Thermafleece UltraWool slab sheeps wool insulation Thermafleece UltraWool Insulation

Thermafleece UltraWool

British sheeps wool insulation for general applications within the building envelope.

Suitable for use in a number of applications including roof, wall and floor systems.

Made in Britain from 75% British sheeps wool and 25% recycled polyester.

UltraWool is high density with better thermal values offer more efficient thermal and acoustic characteristics.

Higher thermal mass helps buffer heat to reduce summertime overheating.

Allows a healthy moisture balance helping protect building fabric and health.

Can be safely handled without gloves or protective clothing

Thicknesses and Availability:

This UltraWool range includes the following readily available product thicknesses: 50mm, 70mm and 90mm.

Product Information

General information about Thermafleece UltraWool

Product Application

General application insulating slab

Thermafleece's natural sheeps wool slabs, UltraWool, is suitable for use in roofs, walls and floors throughout the building.

Product Make-up


Thermafleece UltraWool slab is manufactured by combining British sheeps wool (75%) and recyceled polyester and binders (25%) before being compressed and cut into dense slabs.

Product Properties

Thickness 50mm to 90mm
Slab Length 1.2m
Slab Width 0.39m and 0.59m

Product Prices

Buy Thermafleece NatraHemp

These items are shipped direct to site from the manufacturer; carriage charges will apply. The carriage charge is based on the number of packs ordered. Please select the appropriate UltraWool product(s) and relevant delivery charge before adding to the basket. If an order is placed without, or with an incorrect delivery charge, I will contact you before processing the order.

Product ex-VAT inc-VAT
Thermafleece UltraWool Slab 50mm, 30 x 0.39x1.2m = 14.04m² £144.29 £173.14
Thermafleece UltraWool Slab 50mm, 20 x 0.59x1.2m = 14.16m² £145.52 £174.62
Thermafleece UltraWool Slab 70mm, 21 x 0.39x1.2m = 9.83m² £141.54 £169.84
Thermafleece UltraWool Slab 70mm, 14 x 0.59x1.2m = 9.91m² £142.69 £171.22
Thermafleece UltraWool Slab 90mm, 18 x 0.39x1.2m = 8.42m² £155.66 £186.79
Thermafleece UltraWool Slab 90mm, 12 x 0.59x1.2m = 8.5m² £157.14 £188.56
Please add one of the below delivery charge options, based on the number of packs of Thermafleece CosyWool being ordered:
Delivery Charge ex-VAT inc-VAT
1 x pack of Thermafleece UltraWool £30.00 £36.00
2 x packs of Thermafleece UltraWool £60.00 £72.00
3 - 4 packs of Thermafleece UltraWool £70.00 £84.00
5 - 8 packs of Thermafleece UltraWool £140.00 £168.00
9 - 12 x packs of Thermafleece UltraWool £210.00 £252.00
13 - 16 packs of Thermafleece UltraWool £280.00 £336.00
17 - 20 x packs of Thermafleece UltraWool £350.00 £420.00
21+ packs of Thermafleece UltraWool £420.00 £504.00

Reasonable stock levels are held with delivery lead times being around 4-5 working days. Larger orders may take a little longer.

Thermafleece reserves the right to change stocked products - while we will do all we can to keep on top of changes, availability and lead times my vary.

  • Generally 1 or 3 working days for delivery
  • Generally 1 to 5 working days for delivery
  • Generally 5 to 10 working days for delivery
  • Special request or made to order item, allow extended lead times. Minimum order levels may apply.
  • Please call to check availability and approximate lead times

Product Performance and Guides

Product Performance, Manufacturer Downloads, and Installation Guides

Product Performance

Thermal Conductivity 0.035 W/m·K
Nominal Density approx. 31 kg/m³
Water Absorption 30% w/w @100% RH
Mould Resistance Pass CUAP 2002-01-25
Moth/Beetle Proofing Pass ISO 3998
Vapour Resistance > 9 MNs/gm
Product Thickness Thermal Resistance kg/m²
UltraWool 50mm 50mm 1.43 m²K/W 1.54 kg/m²
UltraWool 70mm 70mm 2.00 m²K/W 2.14 kg/m²
UltraWool 90mm 90mm 2.57 m²K/W 2.79 kg/m²

Standards & Approval

Thermafleece UltraWool is manufactured in accordance with quality management system ISO 9001. All products must be installed in accordance with guidance issued by Thermafleece.

Where building regulation approval is required, you should take advice from your local building control authority and the building designer.

  • GWP (A1-A3): 1.63 kgCO2e
  • GWP (A1-A3) inc. biogenic carbon: 0.59 kgCO2e
  • Recycled Content: 20%
  • Recyclable: Yes

Thermafleece Videos

How to cut Thermafleece insulation