriate ventilation. 

Features of SonaSpray fc sound absorbing spray
  • Achieves M1 certification for Building Materials emissions.
  • Class 0 fire rated to BS476 and BS EN 15102 (full fire test reports available on request).
  • Acts as the perfect sound absorber for buildings by absorbing sound energy instead of reflecting it, thereby reducing reverberation times and overall noise levels.
  • Can contribute up to 17 points to the overall LEED (Leadership in Energy and Environmental Design) rating of a project.
  • The adhesive provides a strong, durable and resilient bond.
  • Can be applied to virtually any substrate configuration.
  • Aids in condensation and humidity control by absorbing large amounts of water vapour and releasing it when humidity levels drop, promoting a healthy and balanced atmosphere.
  • Insulates by creating dead air macroscopic spaces between and within the hollow cellulose fibres.
  • Spray directly onto plasterboard, concrete, steel sheet and most other surfaces.

Listen to the amazing acoustic results!

SonaSpray fc is the sound absorbing spray that transforms a noisy, reverberant space into a pleasant acoustic ambience with clarity of speech and music. 

LISTEN to before & after SonaSpray fc treatment

Sound absorber SonaSpray fc testimonial

“I am writing to congratulate your company for the success achieved in the reduction of the noise level in our school dining room when 200+ children are having their lunch.  Prior to the application of SonaSpray fc the noise level was deafening and now it is possible to talk to ones neighbour in a normal voice when lunching at the staff table.  We shall certainly use you again in certain other school rooms where the noise levesl are high or the acoustics are poor.

D.K.Emmett, Bursar, Fulham Prep School
5 star review rating  

Typical SonaSpray fc sound absorber applications

Future reconstruction of buildings may require the removal of our environmentally friendly SonaSpray sound absorber.  It can be recycled or disposed of as a non-special waste and your local authority environmental department will give advice on recycling.

SonaSpray FC - Environmentally friendly sound absorbing spray installed in Blavatnik School of Government

SonaSpray fc sound absorber applied directly to finished concrete throughout Blavatnik School of Government.  
Credit to Laing O'Rourke, Hoare Lea Acoustics & CG Reynolds.

Contact us

For more information regarding our sound absorbing spray range 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 fc installations

Civic House

Civic House

SonaSpray fc was applied by one of our expert installation teams throughout this impressive foyer area of Civic House, Birmingham to control noise reverberation. Cat A refurbishment by Associated Architects.

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.

Blavatnik School of Government, Oxford - University Acoustics

Blavatnik School of Government

SonaSpray fc acoustic spray and sound absorber in arctic white was applied directly to finished concrete throughout the atrium, seminar rooms and lecture theatres in Blavatnik School of Government in Oxford for perfect university acoustics.

School Acoustics - UCL Torrington - School Acoustics

University College London

With its student population increasing rapidly, University College London (UCL) required more space on its campus in Bloomsbury.  Working with the University’s Design Team, Structure Tone helped develop a scheme to refurbish the ground floor and basement and also renovate Level 10 at Torrington Place.  

Hilton London Bankside Hotel Acoustics

Hilton London Bankside Hotel

Designed by architects Dexter Moren Associates, the five star Hilton London Bankside near Tate Modern & The Shard, represents the next generation of design-led Hilton Hotels.

Church Acoustics - St. Thomas Church, Hanwell

St. Thomas Church, Hanwell

A recent major refurbishment to this grade II* listed building included improvement to the church acoustics. After research by acoustic consultants - Peninsular Acoustics - an acoustic coating of SonaSpray fc sound absorber in off white was proposed at 25mm thickness to control reflected noise from hard surfaces.

One New Bailey, Manchester - Office Acoustics

One New Bailey

64,000 sq ft of interiors completed for law firm Freshfields Bruckhaus Deringer's offices at One New Bailey in Manchester.  Our SonaSpray FC acoustic decorative finish and sound absorber was spray applied, directly to the metal profile deck to control reverberation within their offices and cafeteria/break out areas.

University of Leicester - University Acoustics

University of Leicester

The large, open plan design of Leicester University’s new Student Union building meant that in order for it to be fit for purpose, i.e. a relaxing space to meet socialise and study, some kind of sound absorber was going to be needed.  Options were limited due to the half glazed and half curved feature sail design of the ceiling.

Swimming Pool Acoustics - Greenwich Centre Swimming Pool

Greenwich Centre swimming pool

SonaSpray fc in white applied to a ceiling surface is an ideal sound absorber and also helps to reduce condensation in the pool area when it is combined with appropriate ventilation.  SonaSpray fc will provide the pool with a bright, attractive ceiling for years to come with excellent swimming pool acoustics.

Stadium Acoustics - Wembley Stadium

Wembley Stadium

During 2000, following the repositioning of the main stage at the original Wembley Stadium, concert goers complained to the management about poor stadium acoustics spoiling their enjoyment of the concert.

Acoustic decorative coatings - BT Groups

BT Groups

When BT Groups, 19th Century Faraday Building in the City of London received a major refurbishment the main contractor was looking for a decorative coating that would refurbish the old existing concrete soffit using a single coat.  Our SonaSpray fc acoustic decorative coating was specified and our specialist installation team applied it directly onto the old concrete ceiling throughout the offices in a matter of days. 

Echo problem - Emlyn Hughes House

Echo problem - Emlyn Hughes House offices

Emlyn Hughes House is designed to provide drama both from the exterior and interior.  The Gateway Project was intended to represent the history of the town by resembling a submarine, construction of which is the towns primary industry.

SonaSpray fc technical specification

Download BIM Object

Fire performance ratings

All our products significantly better the new required fire classification under BS EN 15102.

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

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

Full fire test reports available on request.

Acoustic DATA

SonaSpray fc installations can be tailored to meet your specific project acoustic needs.  There is a choice of finish; you may select texture, colour and acoustic performance.  SonaSpray fc can be applied at variable thicknesses and variable areas to provide designed acoustic ambience.  It is spray applied to the full sound absorber thickness in one application.

SonaSpray fc standard absorption coefficients

8mm 0.10 0.20 0.55 0.75 0.80 1.00 0.60 0.50
12mm 0.10 0.35 0.80 0.95 1.00 1.00 0.65 0.65
16mm 0.10 0.35 0.85 1.00 1.00 0.95 0.70 0.65
20mm 0.10 0.35 0.85 1.00 1.00 0.95 0.75 0.65
25mm 0.05 0.40 0.95 1.00 1.00 1.00 0.85 0.70

Test DATA certified by TNO Technical University Delft NL.  Tests were on a solid backing.  A sound absorbing fc panel substrate with air space behind the panel will change absorption; normally there is improved absorption at low frequency.

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.

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.


SonaSpray fc achieves M1 certification for Building Material emissions.  This is the best possible classification.  Click here for 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.


  • Dry Weight of SonaSpray fc per 10mm thickness = 1.60 kg/m2
  • Wet Weight of SonaSpray fc per 10mm thickness = 2.93 kg/m2
  • Dry Weight of SonaSpray fc per 20mm thickness = 3.20 kg/m2
  • Wet Weight of SonaSpray fc per 20mm thickness = 5.86 kg/m2

Bonding to Substrate

SonaSpray fc sound absorber 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 fc will improve strength. 

Bond Strength: SonaSpray fc >600 psf ASTM E-736
Compression Strength: SonaSpray fc >400 psf ASTM E-761


The adhesive used with SonaSpray fc sound absorber provides a strong, durable and resilient bond. When fully cured, surface strength of old plaster will typically improve.

Condensation control

For areas such as indoor pools, SonaSpray fc aids in condensation control.  The proper combination of SonaSpray fc and ventilation prevents condensation on metal, concrete and other surfaces.  SonaSpray fc sound absorber actually reduces ventilation requirements, saving in both the ventilation equipment cost and operating costs.

RH control

SonaSpray fc is a natural humidity moderator.  At times of increasing humidity SonaSpray fc will absorb large amounts of water vapour.  When the humidity drops SonaSpray fc will exhale water vapour and maintain a balance.  This characteristic promotes a healthy atmosphere.

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 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 purchased direct from the Profab.  Please contact Oscar Acoustics for details and an 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 flangless fitting, please contact Oscar Acoustics for advice.

Where to use

SonaSpray fc sound absorber can be quickly and effectively applied to most prepared surfaces and construction configurations.  This allows minimum working down time in existing structures with abilities to meet critical deadlines in new construction.  SonaSpray fc has a fine surface texture and is suited to ceilings of offices, restaurants, receptions, designer homes, school classrooms, swimming pools etc. in fact it is an excellent sound absorber for any premium indoor space with a noise problem.


SonaSpray fc sound absorber can be over-painted or applied with additional coats of SonaSpray.  Small areas of damage can be repaired by hand.  Maintenance of this seamless decorative sound absorbing finish is minimal.

If SonaSpray fc 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.


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

Fcx: Arctic White (s), White (ns)

Fc: Arctic White (s), White (ns), Black (ns)

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

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

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