Reduce Sound Transmission With Monodeck 20T

Monodeck 20T

Monodeck 20T system is designed to reduce transmission through timber floors in situations where finished floor height is critical.

Monodeck 20T boards consist of a layer of 8mm reconstituted ACF (Acoustic Chip Foam) bonded to 12mm p5 moisture resistant chipboard.

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 & 2015.

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To be used over existing floorboards for conversions, refurbishments or most decoupled ceilings in new build projects.

Treated floor with:
Monodeck 20T
R,w+ Ctr
DnT,w+ Ctr
Impact improvement 18dB ΔLw

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

Overall size: 2400mm x 600mm x 20mm
Resilient layer thickness: 8mm
Resilient layer material: Reconstituted ACF (Acoustic Chip Foam)
Resilient layer fire test: Tested to BS 5852-2:1982
Weight: 11.8kg per sheet

Monodeck 20T, 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.

Full installation instructions for Monodeck 20T is available as a pdf to download. Go to the Downloads tab on this page.

Monodeck 20T product data sheet


Monodeck 20T installation instructions

  • Monodeck 20T system on existing timber floor (subject to condition) or a new 18mm chipboard deck.
  • 200mm x 50mm timber joists@ max. 450mm centres.
  • 100mm 45kg/m3 insulation between joists.
  • Min. 20kg/m2 double boarded ceiling on resilient bars @400mm centres perpendicular to joist direction.
  • Acoustic flanking band reduces impact vibration leaking via structural walls and assists in reducing airborne sound paths.

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