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Thanks Mountainwalker - which mountains? Plse could you also tell me - is it true that you should use celotex on the dormer where there is no outside brick wall but that you can just use the fibreglass wool in the bits where the outside is brick or thermal blocks (ie the raised gable end or...

Hi can anyone tell me - are they the same thing ie just as good as each other? Also if you are insulating a loft extension and you use regular yellow wooly insulation (I don't know what it's called!) in the walls is it as good as celotex - can you mix and match - and can you reuse old yellow...