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Unread 05-26-2021, 11:49 PM   #1
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Outdoor concrete slab patio - laying tile advice

Hi, I just bought a house and wanted to remodel the patio flooring. I currently have concrete slabs with stamped overlay thats cracking and peeling.
There has been 3 expansions to the concrete deck. The original pour when the house was built. An expansion pour to expand the deck and an additional 4 slabs poured around the pool when the pool was added.
There are alot of expansion joints due to the additional concrete slabs that were poured for the expansions.
My question is, will I be able to put down ditra and tile over it? I have cracks on the stamped overlay so I do know that these slabs move a bit.
Will the ditra work in this case? I went to my local tile store and they told me I should just remove the concrete and do a new pour for the tiles. But If I am going to remove the concrete, I might as well just put down pavers.
any feedback would be much appreciated.
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Unread 05-27-2021, 07:58 AM   #2
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Hi Eli,

Post some pictures of your slab area. Sounds to me like you'll be removing the overlay.
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Unread 05-27-2021, 08:33 AM   #3
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Here are some photos of my patio pool deck

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Unread 05-27-2021, 02:12 PM   #4
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Ditra can allow cracks in the base to propagate up through the tile...it is not a crack isolation membrane.

Cracks, if the two edges are even, and one isn't higher than the other, a crack isolation membrane, depending on the width of the crack, might work with tile.

Then, you have to take into consideration is the product suitable for exterior use and potential freeze/thaw situations.

Getting the edges around the pool to be even without a lip could be tricky. With the curves, any tile application will be tricky and probably a candidate for a tile edge profile...probably stainless steel because of the pool chemicals, which will not be inexpensive.

Add your general location information to your profile so it shows up, and that might help with recommendations.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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Unread 05-27-2021, 07:22 PM   #5
Tool Guy - Kg
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This is a tough one. I don’t see how you could integrate all those joints that run every which way using uniformly-shaped tile and have it look good unless you were to honor the joints below by cutting the tiles to match those joints. Also, how would you deal with the tile-to-sloped coping interface? Stop the tile at the start of the coping and finish the tile edge with a stainless profile like Jim suggested?

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