As a bye the bye, I have the roof insulated between the joists with 300mm. Anyone know if there is an advantage in also inserting insulation directly between the joists under the roof or is this overkill?
I presume, Horusd, that you're talking about doing something like putting insulated plasterboard on the ceiling, under the existing insulation and joists. It'd be of benefit alright as it'd prevent cold bridging, caused by the joists.
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