Isocheck 27C, 23C & 14C Systems : overlay platform system for concrete floors

Isocheck PRIMO & PRIMO HL Isocheck ULTIMO Isocheck 32T Isocheck 37T Isocheck 27C, 23C & 14C Isocheck 28T, 24T & 15T Isocheck RENOVO Isocheck Deep Batten Isocheck Shallow Batten Isocheck Cradle Isocheck Barrier Mat 5 & 10 Isocheck Impact Mat 100, 200 & 300 Isocheck Re-Mat 3 & Re-Mat 5 Isocheck Re-Mat Base 3 & 6 Isocheck Re-Cork 3 & Re-Cork 5 Isocheck Screedcheck XL5 Isocheck Screedcheck XL8 Isocheck Screedcheck XL10 Isocheck Phonewell Isocheck Absorba ceiling & wall panels Isowave System 23 for Walls Isowave System 23 for Ceilings Accessories

product data sheet
installation instructions

NHBC Tested

0845 838 3399


•  New build
•  Refurbishments
•  Conversions
•  Robust Detail compliant

Isocheck 27C, 23C &14C systems are designed to reduce sound transmission and also reduce impact sound transmission through concrete floors.

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 a complete 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 and 2013.


To be used over concrete floors for conversions, refurbishments or new build with a new ceiling as illustrated.

Performance (on the constructions illustrated)

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 EFC-1, EFC-2 and EFS-1.

Compliance with Code for Sustainable Homes is possible; please contact Isomass for design advice.

Product data

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


Isocheck 27C
Isocheck 23C
Isocheck 14C
22.8kg per sheet
18.8kg per sheet
5.15kg per sheet


The acoustic floor shall be:

Isocheck 27C, 23C or 14C, 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 27C, 23C or 14C over dry level screed, 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 27C, 23C and 14C 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 27C, 23C and 14C floating floor system.



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  • Isocheck 27C, 23C or 14C.
  • ≥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).




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