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So the short and honest answer to those questions are
- I don't know and 2. I don't know
The slightly longer answer would be
- Probably the worst he can get away with and still satisfy building regulations and 2. Not if he doesn't have to re: building regs....
There does seem to be a hell of a lot of that Celotex stuff going in :-)
- I don't know and 2. I don't know
graunch
What U rating is the loft conversion supposed to be?
Contractor using air-tight tape on all joints between rafters and insulation?