ThermaFleece UltraWool 90mm Flexible Slab

ThermaFleece UltraWool at 90mm thickness delivers outstanding thermal efficiency in a compact form, engineered for superior performance where space constraints matter.

This wool-rich, thermally bonded fibre blend outperforms higher wool-content alternatives, combining the advantages of sheep's wool insulation with enhanced breathability, resilience, and environmental responsibility.

Sheep's wool naturally sequesters atmospheric carbon during growth. When installed as insulation, it actively absorbs airborne pollutants, fostering a cleaner, healthier indoor atmosphere. Upgrading your property with 90mm UltraWool substantially reduces thermal losses through walls, roofs, and floors, lowering energy demand and carbon footprint.

The densest option within the 90mm ThermaFleece range, UltraWool delivers a tight friction fit in wall cavities and roof spaces, amplifying both thermal and acoustic properties.

Fully vapour-permeable and breathable, this product manages moisture effectively during humid conditions, preserving a balanced and healthy building environment.

Seeking the 390mm split variant? Check out UltraWool 390mm Split

Pack Size & Coverage

1. Thickness (mm): 50, 70, 90
2. Model: 90mm Thermafleece CosyWool Slab
3. Board size: 90mm x 590mm
4. Width: 590mm
5. Length: 1200mm
6. Items per pack: 12
7. Total coverage: 8.50m² 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 supporting a healthy, comfortable indoor environment.

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 UltraWool throughout your building significantly minimises thermal losses from walls, roofs, and floors, driving down energy consumption and reducing your carbon footprint.

High Performance

At 0.035 W/mK thermal conductivity, ThermaFleece UltraWool ranks among the highest-performing natural fibre insulation solutions available across the UK market.

Cost-Effective

The energy savings delivered by UltraWool enable the product to recoup its investment within several years, offering excellent value for both homeowners and construction professionals.

Long-Lasting

Incorporating a lofting agent, UltraWool maintains fibre stability and structural integrity throughout the building's lifespan, guaranteeing consistent thermal performance.

Sustainable

Manufactured from renewable sheep wool, UltraWool cuts CO₂ emissions by several tonnes over its service life. The wool fibres naturally capture carbon dioxide, lowering overall greenhouse gas impact and advancing responsible building practices.

Info

Browse our complete ThermaFleece insulation range. We deliver across the UK Mainland. To discuss product suitability for your project or request a bulk discount quotation, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat for competitive UK insulation pricing.