Grouting loose in bathroom floor tiles

I have a problem with grouting coming loose from bathroom floor, the bathroom was fitted two years ago and have had to call back fitter twice as grouting is coming loose, now called out a third time and he is saying the joist are moving causing the problem.

The house was built in 2016, it is a wet room shower with a protective tray underneath shower to reinforce it, the grout is only coming lose where there is traffic in the room.

Have you any ideas or a soluion?

Asked by Peter James on 21st Apr 2026
Expert Trade Answers
"Hi,
Cannot ask what preparation before tiling was done?
There could be issues with how the bathroom floor was tiled in the first place. Another issue could be the type of grout that was used, it needs to be a flexible grout to allow for some movement. Are there any hollow sounding areas under the tiles?"
Answered on 21st Apr 2026 - Member since Jan 2026 - report
"Try using a flexible grout or is possibly there's movement in the tray( not fitted correctly."
Answered on 21st Apr 2026 - Member since Feb 2026 - report
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