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What would be the best way to insulate the vertical dry walls in the attic? Batten on top of the existing wall and insulate between battens, then plasterboard over. Or attach combined insulation/plasterboard over the dry wall. Or pull down the dry wall, insulate and replasterboard?
Decisions, decisions....
Is it a habitable room? If not, just insulate between/over the joists, no point insulating the vertical walls if you are not heating the attic.
It will be a bedroom. Think Ill take the plasterboard down, insulate between the vertical joists and over it.
If it's going to be a bedroom, make sure the existing ceiling joists are up to the job of being used as floor joists first.
If it will be a bedroom look at what building regs say
Agree with trail rat, if you don't know the building regs you will probably end up with a 'box room' when you come to sell, which either adds no value, or causes hold ups at survey when your buyer realises they are paying for a non-bedroom.
I assume it's already converted?
Can you crawl into the eaves space? I'm going to be doing the same in my attic room, and will crawl back there with some kind of insulation and screw it over the joists rather than try and fit it between them.
How much space do you have to lose?
Presumably your making more liveable space. Â Assuming it's for you not resale per se.
If you can then I'd pull off one side and ...do any electrical work then stick some Kingspan or similar in and re plaster board.
You still get conduction through the joists unless you do something about that as well but just sticking in the foam insulation alone makes a huge difference.