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Andrew Gabriel

In article ,
writes:
Can anyone help? We are wanting to insulate between the rafters of our
attic roof which are about 90mm in depth. It is an old house (1900),

Why are you wanting to do this?
If you just want to insulate the storage space, then 25mm sheet
screwed to the rafters would be fine, and you will get nearly
all the same benefits as a thicker layer as the benefits don't
scale anything like with the thickness.
OTOH, if you are looking to insulate as part of a loft conversion,
then you'll need to conform to building regs requirments.
Also, what if any loft insulation if there already?

--
Andrew Gabriel
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