In article , ZeitGeist
writes
On Wed, 07 Jan 2009 21:05:21 +0000, The Natural Philosopher
wrote:

(snip)

Many thanks for the info. Wil try and get round to it as soon as the
weather warms up a bit :-))

Celotex is the easy option but you could do it for a lot less with
rockwool,
you have plenty of working space and will have plenty of joist depth to
take the less effective insulation. You can support Celotex with slant
driven 4" nails or rockwool with hardboard and battens.

I have done this with fibreglass and didn't bother with the vapour
barrier.
--
fred
BBC3, ITV2/3/4, channels going to the DOGs