Bathroom wall tiles - grout cracked and tile 'moving'

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15 Jan 2020
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Heya guys,

I have a shower over a bathtub, tiles on 3 walls, and a crack in the grouting going horizontally just above the first tile above the bath on 2 walls out of three.

I thought at first, just normal movement over time - dig out the grout and redo it, so I got some supplies to do that..
.. but, I am able to push my tiles and they give a little 'wiggle' forwards and backwards against the wall.

So I am thinking this probably needs me to pull many off the wall and check what's behind there right? How well they are attached to whatever is behind there (I have no idea what proofing system the previous owner used).

Am I right in thinking this?
Any tips/suggestions would be welcome to evaluate this situation without destroying my bathroom.
 
Wall behind not being tanked and it's wet.
Take tiles off and restart.
Sorry for you.
 
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