anhydrite + big leak : (

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Brindle

Hi, tiled a new house back in the summer, guy rang me yesterday to say couple of tiles loose on one bathroom floor. After recovering from a heart attack (ettringite paranoia! :yikes🙂 I popped to have a look.
Lifted the loose tiles and loads of water underneath, after further inspection it appears his shower (very high pressure/water flow rate) has been leaking a serious amount of water which has found its way from under the tray...under the tiles on two sides.

Prep wise, I followed recommendations for screed i.e laitence properly removed, primed x 3. On lifting the tiles, the backs of them are 100% bonded to adhesive but looks like you can see a surface of anhydrite and primer. I have tiled other screeds in this way, hoping they don't get any leaks..eeek!
Floor now being dried out, leak fixed, I might go for some Gypfix to re lay this one now

Having never had any tiles come loose, I was surprised that this leak caused the tiles to pop so easily. I have seen popped tiles similar to this after a leak on a concrete floor too, laid years ago by someone else, but again a long standing leak.


Bob
 
Good morning Bob, this is one of the reasons anhydrite screeds are not recommended in wet areas (I'm aware that this is not to meant to be a wet area that you are dealing with). I have tiled a wet room on this screed before and completely tanked it before tiling to avoid this exact issue. I would say that so long as you fix the shower and let the affected area dry out before refixing the tiles your problem will be solved, and yes, use a gypsum based adhesive if you can.


Sent via Tapatalk for iPhone
 
Agree with Bri. Lift the tiles, dry the screed. fix the leak and retile.
 
Sound, thanks folks, it is drying as we speak, and Gypfix for definate : )
Horrible episode!
 

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