Hi Tony
cheers for that,, but i need a degree in nucular physiscs to understand it:unsure:
end of the day all builders i know and work for put it in,, also redrow, who are building at the back of us put it in,
my building construction is.. 100mm concrete block rendered, 50mm cavity thermolite block,, 9mm plaster board... some of the outside walls are stone...
and its cold