The Underwood Soundproofing Solution For Timber Floors
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Isocheck Underwood

Impact and airborne improvement systems for timber floors

The Isocheck Underwood system is designed to be used under laminate and wood flooring. It is designed to provide resilience, durability and support to protect the floor covering against undue stress.

Isocheck Underwood is a light weight, 3.5mm thick layer of recycled rubber crumb (mainly vehicle tyres) bound together in a unique latex formulation. This high content of recycled raw materials ensures that the product has strong environmental credentials

Isocheck Underwood’s integrated metalised scrim ensures good resistance to moisture transmission thereby eliminating the need for an additional polythene sheet.

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To be used over floorboards or concrete floors for conversions, refurbishments or listed buildings requiring minimal structural change.

(on the constructions illustrated)

Isocheck Underwood will typically achieve up to 26dB ∆Lw in laboratory conditions.

Overall size: 1.00m x 10m roll
Resilient layer: 3.5mm recycled rubber crumb
Weight: 12.6kg per roll (1.2kg/m2)

Isocheck Underwood, 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.

Isocheck Underwood product data sheet

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  • laminate or wood flooring.
  • Isocheck Underwood.
  • floorboards over 200mm x 70mm timber joists @ 450mm centres.
  • 100mm 45kg/m3 insulation between joists.
  • 25mm o/a double boarded 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.

  • laminate or wood flooring.
  • Isocheck Underwood.
  • ≥ 300kg/m2 hollow core concrete with 80kg/m2 sand/cement screed or 40mm screed.
  • min. 75mm void formed by metal frame suspended ceiling system with ≥10kg/m2 gypsum board ceiling (top).

    OR
  • 50 x 75mm timber battens.
  • ≥ 10kg/m2 gypsum board ceiling supported on resilient bars @ 400mm centres, perpendicular to the battens min 75mm below underside of sub-floor.
  • Acoustic flanking band reduces impact vibration leaking via structural walls and assists in reducing airborne sound paths.

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