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Earthwool® Acoustic Floor Slab Plus

Knauf Insulation Ltd

An extra high density, non-combustible Rock Mineral Wool slab manufactured specifically for use as a resilient layer in separating floors and is typically used beneath particleboard and floor screeds.

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

Earthwool® Acoustic Floor Slab Plus is used for the acoustic insulation of separating floors to meet the requirements of a floating floor treatment in the Robust Details (England and Wales E-FC-1, E-FC-2 and E-FS-1). Earthwool® Acoustic Floor Slab Plus is an extra high density (nominal 140 kg/m³), compression resistant, non-combustible, Rock Mineral Wool slab made with ECOSE® Technology, a no-added formaldehyde binder derived from rapidly renewable materials instead of traditional petro-based chemicals used in other insulation products and is classified as zero ozone depletion potential (ODP) and zero global warming potential (GWP).

Features and benefits:

  • Non-combustible A1 Euroclass Reaction to Fire classification.
  • Good sound absorption characteristics.
  • Significantly improves sound insulation reducing the amount of sound energy transferred from one side of the floor to the other.
  • Products are suitable for use with a range of constructions registered in the Robust Details Handbook.

General information

Slab length: 1000 mm

Slab width: 600 mm

Uniclass 2015 Mineral wool slab insulation (Pr_25_57_06_56)
Specification data
Product Reference

Earthwool® Acoustic Floor Slab Plus


25 mm

50 mm

Standard product features


  • Slab length: 1000 mm.
  • Slab width: 600 mm.

Density (nominal):

140 kg/m³.

Fire performance:

Euroclass A1 to BS EN ISO 13501-1.


`B` generic BRE Green Guide rating.