Isocheck 27C, 23C & 14C

Acoustic floor systems: for concrete floors
Isocheck 27C, 23C & 14C acoustic floor systems are designed to reduce impact sound transmission through concrete floors, this system does not need the additional protection of a moisture barrier (VCL) vapour control layer because the Isopoli will not absorb the moisture from a virgin screed.


Isocheck 27C and 23C consists of a 5.5 mm layer of cross-linked Isopoli bonded to 18mm P5 V313 moisture resistant chipboard, whereas Isocheck 14C consists of a 5.5 mm layer of cross-linked ‘Isopoli’ bonded to 9mm moisture resistant medium density fibreboard.


When installed as part of an Isomass approved party floor construction it enables a concrete 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 concrete floors for conversions, refurbishments or new build with a new ceiling as illustrated or approved by Isomass (on application to for our free acoustic detail design service).


Treated floor with:
DnT,w+ Ctr
Isocheck 27C
Isocheck 23C
Isocheck 14C

based upon the typical construction examples
Complies with New Build Robust Detail descriptive FFT5 within E-FC-1, E-FC-2 and E-FS-1.

Overall size: Isocheck 27C
Isocheck 23C
Isocheck 14C
2400mm x 600mm x 27mm
2400mm x 600mm x 23mm
1200mm x 600mm x 14mm
Resilient layer thickness: 5.5mm
Resilient layer: Isopoli cross linked foam
Weight: Isocheck 27C
Isocheck 23C
Isocheck 14C
22.8kg per sheet
18.8kg per sheet
5.15kg per sheet

Isocheck 27C, 23C or 14C 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 27C, 23C and 14C are available as a pdf to download. Go to the Downloads tab on this page.

  • Isocheck 27C, 23C or 14C acoustic flooring.
  • ≥300kg/m2 cast in-situ concrete with 80kg/m2 sand/cement screed or 40mm proprietary screed.
  • min. 75mm void formed by metal frame suspended ceiling system plus ≥10kg/m2 gypsum board ceiling (left) or
  • 50 x 75mm timber battens supporting 10kg/m2 gypsum board ceiling supported on resilient bars @ 400mm centres, perpendicular to the battens min. 75mm below underside of sub-floor (right).
Isocheck 27C, 23C and 14C application section
Isocheck 27C, 23C and 14C

Isocheck 27C, 23C & 14C Installation instructions

Isocheck 27C, 23C & 14C product data sheet


Isomass have a large number of products available as BIM Components on the Bimstore website. These are digital files which contains information about a real-world physical building component or material that is used in the construction process.


The BIM file for Isocheck 27C, 23C and 14C can either be downloaded directly from this page by clicking on the download button, or can be downloaded from the bimstore (link on the right), where other isomass products are also available and can be downloaded as a collection.

Note: all BIM Components are in the Revit (.rvt) file format.

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