SonaSpray fcx

Acoustic Decorative Finishes for Excellent Architectural Acoustics

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 architectural acoustics and sound quality.

SonaSpray fcx acoustic spray is a one coat acoustic decorative finish with an attractive, flat and lightly pitted surface. SonaSpray fcx acoustic 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. Some surfaces such as water or tobacco stained ceilings, timber and oxidised metal will require sealing to prevent migratory staining into the fcx SonaSpray finish.

  • Carbon Neutral
  • Low Embodied Energy
  • Good for the environment
  • Recyclable

Seamless finishes from textured to plaster smooth


Photo:  Scarfes Bar, Rosewood Hotel
SonaSpray fcx acoustic spray applied to plasterboard ceiling
Painted to create velvet finish

The standard acoustic spray 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. We have independent acoustic test data for painted fcx which is available on request.  Bespoke colour materials are also available; minimum order quantities apply.

SonaSpray fcx acoustic spray is a safe, recycled and natural cellulose fibre. 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.

For more information or to Request a brochure on SonaSpray fcx, call us on 01474 854902 or use our Enquiry Form

SonaSpray fcx Installations

Vajrasana Buddhist Retreat

Vajrasana is a bespoke new 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.  It was also important to keep the design simple and uncluttered so acoustic panels, ceiling tiles or rafts would not have been in keeping.

Oscar Acoustics has a class leading range of acoustic sprays and acoustic plasters for every project design and budget.  The specified product at Vajrasana Retreat was SonaSpray fcx acoustic spray at 12mm thick, applied in arctic white throughout and then spray painted off white in the main meditation space.

The SonaSpray acoustic spray range is also able to tick more boxes, due to it being made from Class 0 fire rated recycled paper and achieving M1 certification for emissions; the best classification achievable.

The end result thanks to the SonaSpray acoustic spray is a calm and relaxing space in which meditate, reflect and socialise.

Scarfes Bar, Rosewood Hotel

SonaSpray fcx acoustic spray was specified for this beautiful Edwardian Belle Époque building by Martin Brudnizki Design Studio, for its adjustable acoustic characteristics and monolithic flat but lightly pitted surface.  Oscar Acoustics acoustic sprays are also all capable of limitless continuous runs without the requirement for expansion joints, unless running over a building joint, which would have had a negative effect on the design.  Reducing the spray depth to 12mm from its maximum of 20mm meant, whilst it was possible to have an effortless conversation, there still remained an atmospheric buzz.

Once dry, the acoustic spray was then painted to create a velvet affect, adding to the warm a comfortable gentleman’s club theme.

Oscar acoustics designed cornice and lighting details to ensure they worked correctly with the acoustic spray at the required depth.

Dishoom, Kensington, London

Set in Kensington’s beautiful Grade II listed Barkers Building, Dishoom was designed by interior architects Macaulay Sinclair’s with the aim of transporting diners back in time to Jazz Age Bombay.

This design incorporated stone floors, marble stairs and polished plaster walls; all finishes that on their own, would turn the space into a sonic battleground.  Macaulay Sinclair specified Oscar Acoustics’ SonaSpray fcx acoustic spray at 12mm thick for the ceiling finish which was applied onto a plasterboard ceiling and bulkhead.  At 12mm thick, this was enough to take the edge of the noise and make speech clearer but not enough to kill the atmosphere.  Unlike the majority of acoustic finishes, it is possible to adjust the spray depth of the SonaSpray acoustic spray range’s depth so as to fine tune the acoustics to suit every project and brief.

Credit to John Carey Photography

Colchester Visual Arts Centre

First Site employed Uruguayan-New Yorker Rafael Viñoly with the brief of creating a landmark visual arts centre to put Colchester on the worlds art stage. Like it or loath it, the building sits boldly amongst the buildings of the UKs oldest recorded city attracting strong opinions on both sides. Perhaps this is the sign of a great building, as a building that gets people talking is one that promotes itself.

The inside is no different with its timber floor, minimal white walls and special acoustic ceiling that appears as conventional plaster from the ground.

This special acoustic ceiling was SonaSpray fcx acoustic spray, a sprayed and then trowelled, recycled, seamless, architectural acoustic finish that is through coloured, negating the need for decoration. A minimal space like this would normally be extremely reverberant; instead the feeling is more of a giant space that is lined with plush carpets or soft furnishings.

A leading acoustic consultant commented when told the ceiling was SonaSpray fcx:

"I was there last weekend with my wife and actually commented to her that the space was extremely quiet considering it had no absorptive materials. I thought it was plasterboard but this would explain why. It looked great."

3,000m2 of SonaSpray FCX acoustic spray was applied for FireClad and Mace Construction working from MEWPS to cause minimum disruption to the programme. In addition, further areas were treated with super smooth Oscar Elite acoustic plaster at low level in galleries, meeting rooms and offices.

Hope Academy

Hope Academy near Warrington was a BSF Willmott Dixon design & build project. Outside acoustic consultation lead to Oscars SonaSpray fcx acoustic spray being specified for the prominent, giant feature yellow pods in the main meeting 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.

The giant pods were constructed using ply in ribbed formation. Oscar Acoustics then applied SonaSpray fcx acoustic spray at 20mm & trowelled smooth. The SonaSpray range is able to follow the existing lines of nearly any shape making it possible to add school acoustics absorption without compromising design; architects and designers can now let their minds run wild.

SonaSpray fcx Technical Specification

  Download BIM Object

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 0.07 0.39 0.69 0.83 0.87 0.50
10mm 0.11 0.46 0.77 0.84 0.89 0.55
12mm 0.16 0.49 0.89 1.03 0.97 0.65
20mm 0.48 0.81 0.85 0.85 0.94 0.75

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.

Thermal DATA:

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.

Condensation Control:

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

RH Control:

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


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

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 flangless 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.

Fire Performance Ratings:

UK Fire test by Warrington Fire Research:
Class 1 to BS476 Part 7
Class 0 to BS476 Part 6


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.

What people say about our SonaSpray 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. 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."

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

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