damp wall

[atec]

i would take the plasterboard down ethier put up new plaster board and tank or preferably replace the plaster board with aqupanal or simular.

 

[Corky]

Personaly I don't like using ply on walls, If water ingresses in the ply your grout can turn brown from resin in the ply. If you used ply I would tank it

Thanks for the tip Whitebeam.