ThermaFleece | SKU: TF-CWS

Thermafleece CosyWool Slab - Sheep's Wool Insulation

Name: Thermafleece CosyWool Slab - Sheep's Wool Insulation
Brand: ThermaFleece
SKU: TF-CWS
Price: 57.07 GBP
Availability: InStock

£57.07 GBP

Key Facts
-Width (mm) – 370, 570
-Thickness (mm) – 50, 75, 100, 140
, 140 Thermal conductivity – 0.038 W/mK
-Sound absorption – NRC 1.05 @ 100mm
-Sound reduction – Rw 40dB @ 75mm
-Highly breathable
-Made in the UK
-Contains British wool
-Manufactured to ISO 9001
-Can be recycled

Applications
-Roofs – Loft & warm roof
-Walls – Timber frame & solid (internal)
-Floors – All levels above DPC
-Acoustic – Walls, floors & roofs

Size

370 x 50 370 x 75 370 x 100 370 x 140 570 x 50 570 x 75 570 x 100 570 x 140

Product variants

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Description

Thermafleece CosyWool Slab is a high performance, eco conscious, insulation made from a blend of 75% British sheeps wool and 25% recycled fibres. Designed as a flexible yet firm friction fit slab, it slots neatly into walls, roofs, and floor cavities to provide excellent thermal and acoustic insulation with long lasting reliability.

Unlike many alternatives, independent research confirms that CosyWool's unique wool rich blend outperforms products with higher wool percentages - delivering enhanced efficiency, durability, and sustainability. Its natural breathability also helps regulate moisture, creating a healthier indoor environment while protecting your building fabric.

Why Choose Thermafleece CosyWool Slab?

Outstanding thermal and acoustic performance
Energy efficient and cost effective
Sustainable and low carbon
Healthy and breathable
Safe to handle
Durable and reliable
Certified quality

Technical Specifications

Thermal conductivity: 0.038 W/m·K
Water absorption (@100% RH): Up to 30% w/w
Specific heat capacity: 1800 J/kg·K
Acoustic: Rw = 40 dB (when correctly installed)
Mould resistance: Pass (CUAP 2002-01-25)
Moth and beetle resistance: Pass (ISO 3998)
Fire performance: EuroClass E | BS 5803-4 (Pass) | EN 11925-2 (Pass)
Dimensional stability: Pass (EN 1604)
Thickness recovery: Pass (EN 823)

Sizes Available:

Thickness: 50mm, 75mm, 100mm, 140mm

Widths: 370mm and 570mm

Length: 1200mm

Installation and Handling

Designed for simple, friction fit installation with no specialist tools.
Safe to handle without gloves or protective clothing (PPE recommended in dusty or confined spaces).
Store dry and out of direct sunlight; replace any insulation exposed to prolonged wetting.
Not suitable for use as a cavity barrier.

Whether you’re retrofitting a period property or insulating a new eco-build, Thermafleece CosyWool Slab is the smart, sustainable choice. It keeps your home warmer, quieter, and healthier—while reducing your carbon footprint.