Thermafleece CosyWool 100mm Loft Insulation Roll

Thermafleece CosyWool Sheep's Wool Loft Insulation - 100mm x 570mm

Combining natural performance with exceptional value, 100mm Thermafleece CosyWool Sheep Wool Loft Insulation comprises a carefully formulated blend of 75% natural sheep's wool and recycled fibres. Research demonstrates this composition achieves superior thermal efficiency compared to alternatives relying solely on higher wool percentages.

Engineered for loft insulation and internal use, 100mm CosyWool offers straightforward installation, comfortable handling, and proven durability. The natural wool component actively traps airborne contaminants, fostering improved indoor air quality, whilst its inherent moisture-management capabilities ensure sustained structural integrity and thermal performance.

This eco-conscious insulation arrives in a compressed state, minimising transport emissions by approximately 50%, then returns to its full working thickness upon installation.

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

Pack Size & Coverage

1. Thickness (mm): 25, 50, 75, 100, 140, 150
2. Model: 100mm Thermafleece CosyWool Roll
3. Board size: 100mm x 570mm
4. Width: 570mm
5. Length: Length: 6.5m
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: 7.41m² per pack
9. Thermal Conductivity 0.039 Wm-1K-1
10. Thermal Resistance: 2.56 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

• 100mm 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 represents an excellent solution for UK property owners and construction professionals seeking natural, vapour-permeable, energy-efficient insulation that combines comfort, performance, and environmental responsibility.

Installation & Handling – Thermafleece CosyWool Rolls

Thermafleece CosyWool insulation rolls present no hazardous properties and prove straightforward to handle, enabling rapid and efficient installation. The material causes no skin, eye, or respiratory irritation, permitting safe handling without gloves or specialised protective equipment. When installing insulation within confined or inadequately ventilated spaces such as lofts, wearing appropriate PPE including a dust mask remains advisable.

To preserve the natural vapour permeability of the insulation, 100mm Thermafleece CosyWool works effectively with a vapour-permeable underlay, promoting effective moisture management and optimal building health.

For optimal outcomes, keep insulation sheltered and elevated before installation. Following unpacking, shield it from extended direct sunlight, wet conditions, or dampness to maintain its thermal and acoustic properties.

Info

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