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I would probably go down the overboarding with insulated plasterboard. If you have the head height it’s by far easier. You’ll end up cursing the day you thought of laying insulation from underneath with only a small section open (it bunches up like a fuckers and you’ll never get coverage good enough to avoid cold spots.
andos
gillies
I have a section of a room where the ceiling is approx 50% protruding beyond the main building, with the rest within (underneath the upstairs bathroom and bedroom)
The bit that protrudes is pitched, and there's a fair gap between the ceiling and the roof. I want to insulated in that space to reduce heat loss - we're getting new windows and other work done at the same time anyway.
I was going to cut a section of ceiling away and then lay insulation between the joists. The builder has proposed using insulated plasterboard and boarding over the whole ceiling instead.
Are there any issues with that? Should I use some hygroscopic material like woodfibre boards to avoid any moisture problems? Or is a standard insulated plasterboard fine?