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Earthwool® Flexible Slab is a lightweight, multi-purpose, flexible, friction-fit rock mineral wool slab for use in a wide variety of thermal and acoustic applications such as internal partitions, between timber and metal studs, rafters and floor joists. Earthwool® Flexible Slab is 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.

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Standard product features


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

Thermal conductivity:

  • 140 mm: 0.034 W/mK.
  • All other thicknesses: 0.037 W/mK.

Fire Performance:

Euroclass A1 to BS EN ISO 13501-1.


A+ generic BRE Green Guide rating.

NBS Specification

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This product is associated with the following NBS Create clause:
45-80-40/400 Sound attenuators

Product specification

An important note about specifying



Knauf Insulation Ltd


+44 (0)1744 766 666

Product reference

Earthwool® Flexible Slab


[40 mm]
[50 mm]
[60 mm]
[70 mm]
[90 mm]
[100 mm]
[140 mm]

Manufacturer details

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