Isocheck 37T System : direct to joists system

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product data sheet
installation instructions

NHBC Tested

0845 838 3399


•  New Build
•  Refurbishments
•  Conversions
•  Listed buildings requiring minimal structural change

The isocheck 37T system is designed to replace floorboards and reduce sound transmission whilst thermally enhancing traditional joisted timber floors.

Isocheck 37T consists of 10mm reconstituted ACF (acoustic chip foam) and the added isolation of a 5mm Isofiba layer, 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 directly on timber joists for conversions or when using a direct fix ceiling.

Typical performance expectations (on the construction illustrated)

Treated floor with:

Isocheck 37T with a
boarded 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 37mm
Resilient layer thickness: 10mm
Resilient layer material: 10mm reconstituted ACF (acoustic chip foam) plus 5mm Isofiba
Weight: 23.6kg per sheet


The acoustic treatment shall be:

Isocheck 37T, 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 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 37T directly to the timber joists, 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 37T 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 37T 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.

Note: Existing Lath & Plaster ceilings may require fireproofing.


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Isocheck 37T

  • Isocheck 37T.
  • 200mm x 70mm timber joists @ 450mm centres.
  • 100mm 45kg/m3 insulation between joists.
  • Lath & Plaster ceiling or 30mm o/a double boarded ceiling (min. 20kg/m2) fixed to timber joists.
  • Note: Tested only with direct fixed ceilings.
  • Note: Additional floor support may be required - commonly in the form of additional noggins.






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