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Earthwool® Building Slab RS140

Earthwool® Building Slab RS140

Third party certifications:
  • QA Certificate

    QA Certificate

    Certificate type

Knauf Insulation Ltd

An extra dense, multi-purpose, non-combustible Rock Mineral Wool slab for use in a variety of thermal and acoustic applications.

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+44 (0)1744 766 666 www.knaufinsulation.co.uk

Earthwool® Building Slabs are non-combustible Rock Mineral Wool slabs, manufactured using ECOSE® Technology in a range of densities.

The product is manufactured with a density of 140 kg/m³, designed for use in a variety of applications including internal partitions, timber and metal studs, in between timber rafters and floor joists.

Features and benefits:

  • Good thermal performance.
  • Non-combustible A1 Euroclass Reaction to Fire classification.
  • Good sound absorption characteristics provide high levels of sound reduction.
  • Multi-purpose product range which can be used to insulate a wide range of applications on site.
  • Available in a wide range of densities to suit a variety of uses, applications and performance requirements.
  • Easy to cut with a large bladed knife or saw.

General information

Slab length: 1200 mm

Slab width: 600 mm

Uniclass 2015
Pr_80_77_76_53 Mineral wool duct slab insulationPrimary

H11/780 Thermal insulation

P10/250 Insulation supported between floor joists

P10/50 Insulation supported between joists

Specification data - Mineral wool duct slab insulation
Product Reference

Earthwool® Building Slab RS140

Earthwool® Building Slab RS140 Foil Faced

Earthwool® Building Slab RS140 Tissue Faced

Earthwool® Building Slab RS140 Water Repellent Grade


30 mm

40 mm

50 mm

75 mm

100 mm

Standard product features


  • Slab length: 1200 mm.
  • Slab width: 600 mm.

Thermal conductivity:

0.034 W/mK.

Fire performance:

Euroclass A1 to BS EN ISO 13501-1.


`B` generic BRE Green Guide rating.

Product Options

Product reference:

The product is supplied un-faced, but it can also be manufactured with a factory applied foil or tissue facing and is also available in a water repellent grade.

Third party certifications
  • Eurofins Gold Certificate for Indoor Air Comfort
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