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Grout cracking issue

8533 Views 22 Replies 11 Participants Last post by  The Coastal Craftsman
Ok guys i have a customer with a sun room and his floor has a little to much flex for my likeing and his grout has started to lift and crack. I didnt lay the tile or build the sun room but he wants me to fix it. Problem is he put the tile down. He used Ditra ontop of 3/8th's which is not enough sub floor in my mind and this is the cause of the issue. Other than taking up the hole floor and beefing up the subfloor if there another way to repair the grout. Maybe a more flexible grout??

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I see this all to often when the substrate is not prepared properly, you certainly have adopted an issue. There is no real solution except to tear it up, add another layer of plywood but, you may have elevation issues at the doors, removal of baseboard, shaving of doors and an eagle eyed client who is hating every minute of it as his wife is ripping him from a far.
Anti Fracture membrane has it's limitations as well, it looks like a fairly large tile in the photos 12"x24" or 16"x24" the previous post is correct the tile is next on the list for failure. If there is a lot of flex as you have stated BC in the floor there is not a lot to do here or easy solutions.
Contact Mapei they as long as you follow the wriiten specifications they provide and use their products, they will warranty the install for ya, I am pretty sure Laticrete will do the same.
But, Like anything else in life no foundation...... no future.
Regards GTG
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