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Thermafleece CosyWool Slab Insulation


Thermafleece CosyWool slab is a versatile insulation made from 75% British sheep's wool. and 25% recycled polyester A great choice for insulating walls and roofs. Research shows that using 75% wool in combination with recycled fibres outperforms alternative products with a higher percentage of wool.

CosyWool Slabs are flexible but denser than rolls and sized to provide extra tight friction fit in walls and roofs providing excellent thermal and acoustic performance.


  • Thicknesses – 50,75,100,140 mm
  • Widths – 390 & 590 mm
  • Slab Length – 1200 mm, all sizes

Thermafleece CosyWool flexible slabs are harmless and can be installed without gloves or protective clothing, although we recommend you wear a dust mask in enclosed spaces such as lofts. Thermafleece CosyWool is not irritating to the skin, eyes or respiratory tract.

To retain the benefits of water vapour, absorption and release, Thermafleece CosyWool flexible slabs may be used in conjunction with a vapour permeable underlay. Protect the insulation from prolonged exposure to sunlight when unpacked and avoid wetting for extended periods, store under cover and clear of the ground.

Technical Info
Technical Info

Thermal Conductivity: 0.038 Wm-1K-1
Water Absorption (@100% RH): 30% w/w
Specific Heat Capacity: 1800 Jkg-1K-1
Mould Resistance: CUAP 2002-01-25: Pass
Moth/Beetle Proofing: ISO 3998: Pass
Vapour Resistivity: 9 MN·s·g-1m-1
BS 5803-4, Flammability & Smoulder Resistance: Pass
EN11925-2, Reaction to Fire: Pass
Fire Classification: EuroClass E
Recoverability and thickness, EN 823: Pass
Dimensional stability to EN 1604: Pass
Can be used to achieve airborne sound reduction of Rw = 40dB
GWP (A1-A3) inc. biogenic carbon: 0.06 kgCO2e for R1
Recycled Content: 20%
Recyclable: Yes

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