Discuss Help! Grout Has Cracked In Bathroom in the The Welcome Forum area at TilersForums. USA and UK Tiling Forum

S

Sienna

Hello all, I'm Sienna based in North London!

I've had serious problems with a tiler I found on mybuilder and what I've been left with is a bathroom floor which has a heck of a lot of movement and the grout has all cracked.

It's a high water area so obviously I'm extremely worried and it all has to be ripped up. It's a tiny space - only 18 x 33cm square tiles - but the tiler said he would come back twice and then disappeared. He also tiled the WC, and there is movement there too but the grout hasn't cracked (I'm less worried about the movement as there is no shower or bath in this room, but maybe I should be worried?). The problems, I think, are these:

1) He didn't secure a loose floorboard. He then blamed me, saying 'I expect a customer to know their own floor'!!! God forbid he ever works with any of our elderly in this country, or anybody who isn't a tiling expert in fact!

2) He used ditra on top of floorboard and that's it.

Should the floorboards have been removed entirely and replaced with thick ply? As it is, there is a ledge and floorboard and ply would leave a ledge of about an inch!

Would Hardie backer work on top of the existing floorboards? Or not thick and secure enough?

Is the safest way to replace the floorboards with 25mm marine ply (and with ditra as a decoupler on top? Or no ditra?)

I've heard some people say that ply, even marine ply, is inappropriate in a bathroom. What then is appropriate?!

I really would appreciate any help. I'm starting to lose faith in humanity! Expect to see me a lot around here in future because I'm determined to do some of the trade myself. I have so much tiling to do and this guy was such a thug, and most likely will skip the borders back to the EU if I small claims court him, I'm too burnt to hire anyone ever again!!!
 
OP
H

hmtiling

Ditra on top of unsecured floorboards was never going to work. Unfortunately, you've ended up with a cowboy.
If, after all floorboards are secured, the floor is deflection(bounce) free then overboarding with hardie or no more ply would be adequate. An s1(flexible) adhesive should be used to fix the tiles and a flexible grout.
 
OP
S

Sienna

Thank you hmtiling! Is it likely that the floors will be bounce free? It's one of those horrid 1930s mock tudor houses up at the top end of the jubilee line.
 

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