Wet Room Problem - Grouting

[plug_it_in]

As a newbie to a Wet Room I have just inherited I am hoping you can help me. I have a 2/3 Bar shower and its blasting the grout out between the tiles. I patiently got all the grout out using a dremel directly under the shower head . Left for a week to make sure it was dry, re grouted with BAL large gap grout . Its now all come out and older grout has also eroded out. Adding to this that I have a pink mold problem that stains the other grout and I have to bleach on a regular basis to get it back to looking decent . So two problems I would love to fix. The grout and the staining.

So I went to Topps and asked. They sold me more BAL - product called Micromax and a Grout protector by Fila .

I am still suspicious this may not resolve the problem. As I have to dig out all the old eroded area of grout I would love to get this right.

This is an upstairs bathroom . Tiled on Wooden floor - I think with plywood underneath but cannot guarantee. The floor does move when I stand on it , and water is coming back up through the grout when Im standing on it after a shower i.e. there is water underneath the tiles. I am hoping the tanking is protecting the substrate . The floor moves .

My recent thoughts have been . Let it dry out and then use Kerapoxy - but I have seen in other posts this may crack and should not be used on floors that move.

Any suggestion/solution greatly received. I have searched the forum but cannot find a definitive answer .

 

[Gazzer]

If the floor is moving you wont solve anything by regrouting. Its a rip out job !

 

[plug_it_in]

Thats very depressing . Is it possible to get a completely rigid floor on wooden joists in a normal upstairs bathrooms or should I go for a tray and walk away from tiling completely ?

 

[Gazzer]

Yes its very possible but without knowing more its hard to say what you need to do. There should be no deflection in the floor , it wont matter if you have a tanking system or not while the floor is moving.

 

[plug_it_in]

OK time to get a professional in ........ my poor house is plagued with cowboy and cheap work. Most I can handle , but I want this done so its 100% top notch. Thanks for the advice.