Thermafleece UltraWool 90mm Flexible Slab

90mm Thermafleece UltraWool delivers exceptional thermal performance in a high-density format, engineered for applications where space constraints demand maximum efficiency.

Constructed from thermally bonded wool-rich fibres, this 90mm slab combines outstanding durability with resistance to settling. Performance testing demonstrates that this fibre blend surpasses higher wool-content alternatives, providing the full advantages of sheep's wool insulation alongside superior breathability, resilience, and environmental credentials.

Sheep's wool naturally sequesters atmospheric carbon dioxide throughout its growth cycle. When incorporated into insulation, it actively traps airborne contaminants, fostering improved indoor air quality. Specifying Thermafleece UltraWool enhances building energy efficiency whilst simultaneously reducing operational heating expenditure.

As the highest-density offering within the 90mm Thermafleece portfolio, UltraWool achieves a secure friction fit across wall and roof cavities, amplifying both thermal resistance and sound attenuation for sustained occupant comfort.

The product is fully vapour-permeable and moisture-responsive, buffering humidity fluctuations and preserving a balanced, healthy building environment.

Seeking the 590mm split variant? Explore Ultrawool 590mm Split

Pack Size & Coverage

1. Thickness (mm): 50, 70, 90
2. Model: 90mm Thermafleece UltraWool Slab
3. Board size: 90mm x 390mm
4. Width: 390mm
5. Length: 1200mm
6. Items per pack: 18
7. Total coverage: 8.42m² per pack
8. Thermal Conductivity 0.035 Wm-1K-1
9. Thermal Resistance: 2.57 W/m K
10. Density: 31 kg/m3
11. Vapour Resistivity: 9 MN·s·g-1m-1
12. Highly Breathable Yes
13. Vapour open:Yes
14. Sound Reduction - Rw = 41dB
15. Made from British wool Yes
16. Made in the UK Yes
17. Contains recycled materials 20%
18. Recyclable Yes
19. Manufactured to ISO 9001 and 14001: Yes
20. Carbon Footprint PAS 20250 (60 year life): 0.50kg CO2e for R1
21. Dimensional Stability to EN 1604: Pass
22. Flammability & Smoulder Resistance (BS 5803-4): Pass

All Thermafleece British sheep wool insulation products are vapour-permeable and fully breathable, buffering moisture during high-humidity periods and sustaining a healthy, comfortable indoor atmosphere.

Suitable Applications

1. Floors – Suspended ground floor & between floors
2. Lofts – Cold roofs
3. Warm Roofs – Pitched roof or attic conversions
4. Walls – Timber frame & solid (internal)

Why Choose Thermafleece UltraWool Insulation?

Installing 90mm Thermafleece UltraWool throughout your building envelope substantially minimises thermal loss via walls, roofs, and floors, driving down energy demand and carbon output.

High Performance

Delivering thermal conductivity of 0.035 W/mK, Thermafleece UltraWool ranks among the UK's most efficient natural fibre insulation solutions.

Cost-Effective

The thermal savings generated by UltraWool installation enable the product to offset its capital cost within several years, representing sound financial sense for property owners and construction professionals.

Long-Lasting

Thermafleece UltraWool incorporates a lofting agent preserving fibre alignment, structural integrity, and extended service life, guaranteeing consistent performance throughout your building's operational lifetime.

Sustainable

Manufactured from renewable sheep wool, UltraWool mitigates CO₂ emissions across its lifecycle. The wool fibres inherently capture atmospheric carbon, reducing greenhouse gas concentrations and advancing sustainable building practices.

Info

Browse our complete ThermaFleece Insulation range. We deliver across the UK Mainland. For project-specific guidance, product suitability assessment, or bulk pricing enquiries, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat - Lowest UK Insulation Prices near me.