25mm CosyWool Sheep Wool Loft Insulation Roll 370mm

Thermafleece CosyWool Sheep's Wool Loft Insulation - 25mm x 370mm

Combining natural performance with outstanding value, 25mm Thermafleece CosyWool Sheep Wool Loft Insulation comprises a premium blend of 75% natural sheep's wool and recycled fibres. Third-party testing demonstrates this formulation achieves superior thermal performance when compared to higher wool-content alternatives.

Engineered for loft insulation and interior use, 25mm CosyWool is straightforward to handle, simple to fit, and engineered for durability. The natural wool component actively traps airborne contaminants, fostering improved indoor air quality, whilst its moisture-management properties enhance structural longevity.

This robust, environmentally responsible insulation arrives in compressed form to minimise transport emissions by approximately 50%, then expands fully upon installation without any reduction in thermal effectiveness.

Looking for the 570mm split version? Visit Cosywool 570mm Split

Pack Size & Coverage

1. Thickness (mm): 25, 50, 75, 100, 140, 150
2. Model: 25mm Thermafleece CosyWool Roll
3. Board size: 25mm x 370mm
4. Width: 370mm
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: 4.44m² 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 insulation blended with recycled fibres
• Excellent thermal performance with thermal conductivity of 0.039 W/mK
• Moisture regulating - absorbs up to 30% w/w at 100% RH without losing performance
• High fire resistance with an ignition point above 500°C
• Safe and comfortable to install, non-irritant and breathable
• 18 kg/m³ density for reliable thermal and acoustic performance
• High specific heat capacity of 1800 Jkg⁻¹K⁻¹, helping to stabilise indoor temperatures
• Airborne sound reduction up to Rw 40dB, ideal for acoustic insulation
• Supplied compressed to reduce carbon impact during transport

Suitable Applications

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

25mm Thermafleece CosyWool represents an excellent option for property owners and construction professionals seeking natural, vapour-permeable, energy-efficient insulation that combines comfort, performance, and environmental responsibility across UK properties.

Installation & Handling – Thermafleece CosyWool Rolls

25mm Thermafleece CosyWool insulation rolls are safe to handle and user-friendly, enabling rapid and efficient installation. The material poses no skin, eye, or respiratory irritation, permitting installation without gloves or specialist safety equipment. When working in confined or inadequately ventilated spaces including lofts, appropriate PPE such as a respiratory mask is advisable.

To preserve the natural breathability characteristics of the insulation, Thermafleece CosyWool works effectively with a vapour-permeable membrane, optimising moisture management and supporting robust building performance.

Info

Explore our complete range of ThermaFleece Insulation options. We deliver across the UK Mainland. To discuss product suitability for your application, request a bulk discount quotation, call 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat - Best UK Insulation Prices near me.