SonaSpray K-13

Noise reduction spray

NBS Plus RIBA Product Selector NBS BIM RIBA CPD Providers Network

Spray-on, seamless, decorative acoustic wall & ceiling finish

Request a SonaSpray quotation

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 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 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.

Request a SonaSpray Brochure

Noise reduction spray

Winter Gardens Pavilion, Weston-Super Mare. Photo credit to Mitch Duncan Photography

Features & benefits of SonaSpray K-13 noise reduction insulation

  • For Building Materials emissions this noise reduction spray achieves M1 certification.
  • Offers excellent reverberation noise reduction in 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 Leadership in Energy and Environmental Design (LEED) rating of a project.
  • Can be applied to virtually any configuration of substrate.
  • The adhesive provides a resilient bond that is strong and durable.
  • Contributes to condensation and humidity control by absorbing large amounts of water vapour and releasing it when the humidity levels drop, promoting a healthy and well balanced environment.
  • Insulates by creating dead air macroscopic spaces between and within the hollow cellulose fibres.

Noise reduction insulation

Nottinghill Prep School - Credit 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 Installations

Notting Hill Prep School Acoustics

Notting Hill Prep School Acoustics

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.

Winter Gardens Pavillion

Winter Gardens Pavillion

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. We have a range of 5 acoustic finishes from textured to the smoothest acoustic plaster available.
Photo credit to Mitch Duncan Photography.
View Architects & Midas Construction

Investec office acoustics

Investec office acoustics

International Specialist Banking and Asset Management Group offices in the City of London received an office refurbishment in 2018.  The fit out & refurbishment experts We Are BW 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.

Ice Arena Wales

Ice Arena Wales

6,200 m2 of SonaSpray K-13 in white applied to plasterboard and profiled deck at Cardiff Ice Arena for Kier Construction.  SonaSpray aids in condensation and humidity control by absorbing water vapour then releasing it when humidity levels drop, promoting a healthy and balanced atmosphere.  SonaSpray reduces ventilation requirements with potential savings in equipment and operating costs too. 

Arlington Business Park café acoustics

Arlington Business Park café acoustics

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 Arlington Business Park's ground floor and cafe by Bulb Interiors.

Dome & O2 Arena, Greenwich, London

Dome & O2 Arena, Greenwich, London

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.

The Enterprise Centre - University of Anglia

The Enterprise Centre - University of 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, Manchester

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. 

Bath College Construction Skills Centre

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.  

King Ethelbert School

King Ethelbert School

Each project is individual; for King Ethelbert School in Kent, acoustic measurements were taken and with purpose designed software an acoustic computer model of the sports hall was created.  This enabled Oscar Acoustics to calculate which areas required treatment to achieve the desired school acoustics.

Auditorium acoustics

Auditorium acoustics

During the recent refurbishment of The Windsor Hall at the Bournemouth International Centre, improved auditorium building acoustics was a major requirement.

Sports hall acoustics

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 has a distinct advantage over acoustic panels in this situation.

More SonaSpray K-13
The Royal Observatory
House of Blues
Concert hall acoustics
House of Blues, Chicago
Manor Drive Methodist Church
Bournemouth International Centre
Seattle Kingdome

SonaSpray K-13 Technical Specification

Technical Information

   Download BIM Object

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

in mm
16mm 0.14 0.43 0.93 0.95 1.05 1.14 0.85
25mm 0.16 0.54 0.95 0.98 1.05 1.06 0.90
38mm 0.20 0.66 1.09 1.04 1.05 1.06 0.95
50mm 0.27 0.75 1.01 1.01 1.06 1.08 1.00
57mm 0.31 0.89 1.02 1.02 1.01 1.02 1.00
70mm 0.37 1.10 1.15 1.11 1.09 1.13 1.00
76mm 0.49 1.04 1.07 1.07 1.05 1.09 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.

Ideal for rain noise reduction


SonaSpray K-13 achieves M1 certification for Building Material emissions. This is the best possible classification. Click here for certificate.

Thermal DATA

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


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. Fully cured SonaSpray K-13 will improve strength.

Condensation control

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

RH control

SonaSpray K-13 noise reduction insulation is a natural humidity moderator. At times of increasing humidity SonaSpray K-13 will absorb large amounts of water vapour. When the humidity drops SonaSpray K-13 will exhale water vapour and maintain a balance. This characteristic promotes a healthy atmosphere.


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.

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 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.

Fire performance ratings

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

European test by Warrington Fire Research:

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

Contact Us

Send us a message using the form below and a member of the Oscar Acoustics team will be in touch.

If you would like us to call you back please make sure to enter your phone number.

Something big is coming... Don't miss out!

Would you like to receive exciting updates and new product information from Oscar Acoustics no more than 2-4 times per year?

If so, please join us by ticking