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RS45 Building Universal Slab Insulation from Knauf Earthwool 50mm - 7.20m2 Pack

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Product Description

Earthwool building slab RS45 formerly known as universal slab is a rock mineral wool slab which offers both thermal and acoustic insulation for use in a variety of building applications such as internal partitions, timber and metal studs as well as between timber rafters and floor joists.

Earthwool Building Slabs are a range of rigid and semi-rigid, resilient, non-combustible rock mineral wool slabs, available in densities from 33 to 140kg/m3. The standard products are supplied un-faced, but they can also be manufactured with a factory applied foil or tissue facing, they are also available in a water repellent grade.


Length: 1.2m.
Width: 600mm.
Pack quantity: 10x slabs.
Pack coverage: 7.2m2.
Thickness: 50mm.
Thermal conductivity: 0.035W/mK.
Thermal resistance: 1.40m2K/W.


Earthwool Building Slabs are odourless, rot proof, non-hygroscopic, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.


Universal Slabs are free from CFCs, HCFCs and any other material with ozone depletion potential in their manufacture and content and represent no known threat to the environment.

Fire Peformance

Earthwool Building Slabs are classified as Euroclass A1 to BS EN 13505-1, non-combustible to BS 476:Part 4:1970 (1984) and, Class 1 Surface Spread of Flame to BS 476:Part 7:1997 and Class ‘O’ to the Building Regulations.

Vapour resistance

Earthwool Building Slabs offer negligible resistance to the passage of water vapour and have a water vapour resistivity of 5.00MNs/g.m.


Earthwool Building Slabs are manufactured in accordance with BS EN 13162, ISO 50001 Energy Management Systems, OHSAS 18001 Occupational Health and Safety Management Systems, ISO 14001 Environmental Management Systems, and ISO 9001 Quality Management Systems, as certified by Bureau Veritas.

Product Documents


WIDTH 600mm LENGTH 1200mm THICKNESS 50mm


Thermal Conductivity 0.035 W/mK Material Mineral Wool Application Between Rafter
Internal Walls
Product Type Slab
Features Acoustic
Fire Protection
Fire Performance Class 1

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RS45 Building Universal Slab Insulation from Knauf Earthwool 50mm - 7.20m2 Pack

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