ThermaFleece UltraWool 70mm Flexible Slab

ThermaFleece UltraWool at 70mm thickness delivers outstanding thermal performance in confined spaces through its high-density construction and thermally bonded wool-rich fibre blend.

This premium natural insulation combines sheep's wool with complementary fibres that are thermally bonded together, creating a product that resists slumping and maintains long-term performance. Testing demonstrates this formulation outperforms higher wool-content alternatives, delivering superior breathability, resilience, and environmental credentials.

Sheep's wool naturally sequesters atmospheric carbon dioxide during growth. When installed as insulation, the material actively absorbs airborne pollutants, contributing to healthier indoor air quality. Upgrading to ThermaFleece UltraWool substantially improves energy efficiency and reduces heating expenditure.

As the most densely constructed option within the 70mm ThermaFleece portfolio, UltraWool achieves a secure friction fit in wall cavities and roof spaces, simultaneously enhancing thermal and acoustic properties.

The product is fully vapour-permeable and breathable, enabling moisture buffering during high-humidity periods and supporting a balanced, healthy building environment.

Looking for the 390mm split version? Visit UltraWool 390mm Split

Pack Size & Coverage

1. Thickness (mm): 50, 70, 90
2. Model: 70mm ThermaFleece UltraWool Slab
3. Board size: 70mm x 590mm
4. Width: 590mm
5. Length: 1200mm
6. Items per pack: 14
7. Total coverage: 9.91m² per pack
8. Thermal Conductivity 0.035 Wm-1K-1
9. Thermal Resistance: 2.0 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, enabling moisture buffering 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 70mm ThermaFleece UltraWool substantially reduces thermal loss through walls, roofs, and floors, lowering overall energy consumption and minimising carbon emissions.

High Performance

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

Cost-Effective

Energy savings from UltraWool installation typically offset the product cost within several years, making it a sound financial investment for property owners and construction professionals.

Long-Lasting

A lofting agent within the formulation preserves fibre stability and structural integrity, guaranteeing sustained performance throughout your building's lifespan.

Sustainable

Manufactured from renewable sheep wool, UltraWool reduces lifetime CO₂ emissions by several tonnes. The wool naturally captures carbon dioxide, lowering greenhouse gas impact and supporting responsible building practices.

Info

Explore our complete ThermaFleece insulation range. We deliver throughout the UK mainland. For product suitability advice on your project or bulk quotations, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk, or use our Live Chat service.