"SQLit" wrote in message
...

"Charlie" wrote in message
...
12 inch ceramic tile over a concrete slab in a 7 year home, yesterday
two
tile popped up and later during the day four more popped up, all
joining
each other. Tapping around the area I cleaned up it appears more will
be
pulling loose, Two of the tile broke during their popping. I don't see
any
hairline cracks in the foundation.I live in Central Ca. but we haven't
had
any earth quakes to contribute it to and neighbors haven't had the
problem.
Any ideas why before I try to get a pro out to look. I have a few extra
tile
just in case the problem doesn't extend further.
Thanks
Charlie

Was the concrete painted or covered with something before? Did you prep
the
concrete? A lot of people say you do not have to. I do and have never had
a
loose tile.

Did you use thinset?

I am the second owner and it was built by a local contractor so I'm not
famaliar with what was used, the slab does not appear to have been painted
and the mastic or what ever was used to apply the tile is a hard white
coating and I would say about half is stuck to the floor and the same to the
tile in patches. I don't know what thinset is.
Thanks