On 18 Jun 2004 20:49:59 +0100, John Richer wrote:

So your interesting idea of cross laying new timbers and insulation
is intriguing ...

Two benefits. Less heat loss through the timbers as mentioned by
someone else with 200mm it starts to get significant. Spreads the
load.

Thanks for raising this - but is it really an issue in this location
- a ceiling void?

Your lath and plaster ceiling has no DPM so the warm damp air will be
getting into a cooler area. Mr Taylor is correct that any condensation
will be on the cold side of the insulation but unless you are covering
the whole ceiling area there is going to be somewhere with less
insulation or where the warm air gets into the roof void proper.

I personally think that fitting rigid insulation in the confines of
loft will be a PITA...

--
Cheers
Dave. pam is missing e-mail