Cracking in Tile Grout

[Dave]

Morning..

If as you say the tiles are stuck solid and there is no tenting of the field tiles or any signs of debonding , then I would be looking at the water to powder ratio of the mixed grout.
If this was over watered , then this can produce a weaker product , thus can be the cause of the light cracking due to shrinkage of excess water evaporation , so,worth looking at that option as well.

The cracked tile , this could simply be a stress crack to an L cut , this can happen IMO and a replace as you say is simple enough.


Just another option to consider on the info you've provided.

Dave.

 

[Rich Midge]

I think Dave is spot on. Even if the grout was mixed correctly and to the letter the cracking you describe could be down to excess water when washing down. Really could be as simple as not squeezing enough water out of the sponges, be it washboys or by hand.

 

[J Sid]

Weber Grout mixed to wet or washed to soon or to much water...... Post #8.
Seen it may times on ufh, but what do I know...

Turn ufh off, remove grout and regrout.
Adhesive and grout should be mixed as manufacturers instructions, otherwise they will not perform at designed and your warranty will be void.

Heard it may times, 'been doing it 30 years, I know how to mix it' hopefully they mixed the adhesive correctly!
You now know it has not been mixed as instructed, ask them to redo it at there cost.
On the information you have supplied, weak grout look like the problem.