Tiles changing colour ...

[Gtace36]

Hi

I have just had a new bathroom installed moving from a bath to a shower, the walls were stripped down and new boards put all around where the shower would be. We have a shower base, and use tiled walls as our shower walls ... Pictures further in post...

A tanking kit was the used on the same walls, and a sticky piece of plastic stuff? Applied to the base of the shower tray, up the wall. Where the tiles meet the shower tray it is grouted using Mapei grout, then has clear silicone over the top (side issue, this makes my grout go a dark brown colour? This can be seen going up the corner join on the photos )

Over the last 2 weeks the bottom 4 tiles have been changing colour, and the grout has also been changing colour, as though staying wet.
so I've taken the sealant and grout out from where the tiles meet the base, and found it to be wet, although this is annoying as something is going wrong, does this suggest the tanking is doing its job, as it is holding water at the tile/base join??

so the point of my thread is will these tiles dry themselves out? Or do they need to be replaced??
thanks

 

[Andy Allen]

looks like the grouts falling out and waters getting behind the tiles..

 

[Tony73]

Agree with Andy, water getting behind tiles

 

[Gtace36]

Those pictures are in the wrong order, the one with no grout in is my handy work removing the grout
I've had clear sealant over the grout since I first started using it, it does appear as though the grout has failed at the base, however should the sealant not have kept the water out anyway?
Thanks

 

[Rizzle from the Portizzle]

it does look like the water is getting through the grout joints being pulled in by the adhesive not being cleaned back before grouting ie you have a mix of grout and adhesive in the joints with the water taking the easy rout in to the adhsive scape out the joints clean back allow tiles to dry out then regrout leaving no adhsive coming throught if tiles dont dry out remove and replace .it mite be worth checking the glaze on these tiles for grazing to do this get a black felt tip pen and draw lines up and down and left to right leave for a few hours and see if you can remove the lines if they go into the tile the glaze is faulty remove and replace but test the new ones before refitting