Home > Companies > Knauf Insulation Ltd > Earthwool® Building Slab RS45

Earthwool® Building Slab RS45 is a light to medium density multi-purpose, non-combustible rock mineral wool slab for use in a variety of thermal and acoustic applications from domestic housing to building services. Earthwool® Building Slab RS45 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.

Related literature

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Standard product features


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

Thermal conductivity:

0.035 W/mK.

Fire performance:

Euroclass A1 to BS EN ISO 13501-1.


A+ generic BRE Green Guide rating.


Earthwool® Building Slab RS45 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.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
90-90-40/340 Mineral wool slabs insulation

Product specification

An important note about specifying



Knauf Insulation Ltd


+44 (0)1744 766 666

Product reference

Earthwool® Building Slab RS45


[25 mm]
[30 mm]
[40 mm]
[50 mm]
[60 mm]
[75 mm]
[100 mm]
[150 mm]

Manufacturer details

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