Best Flexi grout?? - TilersForums.com

[Ian]

You say the grout is cracking, are there any tiles loose? They normally go hand in hand. I'm not convinced a re-grout will solve the problem if there are, as mentioned above, underlying problems with the substrate.

 

[jonboythetiler]

There were NO loose tiles, when i checked on Monday to my surprise!

However i did change 1 tile about 4 weeks after doing the job, it was the very first tile as you walked in the bathroom, the grout had cracked around it like the rest, but i just put it down as 1 of those things, heavy traffic or not stuck down properly. I remember having a right job beating the old adhesive out, because of the UFH. But when i looked on Monday it was fine. i will take a few pictures on Friday and post them up, so you can see for yourself.

 

[grumpygrouter]

To have a 2mm joint on a timber floor with UFH has, IMO, been part of the cause of the cracking. BS states a minimum of 3mm for floors anyway and when you add a flexible substrate with UFH I personally would have gone no less than 4mm. But, as it is already down I don't think you have many options in your remedial actions. BAL standard grout with GT1 admix or Ardex stuff with their admix may well be the only way to go. I do feel though that the problem will re-occur because of the substrate and the joint width.

 

[pete f]

as above 9mm ply is the issue here if its re grouted im sure it will fail again

 

[jonboythetiler]

Well i've just returned, and had a tile up, the latex has pulled away from the ply. I don't think i have ever seen that happen before, the latex is well with-in normal thickness 5-10mm, but it has cracked and lifted. it appears to be half the floor that is effected. I have asked the customer if they have had any works done to the house, which they assure me they haven't. I no they have had a set of french doors fitted to the rear, so i thought maybe the building company used stilts to support ceiling which may have pulled the floor out of shape. either way, the only for this to be fixed is to have the loose tiles removed and re-layed. Is it possible to hack away the loose latex around the UFH (about 3m2) and put another coat of latex down?

As I'm still unsure wot has caused the latex to lift, I'm worried that I'll do all this work, and it will happen again?
I want to put this right, but at the moment it has cost me a days wages so far, and i don't want to continue the works for free, if its not my responsibly.