Specialist Acoustic Floor System For Timber Flooring UK

Isocheck 28T, 24T, 18T & 15T

Acoustic floor systems: direct to timber floors

Isocheck 28T, 24T, 18T & 15T are high performance acoustic floor systems designed to reduce impact sound transmission through traditional timber floors where no additional precautions are required for higher domestic loads in bathrooms and kitchens.

Isocheck 28T, 24T and 18T consist of a 6mm layer of Isofiba bonded to 22mm, 18mm or 12mm P5 V313 moisture resistant chipboard, whereas Isocheck 15T consists of a 6mm layer of Isofiba bonded to 9mm moisture resistant medium density fibreboard.

When installed as part of an Isomass approved separating floor construction either system enables a traditional timber joisted floor to meet the sound transmission standards of Approved Document E 2003 and subsequent amendments in 2004, 2010, 2013 and 2015.

View more technical information and downloads

To be used over existing floorboards for conversions, refurbishments or new build with a decoupled ceiling as illustrated or approved by Isomass (on application to technical@isomass.co.uk for our free acoustic detail design service). Isocheck 15T has also been tested for use over water-fed underfloor heating systems.

Treated floor with: R,w+ Ctr DnT,w+ Ctr L’n,w L’nT,w
Isocheck 28T 57dB 50dB 48dB 55dB
Isocheck 24T 56dB 49dB 48dB 55dB
Isocheck 18T 55dB 48dB 46dB 53dB
Isocheck 15T 55dB 48dB 45dB 52dB

Site results (in red) for Building Control approval.
Laboratory results (in blue) for comparison.

Overall size: Isocheck 28T
Isocheck 24T
Isocheck 18T
Isocheck 15T
2400mm x 600mm x 28mm
2400mm x 600mm x 24mm
2400mm x 600mm x 18mm
1200mm x 600mm x 15mm
Resilient layer thickness: 6mm
Resilient layer: Recycled Isofiba
Weight: Isocheck 28T
Isocheck 24T
Isocheck 18T
Isocheck 15T
23.0kg per sheet
19.0kg per sheet
13.0kg per sheet
5.2kg per sheet

Isocheck 28T, 24T, 18T or 15T acoustic flooring, supplied by Isomass Ltd. Unit 14 Papworth Business Park, Stirling Way, Papworth Everard, Cambridgeshire CB23 3GY and installed in accordance with manufacturer’s instructions / recommendations.

Full installation instructions for Isocheck 28T, 24T, 18T and 15T are available as a pdf to download. Go to the Downloads tab on this page.

Isocheck 28T, 24T, 18T & 15T Installation instructions


Isocheck 28T, 24T, 18T & 15T product data sheet

  • Isocheck 28T, 24T, 18T or 15T acoustic flooring.
  • floorboards.
  • 200mm x 70mm timber joists @ 450mm centres.
  • 100mm 45Kg/m3 insulation between joists.
  • 20kg/m2 double boarded 25mm o/a plasterboard on resilient bars @ 400mm centres perpendicular to joist direction.

Isocheck 15T has been independently heat-flow tested and showed the following ratings:

Thermal conductivity: 0.069W/mK

Thermal resistance: 0.203m2K/W

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