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

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Call us on 0845 838 33 99 or get in touch for more information