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Old 08-16-2011, 12:42 PM   #1
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Loose tile on lightweight concrete subfloor. Help!


Hi Folks,

My friend (a pro tiler) recently installed porcelain tiles in my 9x11 galley kitchen. His father who owns the business mentioned that the lightweight concrete (possibly gypcrete?) subfloor could pose a problem. My friend decided since the original laminate was installed on the subfloor, the tiles could just go over it. Since he was the pro, I thought nothing of trusting him with his opinion.

Flash forward a few weeks later, and grout has been cracking and chipping. Now two tiles are noticeably loose when walked on. I have done a bunch of research, but am not really sure how to proceed. What makes it especially hard is the installer is my friend. Any thoughts on how to proceed with fixing this mess?

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Old 08-16-2011, 01:32 PM   #2
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Loose tile on lightweight concrete subfloor. Help!


Hi and welcome to the forum.

If he's truly your friend, ask him to come back and look.
Perhaps his estimate on the strength was off?

DM

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Old 08-16-2011, 01:32 PM   #3
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Loose tile on lightweight concrete subfloor. Help!


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Originally Posted by bassgod1 View Post
Hi Folks,

. My friend decided since the original laminate was installed on the subfloor, the tiles could just go over it.
I assume you mean linoleum. At this point, you will probably have to remove it all including the linoleum or vinyl. It probably wasn't adhered to the floor in some places. How did your friend install the tile?
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Old 08-16-2011, 01:48 PM   #4
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Loose tile on lightweight concrete subfloor. Help!


Thanks so much for the welcome, DangerMouse.

Sorry Rusty! Totally meant linoleum. There was a cheap peel 'n stick tile above the original linoleum. He took that out and determined removing the linoleum from the LWC subfloor could cause a lot of damage. He used a mapei thinset mortar and placed the porcelain tiles (13x13) straight onto the linoleum. His thinking was the linoleum flooring would prevent shifting. It was also his thinking that using a ditra underlayment wouldn't really help in this scenario. Would removing the installed tile irreparably damage the subfloor?
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