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Sheeps Wool Loft Insulation CosyWool by Thermafleece 50mm x 370mm - 14.43m2

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£81.32 Incl. VAT
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Thermafleece CosyWool is a versatile insulation rich in sheep’s wool and is the ideal choice if you are looking for all round performance and value for money. Research shows that using 75% wool in combination with recycled fibres outperforms alternative products with a higher percentage of wool. Our wool rich blend ensures you get the full benefit of sheep’s wool with enhanced performance, durability and sustainability.

Thermafleece CosyWool’s convenient compressed form reduces transport impacts by more than 50% compared to other natural insulation and makes it ideal for quick and easy installation. Once unpacked, it regains its original thickness to provide excellent thermal and acoustic performance.

Deliveries to the postcodes AB, IV, KW, PH, PA, HS, KA, ZE and to ROI/NI may incur additional delivery charges.

14.43m2 coverage per pack.
3 item pack.


Length: 13m.
Width: 370mm.
Thickness: 50mm.
Thermal Conductivity: 0.039  W/mK.
Water Absorption (@100% RH): 30% w/w.
Specific Heat Capacity: 1800 Jkg-1K-1.
Ignition Point: >500°C.
Density: 18 kgm-3.
Can be used to achieve airborne sound reduction of Rw = 40dB.


  • Roofs: loft & warm roof.
  • Walls: timber frame & solid (internal)
  • Floors: all levels above DPC.
  • Acoustic: walls, floors & roofs.


Length 13000mm Thickness 50mm Width 370mm


Thermal Conductivity 0.039 W/mK Application Floors
Stud Walls
Material Sheeps Wool Range Thermafleece


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Questions & Answers


What is the R value of sheep wool at 50mm depth?


The approximate rValue of this product is 1.28 W/mK based upon 50mm divided by the thermal conductivity. 


Is this product treated to stop pest infestation? Thank you.


Hi Susanna,

This insulation has been treated to prevent moths and beetles (ISO 3998) but has the same rodent resistance as most other insulation.

We hope this helps.


How much does the therma fleece weigh per 17.28m2 pack?


They are about 12.5 kilos a pack.

Have a question about this product?


4 / 5 3 reviews
14th March
Used this before so no qualms about using it again.
Gareth Glynn
6th March
Great product, fair price
Chris Gray
16th October 2020
Seems to work well, but, does not quite match depth measurement and some poor manufacture - thickness, length, width all inconsistent. Also you still req protection as working with this is itchy! Been by based in Cumbria I really wanted to be able to recommend this but, reservations.
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Sheeps Wool Loft Insulation CosyWool by Thermafleece 50mm x 370mm - 14.43m2

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