If the eaves space is dry and well ventilated, then you shouldn't need
anything else there. If you intend to board up the back and front of the
partition wall, with lagging in between, then you would need some sort of
moisture barrier to stop the warm moist air in the room itself from damaging
Try using foil backed plaster board instead.
Yes, unless you use plasterboard that already has one.
If you put warm, damp air on one side of an insulator with cold on the
outside, then there _will_ be a point somewhere inside the insulation
at which the condensation point is reached.
Use vapour block. The rockwool in the unconverted attic should also have
vapour block. Obviously, this is frequently overlooked, but then you do want
a proper job, not a bodge? Foil backed plasterboard isn't *that* expensive.
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