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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 140kg/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 ODP and Zero GWP.

Related literature

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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.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-70/385 Mineral wool slab insulation

Product specification

An important note about specifying



Knauf Insulation Ltd


+44 (0)1744 766 666

Product reference

Earthwool® Acoustic Floor Slab Plus


[25 mm]
[50 mm]

Manufacturer details

Knauf Insulation,
Stafford Road,
St Helens,
Merseyside, WA10 3LZ
Tel +44 (0)1744 766 666
NBS Plus