Grout cracking at tile edge - TilersForums.com

[Pierluc]

Hey there, i just finished the tiles in my house and i am having this problem in a couple places. this is the section that my grout was a little too wet but i used it anyway could it be the problem ?

i used Chembond adhesive and mapei ultracolor plus grout, sub floor is 3/4 inch OSB 3/8 ply, screw at 3 inches square, 3/8 thick tiles, 3/16 spacing

there is no movement on the floor, im really wondering if too wet grout and not pushing it in enough is the problem. this is the only section where i failed the mix the other parts are fine

thx for the help

 

[kilty55]

hi when you say tile edge do you mean the edge of the room where the tile meets the wall?

 

[Pierluc]

between tiles laid on the floor, it seems like the grout did not stick to the side of the tiles at some place, as if it would have shrink

 

[doug boardley]

with mapei ultracolour, you have to follow the instructions to the letter, it's a formidable grout when mixed properly. I think it probably is the reason, although your ply should also have been at least 1/2 inch.

 

[diamondtiling]

As Doug has stated, the ply is far too thin, lateral movement?

 

[boxer1van]

What spacer size used, too narrow or poss too wide?

 

[david campbell]

What spacer size used, too narrow or poss too wide?

wouldn't matter,the main thing here are the ply is too thin!

 

[Pierluc]

3/8 ply is all we use in Quebec and i never had problem this way, but yes maybe i could have taken thicker one :smilewinkgrin: theres another 1/8 sheet between my 3/4 and the 3/8, the stuff they use to put linoleum on, should i have remove this piece ?

 

[DHTiling]

Have you done a deflecto test on the joists....

Your sub-base should be fine.... what Standard is the thinset..? is is modified in anyway.

 

[DHTiling]

You can do a joist deflecto test here>>>> The Amazing John Bridge Forums Deflect-O-Lator