ThermaFleece CosyWool 140mm Sheep Wool Roll

ThermaFleece CosyWool Sheep's Wool Loft Insulation - 140mm x 370mm

Combining natural performance with genuine value, 140mm ThermaFleece CosyWool Sheep Wool Loft Insulation comprises a premium blend of 75% natural sheep's wool and recycled fibres. Independent testing confirms this formulation outperforms alternatives with higher wool percentages alone.

Built for loft insulation and internal spaces, 140mm CosyWool handles easily, installs simply, and performs reliably over time. The natural wool component actively filters airborne contaminants, fostering improved indoor air quality, whilst its hygroscopic characteristics maintain stable building conditions.

This robust, eco-conscious insulation arrives compressed to minimise transport emissions by up to 50%, expanding fully upon installation without performance loss.

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

Pack Size & Coverage

1. Thickness (mm): 25, 50, 75, 100, 140, 150
2. Model: 140mm ThermaFleece CosyWool Roll
3. Board size: 140mm x 370mm
4. Width: 370mm
5. Length: Length: 4.6m
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: 5.11m² per pack
9. Thermal Conductivity 0.039 Wm-1K-1
10. Thermal Resistance: 3.5 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

• 140mm 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

140mm ThermaFleece CosyWool represents a smart option for property owners and contractors seeking natural, vapour-permeable, energy-efficient insulation that combines comfort, durability, and environmental responsibility across UK properties.

Installation & Handling – ThermaFleece CosyWool Rolls

140mm ThermaFleece CosyWool insulation rolls are non-hazardous and user-friendly, enabling swift, hassle-free installation. The product does not cause skin, eye, or respiratory irritation, allowing straightforward handling without gloves or specialist protective equipment. When working in enclosed or poorly ventilated spaces such as lofts, wearing appropriate PPE including a dust mask is advisable.

To preserve the natural breathability of the product, ThermaFleece CosyWool pairs well with a vapour-permeable underlay, optimising moisture management and supporting long-term building health.

Info

Browse our full ThermaFleece Insulation range. We deliver across the UK Mainland. For product suitability advice, bulk pricing, or project guidance, contact us on 02039519012 / 02038839057, email sales@insulationbee.co.uk or use Live Chat - Competitive UK Insulation Pricing.