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Thanks for the replies, to answer your questions. The walls are made out of marine ply and are screwed to the stud work. Tile spacers were also used so there was a reasonable gap to grout into. The 3rd wall is a regualr brick amd plaster wall and it has no problems at all.

My shower cubicle has 2 plywood walls that have been tiled. The grout joints on these 2 walls keep getting hairline cracks low down where it gets wet the most and this is now causing some tiles to move and loosen, probably due to water getting in. Any suggestions on what can be done to cure the...