• Isomass Ltd – Incorporated 2006

Isocheck ULTIMO

Acoustic floor system: for timber or concrete floors

The Isocheck ULTIMO system is designed to reduce sound transmission through traditional joisted timber floors, where access to ceilings may be limited.

Isocheck ULTIMO consists of 5 – 6mm Isofiba resilient layer bonded to 10mm fibre reinforced gypsum board, with a bonded top layer of 9mm thick t&g moisture-resitant board.

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.

View more technical information and downloads

To be used directly over existing floorboards in conversions, new build and listed building projects. Suitable for projects which include directly-fixed or low-mass ceilings, for example, flats over commercial properties or timber frame flats. Could be installed as illustrated or approved by Isomass (on application to technical@isomass.co.uk for our free acoustic detail design service).

Treated floor with:
Isocheck ULTIMO on 18mm floorboards
R,w+ Ctr
DnT,w+ Ctr

Site results (in red) for Building Control approval.
Laboratory results (in blue) for comparison.

Overall size: 1200mm x 600mm x 24mm
Resilient layer thickness: 5 – 6mm
Resilient layer material: Isofiba
Weight: 18.6kg/m2  (13.4kg per sheet)

Isocheck ULTIMO 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 ULTIMO are available as a pdf to download. Go to the Downloads tab on this page.

Isocheck ULTIMO Installation instructions


Isocheck ULTIMO product data sheet

  • Isocheck ULTIMO acoustic flooring.
  • floorboards.
  • 200mm x 70mm timber joists @ 450mm centres.
  • 100mm 45g/m3 insulation between joists.
  • 25mm o/a double boarded ceiling or Lath & Plaster ceiling (min 20kg/m2) fixed to timber joists.
  • acoustic flanking band reduces impact vibration leaking via structural walls and assists in reducing airborne sound paths.

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 ULTIMO 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.

Click here to view in a new tab DOWNLOAD BIM FILE

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

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