90mm ThermaFleece UltraWool Flexible Slab 590mm

90mm Thermafleece UltraWool is a high-density, highly efficient insulation product designed to deliver maximum thermal performance even when space is limited.

Made from a wool-rich blend of fibres that are thermally bonded, 90mm UltraWool ensures long-lasting durability and prevents slumping over time. Research shows this blend outperforms products with a higher wool content, giving you the full benefits of sheep’s wool insulation with improved breathability, resilience, and sustainability.

90mm Sheep’s wool is an exceptional natural fibre. As it grows, it naturally removes carbon dioxide from the atmosphere. When used as insulation, wool absorbs airborne chemicals that may be harmful, creating a healthier indoor environment. Installing Thermafleece UltraWool is also a highly effective way to improve energy efficiency and reduce heating costs.

As the densest product in the 90mm Thermafleece range, UltraWool provides a secure friction fit in walls and roofs, enhancing both thermal and acoustic performance.

90mm UltraWool is fully vapour-open and breathable, allowing moisture to be buffered during periods of high humidity, helping to maintain a comfortable and healthy building envelope.

Looking for the 390mm split version ? Visit 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-open and fully breathable, allowing moisture to be buffered during periods of high humidity and helping to maintain 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?

Insulating your property with 90mm Thermafleece UltraWool can significantly reduce energy loss from walls, roofs, and floors, helping to lower energy consumption and cut carbon emissions.

High Performance

With a thermal conductivity of just 0.035 W/mK, Thermafleece 50mm UltraWool is one of the best-performing natural fibre insulation products available in the UK.

Cost-Effective

The energy savings achieved by using UltraWool mean the insulation can pay for itself in just a few years, making it an economical choice for homeowners and builders.

Long-Lasting

Thermafleece UltraWool contains a lofting agent to maintain fibre stability, structural integrity, and long-term durability, ensuring reliable performance over the life of your building.

Sustainable

Made from renewable sheep wool, UltraWool can reduce CO₂ emissions by several tonnes over its lifetime. The wool fibres naturally fix carbon dioxide, helping to lower greenhouse gas levels and support environmentally responsible construction.

Info

Have a browse of our ThermaFleece Insulation products. We supply to the entire UK Mainland. If you’d like to talk through the suitability of some products for your project, or get a quantity discount quotation please call us by phone on 02039519012 / 02038839057, email sales@insulationstoreonline.co.uk or Live Chat - Lowest UK Insulation Prices near me.