ThermaFleece CosyWool 25mm Sheep Wool Roll 570mm

ThermaFleece CosyWool Sheep's Wool Loft Insulation - 25mm x 570mm

This 25mm ThermaFleece CosyWool sheep wool loft insulation combines 75% natural sheep's wool with recycled fibres for superior thermal performance. Independent testing confirms this blend outperforms higher wool-content alternatives, delivering excellent value alongside outstanding results.

Engineered for loft insulation and internal spaces, this 25mm product is straightforward to fit, safe to handle, and built for durability. Natural wool fibres actively trap airborne pollutants to improve indoor air quality, whilst moisture-regulating properties maintain building health long-term.

This sustainable insulation arrives compressed, cutting transport carbon by up to 50%. It expands to full thickness immediately after unpacking and installation.

Looking for the 370mm split version? Check out CosyWool 370mm Split

Pack Size & Coverage

1. Thickness (mm): 25, 50, 75, 100, 140, 150
2. Model: 25mm ThermaFleece CosyWool Roll
3. Board size: 25mm x 570mm
4. Width: 570mm
5. Length: Length: 12m
6. Roll Lengths: 12.0m (25mm) 13.0m (50mm), 8.5m (75mm), 6.5m (100mm), 4.6m (140mm), 4.3m (150mm)
7. Items per pack: 1
8. Total coverage: 6.84m² per pack
9. Thermal Conductivity 0.039 Wm-1K-1
10. Thermal Resistance: 0.063 W/m K
11. Density: 18 kg/m3
12. Vapour Resistivity: 9 MN·s·g-1m-1
13. Highly Breathable Yes
14. Vapour open:Yes
15. Sound Absorption:NRC 1.05 @100 mm
16. Made from British wool Yes
17. Made in the UK Yes
18. Contains recycled materials 20%
19. Recyclable Yes
20. Manufactured to ISO 9001 and 14001: Yes

Key Features & Benefits

• 25mm natural sheep wool blended with recycled fibres for enhanced performance
• Thermal conductivity of 0.039 W/mK delivers reliable insulation efficiency
• Moisture-regulating capability absorbs up to 30% w/w at 100% RH without performance loss
• Fire-resistant with ignition point exceeding 500°C for safety
• Non-irritant, breathable, and comfortable to install without specialist equipment
• 18 kg/m³ density provides consistent thermal and acoustic performance
• High specific heat capacity of 1800 Jkg⁻¹K⁻¹ stabilises indoor temperatures
• Acoustic performance up to Rw 40dB, perfect for acoustic insulation applications
• Compressed format reduces transport environmental impact

Suitable Applications

• Loft insulation
• Floors above DPC
• Timber frame and solid walls (internal)
• Warm roofs
• Acoustic insulation projects

ThermaFleece CosyWool suits builders and homeowners seeking natural, breathable, energy-efficient insulation that combines comfort, performance, and environmental responsibility for UK properties.

Installation & Handling – ThermaFleece CosyWool Rolls

ThermaFleece CosyWool insulation rolls are non-hazardous and user-friendly, enabling quick, simple installation. The material causes no skin, eye, or respiratory irritation, so handling requires no gloves or specialist protective gear. When working in enclosed or poorly ventilated spaces like lofts, a dust mask and appropriate PPE remain advisable.

Pair this product with a vapour-permeable underlay to preserve natural breathability, supporting moisture management and healthy building performance.

For optimal results, keep insulation covered and elevated before use. Once unpacked, shield it from direct sunlight, rain, and moisture to protect thermal and acoustic properties.

Info

Explore our full range of ThermaFleece insulation products. We deliver across UK Mainland. For project suitability advice or bulk quotations, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat for competitive UK insulation pricing.