Hi, I'm installing travertine tile over my existing concrete. It will
go in the backyard where there is a pool. The concrete is pretty old,
maybe as old as 30 years since the house is that old. The concrete
looks very good. The cracks are very fine and every contractor that
has come by said tiling over is ok. Between the slabs there are
aluminum spacers. There are also many drains in the deck which results
in each slab being sloped inward. So where the slabs meet there is
kind of an inverted vee. My mason is concerned about over the years
the slabs shifting and the stress causing the tiles to break. He wants
to put a cut over the aluminum spacers so that if the slabs move the
tiles will not crack. Is this overkill? It would obviously look a lot
better without those cuts and I think that any slab shift would be
done by now.
On a related note, since I'm not removing the existing concrete, the
tiles will be higher by about an inch on the house. They will now abut
the house near the lower wood edge of the sliding door. Will this
cause problems with trapped moisture?
Thanks for your help.
No, it is smart. Partt of the reason why your slab still looks good after
all these years is that the original mason understood that you have to
account for movement. It's not very much, but concrete and stone will not
No, things often move seasonally as well as long term settling. You could
make good solid marks on the slab on either side of the joint, and then
take accurate measurements several times a day on many days throughout the
year to determine if there's any movement, where even a couple thousandths
of an inch would be enough to send a crack through your stone....
But I simply wouldn't take the risk: IMHO, the thing about stonework that
really looks best is knowing that it's going to last and last.
Yes, you quite likely will. Given that your mason seems to know his
stuff, I'd ask him to make a reccomendation, you're likely going to have
to reflash at a minimum.
Remove the dead poet to e-mail, tho CC'd posts are unwelcome.
Ask me about joining the NRA.
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