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Sheeps Wool Insulation, a Sustainable, and Environmentally Friendly Insulator

Updated on January 28, 2016

Keeping Cosy with Sheep's Wool Insulation

I recently came across an article about a lady who was living in an energy efficient house that she'd insulated with lamb's wool. This immediately captured my attention, as we are planning to insulate our house before the winter sets in. These days you have to do everything you can to keep the heating bills down, and living as we do, in a high-ceilinged Victorian House, that can be doubly challenging. A staggering 50% of heat loss in a typical home is lost through the roof, so if you're going to reduce your carbon footprint and make your home warmer this is a very good place to start.

Anyway, I decided to do some research into this form of insulation as I like the idea of choosing a low carbon solution that comes from a natural and sustainable source. After all, even if it doesn't grow on trees, it does grow on sheep! Soon I discovered other news stories about sheeps wool insulation, including one about the Bodleian Library in the University city of Oxford. Housing over 8 million rare and valuable books, the Bodleian is one of the most prestigious buildings worldwide, to have been insulated with Thermafleece, British sheepswool insulation. Oxford University Estates specifically selected Thermafleece because it is inherently compatible with traditional building methods, as well as having full building certification through the BBA. An extra consideration was the breathable attributes of natural wool fibres. The fact that they absorb and release moisture was a key factor in the decision.

Well, the more I found out about Sheeps wool insulation, the more I liked the sound of it. Here are some more of the benefits:

  • Sheeps wool insulation (Thermafleece) is if course very warm, but it can also be used as an acoustic insulator or sound insulator, both in the home, and in caravans, motorhomes, sheds, out-buildings, and also garage doors!
  • Sheeps wool is good at dealing with humidity or dampness, as it can absorb moisture from the air, then release it later, without going mouldy, and meanwhile it actually generates heat whilst moist. (A big plus for sheep?)
  • It's naturally fire retardent (Also a big plus for sheep!) Wool does not readily ignite, it just smoulders, so this makes it an ideal insulant for timber framed properties and homes with thatched roofs.
  • Sheeps wool insulation (Thermafleece) breaks down formaldehyde, a known carcinogen, into safe molecules. As many materials commonly used in construction contain levels of formaldehyde, this is very helpful.
  • It's non-irritant (unless you're allergic to wool) so can be installed without special gloves or masks. The kids can even give you a hand! Have you ever tried handling the fibre glass alternative? Not so pleasant, believe me!
  • It's available in a choice of thicknesses.
  • It is a natural product

More effective than glass wool or mineral wool

Sheep's wool has a very low conductivity, which effectively means that heat has a hard time passing through it. Laboratory tests have shown this form of insulation to be more effective than both Glass Wool or Mineral Wool. In a real-life situation, where humidity is also factored in, the results are even more impressive.

In existing houses in the UK, attics are required to have a minimum of 120mm insulation where sheeps wool is used. For new-build homes, this increases to 240mm thickness.

For internal thermal/acoustic purposes, suggests a thickness of between 80-100mm between stud partitions, and for dormer/cathedral ceilings, a thickness of 200mm is recommended.


What happens if I already have insulation, but it's too thin?

If you already have insulation in your attic, but it's been there quite a while, and it's the typical mineral wool or rock wool, the chances are it will have settled over time, and may not comply with new depth regulations.

If this is the case you can either take it up and replace it, or lay the new sheep's wool insulation over the top. Remember if you do take it up, it's a good idea to use gloves and overalls, and possibly a mask to protect against all those itchy fibres. Overlaying with sheep's wool has the benefit of not redistributing the old itchy fibres around the loft space!

Sheep's wool insulation( also known as Thermafleece) has an extremely low environmental cost, unlike some of it's competitor products, so it's definitely a very 'green' choice, quite apart from all the other benefits.

Further information about sheeps wool insulation (Thermafleece) can be found in wikipedia;


What should I insulate, the floor of the attic, or the roof?

Ideally, insulation should hug your living space for maximum benefit. If your roof space is only used for storage, then insulate the floor. This saves the added cost of heating the whole attic. If, however, you have a loft conversion, follow the shape of the roof to ensure heat retention.

What about my water tank & pipes?

Water tanks and pipes need to be well insulated in severe weather conditions to prevent damage to plumbing. If you've insulated the floor of your roof space with Thermafleece, then you should certainly consider insulating the water tank, water tank cover, and pipes in the same way. Remember to leave the space beneath the tank uninsulated, so that warm air can percolate up from the heated part of the house, thus helping to keep the tank from freezing.

The first part of an excellent series about creating a 'greener' home.

Sheeps Wool insulation being installed in a house in Wales

Insulating National Trust properties in Wales with Sheeps Wool Insulation


Submit a Comment

  • Amanda Severn profile image

    Amanda Severn 3 years ago from UK

    Hi Oliversmum, I think it's one of the best forms of insulation because of it's natural temperature control properties, and also because it is naturally fire retardant. Hope you're able to find this product in Australia!

  • oliversmum profile image

    oliversmum 3 years ago from australia

    Amanda Severn Hi. It never entered my mind to use wool as insulation. We don,t have snow where we live,but it gets very cold in winter and so very hot in summer. This would be an excellent way of keeping costs down and a whole lot better for the environment. Thank you so much for all this great information. Thumbs up and very useful. :) :)

  • profile image

    callum 7 years ago


  • Amanda Severn profile image

    Amanda Severn 7 years ago from UK

    Thanks for stopping by and commenting Tonyhubb.

  • tonyhubb profile image

    tonyhubb 7 years ago

    Very good information, thanks!

  • Amanda Severn profile image

    Amanda Severn 8 years ago from UK

    Thanks for stopping by BristolBoy. Sheeps Wool is a great insulation material, and I hope you find the info useful at some point!

  • BristolBoy profile image

    BristolBoy 8 years ago from Bristol

    This seems like a really good idea and I will definately have to remember it if I ever do any work on a house, although I also like the option of hay bale houses.

  • Amanda Severn profile image

    Amanda Severn 8 years ago from UK

    Hi John

    Wool is a wonderful thing. Very warm and practical on many levels, as well-as being fire-retardent, and easier to use than many of the man-made alternatives. Thanks for stopping by and commenting.

  • johnr54 profile image

    Joanie Ruppel 8 years ago from Texas

    This is quite interesting. I had never thought of using animal products for applicatons like home insulation, but I suppose that given how warm a simple thing like a wool sweater can keep you, that it makes sense.

  • Amanda Severn profile image

    Amanda Severn 8 years ago from UK

    Thanks Beverly. Being UK based I concentrated on what was available here, but I'm glad you found the info. useful.

  • profile image

    Beverly 8 years ago

    Thanks, this is very helpful. I also found a Canadian manufacturer: