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Thermafleece Ultrawool

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Ultrawool: High Density Sheep’s Wool insulation our highest level of acoustic performance

Thermafleece UltraWool is a high density, highly efficient insulation made from 75% British sheep’s wool and 25% recycled polyester. UltraWool is the ideal choice if you are looking for maximum thermal performance when space is at a premium. What’s more, with a density of 31 kg/m3 Thermafleece UltraWool helps provide exceptional acoustic insulation performance in wall, floor and roof systems.

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, breathability, durability and sustainability.

• Thermal Conductivity: 0.035 Wm-1K-1
• Water Absorption (@100% RH): 24% 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= 41dB
• GWP (A1-A3) inc. biogenic carbon: 0.11kgCO2e for R1
• Recycled Content: 20%
• Recyclable: Yes

Technical Data Sheets





ProductThicknessWidthLengthItems per packCoverage per pack
UltraWool50 mm390 mm1.2 m3014.04 m²
UltraWool50 mm590 mm1.2 m2014.16 m²
UltraWool70 mm390 mm1.2 m219.83 m²
UltraWool70 mm590 mm1.2 m149.91 m²
UltraWool90 mm390 mm1.2 m188.42 m²
UltraWool90 mm590 mm1.2 m128.50 m²
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