Splashback panel popped out of joint

Hi, it may be worth finding out why the panel has popped out to begin with. It may not be flat and uniform enough underneath to keep the panel in position. The best bet would be to remove the panel, have a look underneath and re-fit it with silicone adhesive once you are happy the surface is nice and flat.

Hi, Remove the panel, which is dislocated Make sure back of the dislocated panel Is dry, also the wall, where the panel you will be fitting. If this is a panel which was cut to a smaller size fit. You need to Make sure that it was cut correctly. If you are happy with all above, apply Silicone on the back of the panel either in S shape pattern from top to bottom. Or dab on the silicone approximately 15cm apart cover the back of your splashback panel and stick it on. And make sure that it fits perfectly.

Remove the panel. The underlying surface needs to be flat clean and dry. If it is then apply silicone or a suitable adhesive to the back and a silicone bead in the joint. If the backing surface is not suitable to fix to remove it back to the brick and fix moisture resistant boards flat to the wall before refitting the panels. Seal all the joints with a bathroom sealant.

If you have no way to contact him then you’d be best to hire a competent bathroom installer to remove the panel and investigate the cause and put it right. You might want to get him to check everything else, as far as is possible too. If this guy didn’t get this part of the job right (which is relatively simple) and then did a disappearing act, I’d be worried about what else he cut corners on ! Whatever you do, don’t just stick it back and hope for the best. Water seeping down the walls (depending on what the walls are made of and if the guy used the correct waterproof backing board etc.) over a period of tone can cause serious structural damage by rotting the timber floor joists etc .