Specialist Acoustic Floor System For Timber Flooring UK

Isocheck Isomat 7

Underboard treatment to reduce sound transmission through traditional timber floors.

The isocheck Isomat 7 is a low deflection underboard treatment to reduce sound transmission through traditional timber floors.

Isocheck Isomat 7 consists of a 6mm layer of Isofiba bonded to performance enhancing barrier membrane. This membrane is placed surface up to receive t&g 18mm or 22mm chipboard, OSB, MDF or Plywood.

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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Isocheck Isomat 7 can used over existing floorboards for new build, refurbishments, conversions or listed buildings requiring minimal structural change with an Isoblock and Isobar ceiling system.

Treated floor with:

Isomat 7 + 22mm t&g floor
R,w+ Ctr

DnT,w+ Ctr



Isomat 7 + 18mm t&g floor 58dB 51dB 45dB 52dB
Isomat 7 + 9mm t&g floor 56dB 49dB 43dB 50dB

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

Overall tile size: 1200mm x 1000mm x 7mm
Resilient layer: 5.5mm Isofiba
Weight: 2.5kg per tile

Isocheck Isomat 7 system, supplied by Isomass Ltd. Unit 14 Papworth Business Park, Stirling Way, Papworth Everard, Cambridgeshire CB23 3GY and installed in accordance with manufacturer’s instructions / recommendations.

Apply Isocheck Acoustic Angled Flanking Band against the perimeter wall to ensure the Isomat 7 and board finish are isolated from the wall.

Lay Isocheck Isomat 7 over a structural timber sub-floor. Push the Isomat 7 up to the Flanking band and butt-join all Isomat 7 panels together.

Apply the selected t&g flooring. Glue all joints with Isocheck or another appropriate adhesive.

Turn down the Flanking Band. Install the skirting and trim off excess Flanking Band.

A detailed (project specific) section drawing can be supplied FOC for additional guidance, upon receipt of the existing structural floor and adjacent wall details.

Isocheck Isomat 7 product data sheet

  • Isocheck Isomat 7 under t&g particle board panels.
  • Floorboards.
  • Min. 200mm x 70mm joists @ 450mm centres with min. 100mm 45kg/m3 insulation between joists.
  • Isoblock & Isobar system fitted to joists at max. 600mm centres and 150mm from edges.
  • Min. 20kg/m2 double boarded 25mm o/a plasterboard.

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