"Christian McArdle" wrote in message
et...
Thanks Andy, you've confirmed my gut feeling about losses, and also
that one episode of tripping over a pipe and putting a foot through
the ceiling will take a hell of a time to balance against the extra 8"
insulation.

Consider using Kingspan or Celotex. Although more expensive that rockwool,
100mm will give a lot more insulation that rockwool. It is also longer
lasting and less prone to sagging and soaking, as it comes in solid blocks
looking a bit like expanded polystyrene. You can board straight over the
top.

Best put Rockwool up to joist height then lay Kingspan over then loft
boards.


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