holes and cracks in grout about 48 hours after being layed.

[James Spelrem]

There are two possibe reasons for this to happen the one you hope for is shinkage of the grought caused by too much water in the mix. the other is movement in the floor caused by substraight how big are the tile what notched trowel did you use mortar or polymere mortor what did you put it over

 

[marcie]

Thanks everyone for your help. The tiles are 12 inches. I am not sure what size of trowel he used or the morter.
Since he has done the other tile in the house I know he was careful. I deciced to buy this type of grout because the other place was closed.

I hate to see him redo the whole bathroom. What is the risk of raking out the grout where it is cracked and filling only those areas? Or am I asking for problems down the road.

I am located in the U.S.

 

[cornish_crofter]

OK so it's a premixed grout.

Thinking laterally:

1) The grout may have been wiped off using too much water. Even with premixed, you can over water. Excess water will displace some of the grout.

2) More likely IMO, the grout may not have been applied with enough pressure. You need to make sure the grout lines are filled with grout. It's easy to wipe over the tiles with a squeegie without actually filling the grout lines, I've done it myself.

Premixed grouts tend not to be used by the regulars here. The reason is that as well as being expensive they don't give consistent results. I used to use premixed on wall tiles but always had to go over the area twice, as the first application gave the appearance of a crack in the grout running down the middle of the grout line. I suspect this was actually shrinkage whilst drying. This could be another problem you have.

 

[marcie]

Thanks for your input. The man that put the tile down mentioned shrinking.

Marcie

 

[James Spelrem]

if the grought is soft where you can scratch it out with your finger nail it is the grought my real concern is what did the tile go over plywood over 5/8. osb 7/8 substaight is code for alberta. Did he use something else like partical board did he go over exsisting if he did what was there? is this on wood or concrete.there is no real way to identefy the problem without more information.My fear is you have movement in your your floor a solid sub straight is critical in any tile installation movement cannot exceed 2% without a tilematting like detramat by scluter even then 5% is pushing it.

 

[Alberta Stone]

typical Alberta floor is 3/4 main deck with minimum 3/8 subfloor over that.
1/2 is better.
So you get 1 & 1/8 overall thickness, which is according to code.

 

[jag000]

any chance you are grouting tiles that have UFH underneath? if so then the grout could crack if it isnt flexible, but i could be wrong

 

[Colour Republic]

This would be the product then ?
Mapei Premixed Grout review by goodmand, consumer reports & videos

:ban:I may have just lost the will to live after watching that review

 

[White Room]

Would you buy this product off this man:yikes:

 

[Alberta Stone]

Originally Posted by Sir Ramic

This would be the product then ?
Mapei Premixed Grout review by goodmand, consumer reports & videos

UGH😛rrr:

Not a good review.

Now here is a good salesman:
slapchopcommercial - Google Videos