Isocheck 28T, 24T & 15T Systems : overlay platform system direct to floorboards

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product data sheet
installation instructions

NHBC Tested

0845 838 3399

Manufactured with recycled Isofiba
Suitable for: E1 - new build E1 - material change of use

•  Conversions
•  Refurbishments
•  New build

Isocheck 28T, 24T & 15T are high performance systems designed to reduce sound transmission through traditional joisted timber floors.

Isocheck 28T and 24T consist of a 6mm layer of Isofiba bonded to 22mm or 18mm 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 a complete party 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 and 2013.


To be used over existing floorboards for conversions, refurbishments or new build with a new resilient bar ceiling.

Performance (on the construction illustrated)

Treated floor with:
DnT,w+ Ctr
Isocheck 28T
Isocheck 24T
Isocheck 15T

Product data

Overall size: Isocheck 28T 2400mm x 600mm x 28mm
  Isocheck 24T 2400mm x 600mm x 24mm
Isocheck 15T 1200mm x 600mm x 15mm

Resilient layer thickness:   6mm

Resilient layer:   Isofiba

Weight: Isocheck 28T 23.0kg per sheet

  Isocheck 24T 19.0kg per sheet

  Isocheck 15T 5.2kg per sheet


The acoustic floor shall be:

Isocheck 28T, 24T or 15T, supplied by Isomass Ltd.
St Johns Innovation Centre, Cowley Road, Cambridge,
CB4 0WS and installed in accordance with manufacturer’s instructions / recommendations.


Apply Isocheck Acoustic Angled Flanking Band on the edges of the Isocheck boards just before they are pushed against the perimeter walls to isolate the board from the wall.

Lay Isocheck 28T, 24T or 15T over a structural timber sub-floor, in brick bond pattern, applying Isocheck adhesive to all tongued and grooved panel joints.

Install skirting and trim off excess Flanking Band.

Full installation instructions for Isocheck 28T, 24T and 15T are available to download by clicking on the link to the left of this page. Installation instructions must be used in conjunction with this information and/our information contained in the datasheet when laying the Isocheck 28T, 24T and 15T floating floor system.



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Deck 24T

  • Isocheck 28T, 24T or Isocheck 15T.
  • 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.




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