"Doctor Drivel" wrote:

The R factor of some of it is quite high. Celotex and Kingspan and others,
have all the details. As you doing up a room installing this sort of
insulation adds value and eventually you may have far less need for heating.


I am refurbishing a small downstairs cloakroom and don't want to make it
more cramped than it already is. I planned to strip the plaster,
install 10mm Celotex and then dot and dab plasterboard over it.

Now I think I will use 20mm Celotex and skim it. The performance of the
20mm versus the 10mm is significantly better, plus my local builders'
merchant stocks it, whereas the 10mm would have to be ordered in
specially and costs almost the same price.