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John, of course you are right. However, from an environmental viewpoint processing and transportation from source to installation are also key elements in material selection as well as thermal performance. Wool wins on these counts. What is your experience in using Asbestos as loft insulation?

Thanks for your reply. One advantage of wool is that it is completely natural and so suits my environmental standpoint. I had not heard of problems with moths before though. Cheers

I am in the very lucky position of having a large loft with nothing stored in it. Glass fibre Insulation has been put down between the joists at floor level. I have a very large air space above the insualtion and below the underside of the roof. Should I add lots of additional insulation at...