Water damage repairs and rotted timbers go together, if you don’t get to the bottom of a problem and dry it out quickly new softwood stud walls tend to decay very quickly. Using dehumidifiers can help the drying process however striping out all the water damaged plaster walls and insulation helps let the air circulate.
On this project we will be tanking the room and tiling over all the walls.
The presser these days on space in London tends to force excessive use of shower and wet rooms as these are normally above oneandother water damage to the flat bellow is very common.