Apologies if this question has been answered before, but as we most problems, it's hard to know if someone else's issue is the same.
We have damp on a party internal brick wall (our side is most probably a extension, neighbour is most probably sandstone). So I thought I'd best strip it back and have a look, here's what I found:
1. Pulled off plasterboard.
2. Behind that, batons nailed to the wall, behind those, plastic sheet, then plaster top coat, with bonding plaster first coat, then bricks.
I have a moisture meter, and the dampness seems to rise up to about 1.5m, some of plaster has/is coming off the bricks.
Here's what I think I should be doing, could somebody please confirm this is good practice
1. Pull off any loose plaster from the bricks
2. Fill any holes and make good any areas with bonding plaster (do I need a top coat?)
3. Paint over with bituminous paint.
4. New batons 1" x 1/4" (screwed into siliconed holes or just nailed?)
5. Plastic vapour barrier
6. New Plaster board starting about 1" up the wall to leave a gap at the bottom?
Do I need to be using insulation backed plaster board? Ideally I don't want to lose any more room width than I have to.
many thanks
Matt