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Old 03-11-2014, 12:07 AM   #1
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small mosaic floor tile


HI I recently tile my floor with 12x12 tiles made of octagon and diamond shapes. I let it set for 24 hours before I walked on it. I've noticed that the smaller diamond shaped pieces pop and crack and are loose under foot?

I haven't grouted yet but am wondering what to do. I was generous with my thinset coverage but it seems that some of the smaller pieces may not have a strong bond. I am including a pic. Thanks

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Old 03-11-2014, 06:34 PM   #2
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Well yeah, if they're loose there is not a strong bond, you're right. If you used the right trowel and procedure what went wrong could be that you didn't beat the tiles down with a grout float.

Closely inspect and remove all the loose pieces and set them individually.

Jaz

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Old 03-11-2014, 07:32 PM   #3
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I don't know I used a section of 2x6 to press down on them. The thinset is a brand new bag. What if I used a really strong fortified grout, would that help to hold them in place?
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Old 03-11-2014, 07:54 PM   #4
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What do you mean by "really strong fortified grout"? Grout fills the gaps.

A 2x6 is not the right tool to use, it's not cushioned, it won't bend with the floor.

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Old 03-11-2014, 08:09 PM   #5
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I thought maybe the grout would help hold it in place. If not guess I have to rip it out or take my chance. That's a bummer cus I've done tile jobs before and never had this problem.
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Old 03-11-2014, 09:09 PM   #6
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Another reason we charge more for mosaics.

Take a utility knife to cut the netting lift the tiles. Apply a small dot of thin set and set.

Just for info, which thin set did you use and over what?

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Old 03-11-2014, 10:16 PM   #7
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scratch coat mortar over 3/8 plywood.
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Old 03-11-2014, 10:34 PM   #8
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every tile i pull up all the mortar is on the floor and very little bondin to the tile? Are these types of mesh bacj tiles prone to this? I've nevr had this problem before?
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Old 03-11-2014, 11:09 PM   #9
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Wrong mortar and never should have been installed over just plywood.
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Old 03-11-2014, 11:30 PM   #10
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Scratch coat over ply? Yikes. What's under the 3/8" ply?

Where are you, Canada or East Coast?

Jaz

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