Isocheck 32T System : direct to joists system (using a resilient bar ceiling)

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product data sheet
installation instructions

NHBC Tested

0845 838 3399

•  New Build
•  Refurbishments
•  Conversions

The Isocheck 32T system is designed to reduce sound transmission and thermally enhance traditional joisted timber floors.

Isocheck 32T consists of 6mm reconstituted ACF (Acoustic chip foam) and 4mm Isofiba, bonded to 22mm P5 V313 moisture resistant chipboard.

When installed as part of a complete sound reduction system, it enables a timber floor to meet the sound transmission regulations of Approved Document E 2003 and subsequent amendments in 2004, 2010 and 2013.


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

Typical performance expectations (on the construction illustrated)

Treated floor with:

Isocheck 32T with a
resilient bar ceiling

R,w+ Ctr
DnT,w+ Ctr

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

Product data

Overall size: 2400mm x 600mm x 32mm
Resilient layer thickness: 10mm
Resilient layer material:

6mm reconstituted ACF
(Acoustic chip foam) and
4mm Isofiba
Weight: 23.0kg per sheet


The acoustic treatment shall be:

Isocheck 32T, supplied by Isomass Ltd. Units 10 & 11, Avenue Business Park, Elsworth, Cambridgeshire CB23 4EY and installed in accordance with manufacturer’s instructions / recommendations.


Apply Isocheck Angled Acoustic 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 32T directly to the timber joists, in brick bond pattern, applying Isocheck adhesive to all tongued and grooved panel joints without the need for mechanical fixings.

Install skirting and trim off excess Flanking Band.

Full installation instructions for Isocheck 32T 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 32T floating floor system.

Please ask Isomass for guidance when considering the weight of any new blocks which will be incorporated in a wall directly surrounding a timber separating floor.


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Isocheck 32T


  • Isocheck 32T.
  • 200mm x 70mm timber joists @ 450mm centres.
  • 100mm 45g/m3 insulation between joists (total ceiling mass 20kg/m2)
  • 20kg/m2 double boarded 25mm o/a plasterboard on resilient bars @ 400mm centres perpendicular to joist direction.





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