ThermaFleece UltraWool 50mm Flexible Slab

50mm Thermafleece UltraWool is a premium-grade, high-performance insulation solution engineered for superior thermal efficiency in confined spaces.

Manufactured from a thermally bonded wool-rich fibre composition, the 50mm Thermafleece UltraWool slab delivers exceptional durability whilst resisting fibre settlement. Research demonstrates this fibre blend outperforms higher wool-content alternatives, combining the advantages of natural sheep's wool with improved breathability, structural resilience, and environmental credentials.

Sheep's wool is a naturally renewable material that sequesters atmospheric carbon during growth. When incorporated into insulation, it actively captures airborne contaminants, fostering improved indoor air quality. Specifying Thermafleece UltraWool enhances building energy performance and substantially reduces operational heating expenses.

As the highest-density option within the 50mm Thermafleece portfolio, UltraWool achieves a mechanical grip in cavity and pitched applications, amplifying both thermal and sound-dampening properties for extended building comfort.

The 50mm UltraWool formulation is fully vapour-permeable and moisture-responsive, buffering humidity fluctuations and maintaining a balanced, healthy building fabric.

Looking for the 590mm split version? Visit Ultrawool 590mm Split

Pack Size & Coverage

1. Thickness (mm): 50, 70, 90
2. Model: 50mm Thermafleece UltraWool Slab
3. Board size: 50mm x 390mm
4. Width: 390mm
5. Length: 1200mm
6. Items per pack: 30
7. Total coverage: 14.04m² per pack
8. Thermal Conductivity 0.035 Wm-1K-1
9. Thermal Resistance: 1.43 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, managing moisture buffering during high-humidity conditions 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 50mm Thermafleece UltraWool throughout your building envelope minimises thermal bridging from walls, roofs, and floors, delivering measurable reductions in energy demand and carbon output.

High Performance

Delivering a thermal conductivity rating of 0.035 W/mK, Thermafleece 50mm UltraWool ranks among the highest-performing natural fibre insulation products currently available across the UK market.

Cost-Effective

The operational energy savings realised through UltraWool specification enable rapid payback periods, typically within several years, representing excellent value for both residential and commercial projects.

Long-Lasting

Thermafleece UltraWool incorporates a lofting stabiliser to preserve fibre alignment, structural integrity, and performance consistency, guaranteeing dependable thermal resistance throughout the building's service life.

Sustainable

Sourced from renewable sheep wool, UltraWool substantially reduces lifecycle carbon emissions. The wool fibres naturally sequester carbon dioxide, contributing to lower greenhouse gas profiles and advancing sustainable building practices.

Info

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