Isocheck 37T

Acoustic floor system: direct to joists with retained ceilings below
The Isocheck 37T acoustic flooring system is designed to replace floorboards and reduce impact sound transmission through a timber joisted floor where there is little or no access available to enhance the ceiling below for both sound insulation and additional fire protection.


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, 2013 and 2015.

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To be used directly on timber joists for conversions in conjunction with a direct fix ceiling (commonly found in listed buildings or projects where access to the ceiling is not easily accessable) as illustrated or approved by Isomass (on application to for our free acoustic detail design service ).


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.

Overall size: 2400mm x 600mm x 37mm
Resilient layer thickness: 15mm
Resilient layer material: 10mm reconstituted ACF (acoustic chip foam) plus 5mm Isofiba
Weight: 23.6kg per sheet

Isocheck 37T acoustic flooring, supplied by Isomass Ltd. Units 10 & 11, Avenue Business Park, Elsworth, Cambridgeshire CB23 4EY and installed in accordance with manufacturer’s instructions / recommendations.

Full installation instructions for Isocheck 37T are available as a pdf to download. Go to the Downloads tab on this page.

  • Isocheck 37T acoustic flooring.
  • 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.
isocheck 37T acoustic flooring system
isocheck 37T acoustic flooring system

Isocheck 37T Installation instructions

Isocheck 37T product data sheet

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