Best Flexi grout??

[jonboythetiler]

Hello everyone,

I've tiled a bathroom floor, in a large format porcelain tile, however im having problems with the grout cracking over time. (job done about a year ago) the joints are 2mm wide, and the grout used is bal super flex. (yes i know it should only be used on joints at least 3mm wide)

The floor has had 9mm ply put on it, primed, and had a coat of latex put over a heat mat.

do mapei have a decent flexible grout, that would be more suitable?

 

[kilty55]

hi jon,i would be more concerned why the grout was cracking....you may be right it may be as they say it should be 3mm minimum however 9mm ply isnt thick enough and that may be your root cause

try bal non flexi grout and mix it with gt1 admix tghis is the strongest solution i can come up with hope it works let us know

 

[DHTiling]

I think it might be substrate prep that is the problem here.. if you have deflection issue then the grout will crack, no matter who's brand you use.

 

[jonboythetiler]

I must admit im nervous of the job, when i had a look today about 6 tiles had the grout cracking around it. But not in the high traffic areas which was surprising to me. I also noticed large amounts of cracking over the skirting boards, and she said they've had a lot of building work done to the house, which maybe the cause. But i dont want replace the cracked grout with the same stuff if its only going to happen again. I do have some gt1 in the van, just dont like using the stuff!

 

[DHTiling]

So you didn't tile it originally.?

 

[White Room]

As said there could other issues causing the grout to crack.

 

[jonboythetiler]

Yes i tiled it last year, the couple were doing the house up at the time, new kitchen etc.....

Im normally very good when it comes to customer care, and i don't mind re-grouting the floor (10m2) as the grout i used, technically was the wrong stuff. But i would rather find the solution to the problem rather than keep going back again and again

 

[DHTiling]

I agree, about finding why it has happened..

 

[Dontiler]

Sounds like really weak subfloor you had to start with, where it's cracking rake out joints and fill them with sbr bonding agent, let it dry for a day, then grout it with flexy grout, if that will not help, then you best bet is to lift 1 tile and see the problem yourself
good luck

 

[jonboythetiler]

cheers for that info, can you tell us a little more about this sbr bonding agent?? exactly how do i use it?

I'm going back there Friday morning to repair the grout.