SonaSpray K-13 acoustic spray

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Spray-on, fire rated, seamless, decorative acoustic wall & ceiling finish.

SonaSpray K-13 - Decorative acoustic wall and ceiling noise reduction spray

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Noise reduction insulation spray
  • A spray applied seamless one coat acoustic decorative finish
  • Easily applied to flat or curved surfaces
  • Reverberation noise reduction
  • Rain noise reduction
  • Thermal noise reduction insulation and aids in condensation control
  • Our SonaSpray range has finishes from textured to plaster smooth
  • Typically provides all the above features at lower installed prices than fixed panel systems

SonaSpray K-13, fire rated, noise reduction insulation is spray applied directly to most substrates: concrete, plasterboard, GRP, steel, glass, expanded polystyrene.  Domes, vaults, profiled, corrugated, flat; in fact any shaped substrate can be sprayed with SonaSpray K-13 noise reduction insulation.

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SonaSpray K-13 - Decorative acoustic wall and ceiling noise reduction spray installed in Winter Gardens Pavillion

SonaSpray K-13 noise reduction insulation spray in Winter Gardens Pavilion, Weston-Super Mare.  Mitch Duncan Photography.

Benefits of SonaSpray K-13 noise reduction insulation

SonaSpray K-13 noise reduction insulation

SonaSpray K-13 applied directly onto rib deck and beams in mid-grey throughout Investec offices.
Credit to TP Bennett & BW Workplace Experts.

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

Fire rated

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

SonaSpray's Class 0 to BS476 & B-s1,d0 fire rating provides 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 below for more information on the fire properties of SonaSpray and the new Approved Document B requirements.

View full SonaSpray fire ratings

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

SonaSpray K-13 vs. Sprayed Fiberglass video - Comparative Fire Endurance Test 

This test was conducted to evaluate the fire performance and endurance qualities of two different spray applied materials used as exposed thermal and acoustical finishes. The test materials were SonaSpray K-13, a cellulose material, and sprayed fiberglass. The test was conducted using the ASTM E-119 Standard for Fire Tests of Building Construction and Materials.

View fire endurance test on YouTube

SonaSpray K-13 noise reduction insulation testimonial

Dubbed by the press as the UK's greenest building, The Enterprise Centre at the University of East Anglia was designed and delivered by Architype and Morgan Sindall Construction to achieve the Passivhaus standard and a BREEAM outstanding rating.  SonaSpray K-13 noise reduction insulation was spray applied in light grey and white throughout the building in the lecture theatres and corridors and contributed to the green project perfectly.

“Everyone loves the finish!  Second to the exterior thatch, it is the most asked about and photographed material in the building.

During our regular tours, people are always asking what it is and what it is for.  They love that fact that it has a purpose and is on show so they can see how the building works".

Fergus Rolfe - Team Manager
The Enterprise Centre Commercial Services

SonaSpray K-13 - Decorative acoustic wall and ceiling noise reduction spray installed in Nottinghill Prep School

SonaSpray K-13 noise reduction insulation in Notting Hill Prep School - Hanson Architects & Davide Saibene photography.

Available in a range of standard colours from stock, K-13 noise reduction insulation can also be specially manufactured to the client’s colour requirement (minimum quantity applies).

SonaSpray K-13 noise reduction insulation is a total system with in-built treatment for fire and mould resistance and has colouring throughout the full thickness of the coating. 

Future reconstruction of buildings may require removal of SonaSpray.  It can be recycled or disposed of as a non-special waste and your local authority waste disposal will be able to give advice on recycling.

  • Carbon neutral.
  • Low embodied energy.
  • Good for the environment & recyclable.
  • Safe, recycled, natural cellulose fibre.

Contact us

For more information regarding our noise reduction insulation 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

Manufacture is accredited ISO 9001: 2000 Certification.


SonaSpray K-13 acoustic spray installations

Office acoustics at Radius Payment Solutions’ HQ

Radius Payment Solutions’ HQ

We applied SonaSpray K-13 in grey to some of the breakout spaces and gym in Radius Payment Solutions new HQ.  This fire-rated, acoustic ceiling spray was used to provide a seamless and decorative solution.  More importantly it also absorbs noise, thus creating a pleasant ambience.

Acoustic treatment in Ice Arena

Ice Arena Wales

7,500 m2 of SonaSpray K-13 in white applied to plasterboard and profiled deck at Cardiff Ice Arena for Kier Construction. SonaSpray reduces ventilation requirements with potential savings in equipment and operating costs too. 

Notting Hill Prep School - School Acoustics

Notting Hill Prep School

This unique project is the first ever school building to be built under a motorway. The technical challenges were considerable and involved forming an independent, acoustically separated structure below the concrete framed Westway, next to the Hammersmith and City tube line. SonaSpray K-13 in mid-grey was applied onto concrete and plasterboard at 25mm thick to control reverberation, give clarity to sound and reduce overall noise levels.

Improving the office acoustics at Investec in London


International Specialist Banking and Asset Management Group offices in the City of London received an office refurbishment in 2018.  BW Workplace Experts were considering how to preserve the existing rib deck ceilings with beams throughout whilst solving the office acoustic issues.  Our SonaSpray K-13 was applied throughout and is the perfect solution for reverberation control within offices.

Club acoustics - Winter Gardens Pavilion

Winter Gardens Pavilion

SonaSpray K-13 applied over a reinforcement mesh during the refurbishment of the Winter Gardens Pavilion, Weston-Super Mare in order to acoustically treat and decorate for excellent club acoustics.  We have a range of 5 acoustic finishes from textured to the smoothest acoustic plaster available.

Credit to View Architects, Midas Construction & Mitch Duncan Photography.

Arlington Business Park café acoustics

Arlington Business Park café

SonaSpray K-13 in black was spray applied above slatted timber by one of our in house expert teams to acoustically treat the ceiling during this fit out of the award winning Arlington Business Park and cafe by Bulb Interiors.

Stadium Acoustics - Dome & O2 Arena, Greenwich, London

Millennium Dome & O2 Arena

When The Millennium Dome made the change into the O2 Dome, there was a need once again for acoustic ceiling and wall treatment in some of the main public areas. Oscar Acoustics were already familiar with the Millennium Dome, having undertaken three separate projects for the original exhibition before.

University of East Anglia - University Acoustics

University of East Anglia

The SonaSpray range has been included in some of the UK’s greenest projects, including The Enterprise Centre at the University of East Anglia, which was dubbed by the press as ‘the UK’s Greenest Building’. This project achieved Passivhaus standard, BREEAM outstanding rating and 31 accolades including RIBA Sustainable Project of The Year, BREEAM Awards Best Education Project and Passivhaus Trust Award. 

Byron Burger, Piccadilly Gardens, Manchester - Restaurant Acoustics

Byron Burger, Manchester

SonaSpray K-13 noise reduction spray in black applied to the soffit at the Byron Burger restaurant in Piccadilly Garden, Manchester to control reverberation and refurbish the old ceiling. 

Stadium Acoustics - Seattle Kingdome

Seattle Kingdome

SonaSpray K-13 effectively met all the project requirements.  A 50mm thick coat of specially matched colour K-13 was applied to control the deafening noise generated by fans, improve the lighting and aesthetics of the stadium and proved to be a highly effective noise reduction insulation.

Sports hall acoustics noise control

Sports hall acoustics

Sports hall acoustics are typically reverberant due to a combination of large areas of hard block walls, corrugated steel ceilings and wooden floors.  To control a sports hall acoustics a large amount of acoustically absorptive material has to be applied around the hall.  A spray-on material such as our SonaSpray reverberation control range has a huge distinct advantage over acoustic wall panels in this situation.

Bath College Construction Skills Centre - College Acoustics

Bath College Construction Skills Centre

This state-of-the-art construction skills centre at Bath College is a purpose-built facility accommodating new workshops that cater for 500+ apprentices and students studying bricklaying, construction, carpentry and stonemasonry, as well as plumbing, electrical installation and refrigeration. Without acoustic treatment the noise levels within these spaces would have been uncomfortably high whilst machinery was in use.

SonaSpray K-13 acoustic spray technical specification

Technical information

   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.  
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 K-13 can be tailored to meet your specific project acoustic needs. There is a choice of finish and you can select texture, colour and acoustic performance. SonaSpray K-13 can be applied at variable thickness and variable areas to provide a designed acoustic ambience. It is spray applied to the full thickness in one application.

For the ultimate acoustic combination in sports halls, use SonaSpray K-13 on standard plain non-perforated deck with the new Oscar Evo-Panel at low level. The Oscar Evo-Panel is the first acoustic panel designed specifically for use at low level in high impact areas. Positioning these at low level prevent sound flutter off lower walls meaning you require 35% less Evo-Panels than standard acoustic panels at high level. Sport England compliant.

"Changing spec from standard acoustic panels at high level and replacing perforated metal deck in our sports hall with plain galvinised metal deck treated with SonaSpray K-13 has saved us a fortune & time in the programme. Everyone has commented on how quiet the sports hall is now".

A large well known Main Contractor.

SonaSpray K-13 standard absorption coefficients

16mm 0.10 0.40 0.90 0.95 1.00 1.00 0.85 0.70
25mm 0.20 0.55 0.95 1.00 1.00 0.95 0.90 0.85
38mm 0.20 0.65 1.00 1.00 1.00 1.00 0.95 0.95
50mm 0.35 0.80 1.00 1.00 1.00 1.00 0.95 1.00
70mm 0.40 1.00 1.00 1.00 1.00 1.00 1.00 1.00
76mm 0.50 1.00 1.00 1.00 1.00 1.00 1.00 1.00

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

Ideal for rain noise reduction.

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.


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


SonaSpray insulates by creating dead air spaces macroscopically between and within the hollow cellulose fibres.  Testing on actual buildings demonstrates that sprayed insulation outperforms fibreglass batts that are mechanically retained. 100mm thick U = 0.32 W/m2K

Condensation control

For areas such as indoor pools and ice arenas, SonaSpray K-13 aids in condensation control.  The proper combination of SonaSpray K-13 and ventilation prevents condensation on metal, concrete and other surfaces. SonaSpray K-13 reduces ventilation requirements, saving in both the ventilation equipment investment operating costs.


  • Dry Weight of SonaSpray K-13 per 10mm thickness = 0.72 kg/m2
  • Wet Weight of SonaSpray K-13 per 10mm thickness = 1.37 kg/m2
  • Dry Weight of SonaSpray K-13 per 20mm thickness = 1.44 kg/m2
  • Wet Weight of SonaSpray K-13 per 20mm thickness = 2.74 kg/m2

Bonding to substrate

SonaSpray K-13 noise reduction insulation 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 contaminants whilst the surface is wet.  


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.


The adhesive used with SonaSpray K-13 noise reduction insulation provides a strong, durable and resilient bond.  When fully cured, surface strength of old plaster will typically improve.  Fully cured SonaSpray K-13 can improve 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 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 arise from using other hatches.  These items are at extra cost and are to be purchsed direct from 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

SonaSpray K-13 noise reduction insulation can be quickly and effectively applied to any prepared surface and construction configuration. This allows minimum working down time in existing structures with abilities to meet critical deadlines in new construction. SonaSpray K-13 has a coarse surface texture and is suited to large buildings with longer viewing distances; or use close up where a strong texture is required. Other SonaSpray products offer a finer surface texture. SonaSpray K-13 is also ideal in some cases for rain noise reduction within the building.

USA – Factory Mutual Standards research corp. approvals: category I, II, III, IV and V:

Category_I As an interior finish material of low fire hazard [class I building material] over non-combustible surfaces not requiring automatic sprinkler protection in and of itself.
Category_II As a protective coating to delay the ignition and reduce the surface burn rate of combustible wood and cellulosic fibre building material.
Category_III As a protective coating to delay the ignition and reduce the surface burn rate of low melting point, combustible cellular plastic building materials and to protect their dimensional stability for a brief period.
Category_IV As a protective coating for building structural steel, to supplement automatic sprinkles protection in preventing structural failure temperatures of the steel in high fire hazard occupancies.
Category_V As a protective coating to the underside of a Class II insulated steel roof deck construction, to sufficiently lower the rate of fuel contribution from the Class II deck components to qualify the construction as Class I so allowing automatic sprinkler protection to be omitted under Factory Mutuals Standards.


SonaSpray K-13 noise reduction insulation can be over-painted or applied with additional coats of SonaSpray. Small areas of damage can be repaired by hand.

If SonaSpray K-13 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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