Shower wall prep problems

[Rich H]

HI All
Hope someone can help on this, we moved into a new property just over 4 years ago and within a month had water coming through the ceiling from the en-suite. (quality workmanship!) Various fixes occurred and it looks like the one put in place just stemmed the fault as we have the same issue.
The bottom of the water resistant plasterboard was very wet behind the first row of tiles tiles and the paper ripped, damaged. I have removed the tiles and are going to use shower panels to seal the shower.
Questions are
Do i need to replace water damaged board areas ? or options to seal and re- 1.jpg 2.jpg plaster ready to fix panels to wall
Can i fill in holes, sand old adhesive left and reskim ? The brown areas are water stains on the walls and brush off - plaster does seem softer here
Any advice grateful
cheers
Rich H

1.jpg (68.8 KiB) Viewed 1962 times

2.jpg (67.11 KiB) Viewed 1962 times

[aeromech3]

I think you know that the shower panel idea is again only likely to stem the problem; leaving the damaged "water resistant" plaster board area could lead to mold and smells; for the water to have gotten behind the tiles and down to the next floor the tray has not been fitted correctly and I suspect more than likely there is a drain plumbing issue for water to appear on the below ceiling.
I would recommend, tray removal, board replacement as for sure after 4 years there could be rot underneath.

[Rich H]

Many thanks for the reply

[dewaltdisney]

Looking at the pictures, the tray has an upstand and if the tray is let in flush with the wall then the tiles (or wall sheet) can overlap then water cannot get through the usual leaking point between tray and wall. It is hard to see if that is the case here but he staining would suggest that is the case. Is the tray a stone resin or is it a more flexible type? The acrylic trays are prone to moving about with weight which can allow a fissure to open up along the joint line if you are relying on silicone bead join.
The best practice is to cut out a section of damaged board, replace and skim over to get it all even. When the board is removed you can check that there are no other issues to sort out. Tray movement must be eliminated even if you replace it with a stronger type if necessary.

DWD