Thermafleece CosyWool
Product Overview
Main purpose
Lightweight, natural and sustainable thermal and acoustic insulation.
Use it on
Between studs in timber frame walls and between rafters in roofs. Also perfect as loft insulation, between and over joists, between joists in a suspended timber floor and in ceilings.
Overview
CosyWool is a natural insulation manufactured in the UK from British sheep's wool. It is breathable, offers excellent insulation properties and helps maintain a stable humidity and moisture levels within a building. CosyWool can be safely handled with no precautions or safety equipment needed, making it a straight-forward D.I.Y product, especially for loft insulation.
Features
- Natural thermal insulation
- Roll format
- Made from sheep’s wool
- Very easy to install
- Safe to handle
- Breathable
- Effective acoustic insulation
Benefits
- Insulates the home effectively, reducing energy consumption and heating bills, also acts as an effective acoustic insulation.
- A simple DIY installation - rolls fit through attic access, then are easy to roll out.
- A natural, renewable resource.
- No harmful additives; 100% safe and causes no irritation to the skin, eyes, or respiratory tract.
- Natural fibre insulation can help stabilise humidity and moisture levels within buildings. This improves indoor air quality (IAQ) and reduces the risk of condensation and mould.
- Long lasting and will retain form and shape over the long term.
- Quality Assured Thermafleece CosyWool is manufactured and supplied in accordance with ISO 9001 quality and ISO 14001 environmental management systems.
- Tested and approved high resistance to moths to ISO 3998.
Questions
There are currently no questions and answers published for this product
Technical Details
Key Technical Data
Installation Guide
How to Install
Gloves and protective clothing are not required. We would however recommend a dust mask when working in a loft.
CosyWool is typically installed with a breathable (vapour open) airtight membrane to maintain the benefits of water vapour absorption and release and to eliminate draughts that always lower the effectiveness of the insulation.
The wool insulation should be protected from prolonged exposure to sunlight once it is unpacked and try to avoid it being wet for extended periods. Store it under cover and it must not be in contact with the ground.
Measure the size of the space in which the insulation will be inserted, for example between rafters, studs, joists or timbers and make a note of the total length required. The insulation should be slightly wider and longer than the space being filled so it can be gently squeezed into place and remain there due to friction with the timber to the sides.
For cutting accurately, tightly compress or clamp the insulation between two pieces of straight timber (at least 15mm thick). Keep the two timber edges aligned, then cut along the edge with a scalloped insulation knife keeping the blade firmly and squarely against both timber edges at all times.

Tips & Hints
CosyWool can be installed in multiple layers to achieve the desired thickness. The lengths of insulation should be staggered so there are no joins directly above each other in each layer.