Price range: £81.70 through £132.18
• Ideal for Walls & Warm Roofs: Sturdy and dense insulation, ideal for non-horizontal applications. The denser structure provides excellent acoustics at lower thicknesses.
• Safe & Sustainable: Made from locally sourced British wool, it acts as a carbon sink to lock away carbon for decades. Safe and non-hazardous to handle without the “itchy” discomfort.
• Long-Lasting Performance: Our wool fibres are bonded together to maintain bounce and prevent slumping, ensuring insulation stays in place and energy bills remain low over time.
• Truly Breathable: Wool naturally absorbs and releases moisture to balance humidity, helping reduce condensation risk and keeping your home warm in the winter and cool in the summer.
Thermafleece UltraWool is our denser insulation slab that is designed for use where space is limited. The insulation is designed to friction fit comfortably between studs and rafters.
Below, you will find our downloadable application guides. Tailored for walls and warm roofs, these resources are designed to ensure the most appropriate use of UltraWool.
Insulating Walls with UltraWool Insulating Warm Roofs with UltraWoolThermafleece UltraWool is our denser insulation slab that is designed for use where space is limited. The insulation is designed to friction fit comfortably between studs and rafters.
The lower thermal conductivity can help achieve lower U-values or improved acoustic performance at relatively low thicknesses.
Made using British wool and thermally bonded for strength and durability, it delivers long-lasting performance you can rely on.
Thermafleece is a British-made, sustainable insulation rich in British sheep’s wool. It is a natural fibre insulation designed to be highly breathable and provide long-term thermal and acoustic performance.
Thermafleece uses wool from hardy hill and mountain sheep in England, Scotland, and Wales. The sheep run free on fells and mountains and are shorn annually in the spring.
Thermafleece UltraWool Slab is non-hazardous and can be handled without protective clothing, although we recommend you wear PPE in spaces such as lofts.
It is important to take the time to calculate how much insulation you need to ensure the best fit and avoid over or under-ordering. Planning the installation is an important part of the job, and correctly installed insulation will significantly improve thermal performance.
Visit the Information & Advice page to calculate the quantity needed for your project.
Insulating your loft with Thermafleece sheeps wool insulation is a great DIY project. Because of its denser structure, UltraWool is ideal for insulating walls and roofs.
Read our walls and warm roofs application guides to see how UltraWool can work best for your project.
All of our products are available for nationwide delivery. You have the right to cancel your order up to 14 days from receiving your goods.
Buildings like to breathe and unlike synthetic materials, wool is naturally designed to be truly breathable. It doesn’t just sit there; it works hard. It absorbs and releases moisture, helping manage humidity levels and keeping your home warm in the winter and cool in the summer.
Think of your home as a secret weapon against climate change. It’s a simple cycle: grass captures carbon, sheep eat the grass and convert it to wool and we turn that wool into insulation. By putting UltraWool in your home, you’re locking that carbon away for decades.
We’ve all seen old insulation that looks flat. To prevent that, we take our British wool and bond it together. This keeps the wool bouncy and perfectly in place, so it won’t slump. It’s the “Science meets Nature” secret that ensures your energy bills stay low for a lifetime.
Wool is a natural filter. It actually captures and “traps” many common indoor pollutants and chemicals, acting like a silent air purifier for your building fabric.
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We source our wool from British farmers who meet world-class animal welfare standards. Because it’s local, it doesn’t travel across the globe to get to you, keeping the “carbon miles” incredibly low.
UltraWool comes in easy to handle packs and isn’t “itchy” like old-fashioned glass wool. The insulation can be easily cut to size using an insulation saw and friction fits between rafters and studs.
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Use the calculator below to estimate how much UltraWool insulation you will need for your project. It’s a simple guide to help you calculate the quantity required before you order.
| Item | No. Packs | Sq.m/pack | Total Sq.m |
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Thermafleece is so versatile it’s been used in properties of all shapes, sizes and ages. Take a look at the variety of properties that have used Thermafleece over the last 25 years.
For us, sustainability requires more than just natural materials; it requires accountability. We believe in products that are demonstrably better for the environment.
Thermafleece is an excellent insulation product that makes great use of British wool. It offers excellent thermal performance while allowing the building to breathe, helping us meet building regulations. Installation was quick, simple and safe, with no fuss.
We are great fans of Thermafleece CosyWool sheep’s wool insulation & have used it for approximately 20yrs. It is so much more than a quilt insulation. It’s ability to control vapour within a structure is outstanding. Plus it’s so nice to handle!
The thermafleece cosywool sheep’s wool insulation was amazing to work with and very easy to lay. We noticed the difference immediately and are super pleased with its performance so far. Service from ordering to delivery was excellent.
Meets all insulation and regulation requirements beautifully. So much better than other man made alternatives. So much better to install. Far more healthy from many angles – especially installation – no irritating particles.
My loft was insulated with fibreglass, which required me to wear a face mask when entering the loft, and I needed to replace it.
As a sheep farmer, I looked into using sheep’s wool. I thought that this was the right thing to do environmentally, “walk the
UltraWool is an excellent sustainable product. Being sourced and manufactured in the UK helped reduce our project’s carbon footprint, and it was safe and easy to install without the need for special protective equipment.
Lovely to be using a natural product. Not sure we had the right tools to cut it, but managed with scissors and persistence! Used to insulate the summer house in the garden – feels very cosy in there now.
Insulating with UltraWool signigicantly reduces the amount of energy lost from the building envelope, reducing energy consumption and carbon dioxide released to the atmosphere
Breathable natural fibres contribute to a more stable humidity and moisture lev
Felt the Difference all most right away.
Beyond its fantastic and self-evident insulative properties, the most remarkable thing for us was how pleasant Thermfleece insulation was to use. It turned the job of insulating from a messy, uncomfortable and unpleasant task to one we genuinely looked forward to.
Choosing a natural insulation product was a key priority for us, and Thermafleece CosyWool proved to be an excellent choice. We liked that it’s British made and supports local farmers, while also allowing our older property to breathe naturally.
CosyWool is a versatile insulation rich in British sheep’s wool and the ideal choice for all round performance and value for money. The wool rich blend ensured the full benefit of sheep’s wool with enhanced performance, durability and sustainability.
The moisture wicking properties together with the air purifying quality of CosyWool are the real reason I always choose it, allowing the building to breathe and removing toxins from the air make it the obvious choice.
fantastic to work with
This stuff is so much easier to install than rockwool, fibreglass or celotex.
Great product. Very pleasant and easy to use.
Simply excellent! Gone are the itches of fibre glass loft insulation instead a natural product of sheep’s wool, wrapped around your house for warmth. Must try a wool jumper again myself!
Great price and product
Thermafleece insulation has transformed our house. It was easy to install in our attic – we did it ourselves – it was all done in a day. Best thing ever.
No irritation from the sheep’s wool, made the room warmer straight away.
Worth it just for the abilty to breathe while using it and not getting itchy. Rips apart easily with hands or decent scissort. Excellent Product.
So easy to work with and has made a real difference to the warmth in the room below. Will be looking to replace all our loft insulation with this
Excellent quality insulation.
Effective and easy to use, fast and great service.
I’ve used the wool insulation for my campervan conversion very happy with the with the product
Great to handle and very easy to install.
Exactly as described, perfect for the job I was doing.
Excellent product, service, and delivery
Good price for item that we have used before. Straight forward order and delivery.
Really helpful with getting the right amount and overall great service, super range of products. about to buy again!
We understand that choosing the right insulation for your project can be daunting. That’s why our team is on hand. We offer impartial and truthful advice as well as providing general and technical help so feel free to submit an enquiry via our contact page.
Alternatively call us on 01768 486 285
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