ThermaFleece UltraWool 70mm Flexible Slab

ThermaFleece UltraWool at 70mm thickness delivers superior thermal performance in confined spaces, engineered from thermally bonded wool-rich fibres that resist settling and maintain long-term effectiveness.

This high-density wool insulation combines the natural benefits of sheep's wool with enhanced breathability and resilience. Research demonstrates that this fibre composition outperforms higher wool-content alternatives, providing genuine sheep's wool advantages alongside improved durability and environmental credentials.

Sheep's wool naturally absorbs atmospheric carbon dioxide during growth. When installed as insulation, it captures airborne contaminants, fostering healthier interior air quality. Upgrading to ThermaFleece UltraWool strengthens thermal efficiency and substantially lowers heating expenditure.

As the densest option within the 70mm ThermaFleece collection, UltraWool creates a firm friction fit within wall and roof cavities, amplifying thermal performance and acoustic dampening for sustained comfort.

The product remains fully vapour-permeable and breathable, enabling moisture regulation during high-humidity conditions and supporting a stable, healthy building environment.

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

Pack Size & Coverage

1. Thickness (mm): 50, 70, 90
2. Model: 70mm ThermaFleece UltraWool Slab
3. Board size: 70mm x 390mm
4. Width: 390mm
5. Length: 1200mm
6. Items per pack: 21
7. Total coverage: 9.83m² per pack
8. Thermal Conductivity 0.035 Wm-1K-1
9. Thermal Resistance: 2.01 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, regulating moisture during periods of elevated humidity whilst maintaining 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 70mm ThermaFleece UltraWool substantially diminishes thermal loss through walls, roofs, and floors, driving down energy consumption and carbon output.

High Performance

Delivering thermal conductivity of 0.035 W/mK, ThermaFleece UltraWool ranks amongst the highest-performing natural fibre insulation solutions across the UK market.

Cost-Effective

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

Long-Lasting

ThermaFleece UltraWool incorporates a lofting agent preserving fibre structure, dimensional integrity, and extended durability, guaranteeing consistent performance throughout your building's lifespan.

Sustainable

Manufactured from renewable sheep wool, UltraWool cuts CO₂ emissions by several tonnes across its operational life. The wool naturally sequesters carbon dioxide, reducing atmospheric greenhouse gases and advancing sustainable building practices.

Info

Browse our complete ThermaFleece Insulation range. We deliver throughout UK Mainland. For guidance on product suitability, project specifications, or bulk pricing enquiries, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat.