140mm ThermaFleece CosyWool Roll 570mm

Thermafleece CosyWool Sheep’s Wool Loft Insulation - 140mm x 570mm

Offering excellent all-round performance and outstanding value for money, 140mm Thermafleece CosyWool Sheep Wool Loft Insulation is made from a high-performance blend of 75% natural sheep’s wool and recycled fibres. Independent research shows this blend delivers superior insulation performance compared to products with higher wool content alone.

Designed for loft insulation and internal applications, 140mm CosyWool is safe to handle, easy to install, and built to last. The natural wool fibres help absorb harmful airborne pollutants, contributing to a healthier indoor environment, while its moisture-regulating properties support long-term building performance.

This durable and sustainable insulation is supplied in a compressed format to reduce transport impact by up to 50%, expanding back to full thickness once unpacked and installed.

Looking for the 370mm split version ? Visit Cosywool 370mm Split

Pack Size & Coverage

1. Thickness (mm): 25, 50, 75, 100, 140, 150
2. Model: 140mm Thermafleece CosyWool Roll
3. Board size: 140mm x 570mm
4. Width: 570mm
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: 5.24 m² per pack
9. Thermal Conductivity 0.039 Wm-1K-1
10. Thermal Resistance: 3.59 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

Thermafleece CosyWool is an ideal choice for homeowners and builders looking for natural, breathable, energy-efficient insulation that delivers comfort, performance, and sustainability for UK buildings.

Installation & Handling – Thermafleece CosyWool Rolls

Thermafleece CosyWool insulation rolls are non-hazardous and comfortable to work with, making installation quick and straightforward. The material does not irritate the skin, eyes, or respiratory system, so it can be handled without gloves or specialist protective clothing. When fitting insulation in enclosed or poorly ventilated areas such as lofts, the use of suitable PPE, including a dust mask, is recommended.

To maintain the natural breathability of the insulation, 140mm Thermafleece CosyWool can be installed alongside a vapour-permeable underlay, supporting moisture control and healthy building performance.

For best results, store insulation under cover and off the ground. Once unpacked, protect it from prolonged exposure to sunlight, rain, or moisture to preserve its thermal and acoustic performance.

Info

Have a browse of our ThermaFleece Insulation products. We supply to the entire UK Mainland. If you’d like to talk through the suitability of some products for your project, or get a quantity discount quotation please call us by phone on 02039519012 / 02038839057, email sales@insulationstoreonline.co.uk or Live Chat - Lowest UK Insulation Prices near me.