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Old 12-07-2009, 11:55 AM   #1
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Tile on concrete floor with radiant heat


We are going to lay tile on concrete floors with radiant heat already poured in to the concrete, (1200 squ ft total) the slab is 4 mos old with a concrete block frost wall around it (in MT) there doesn't seem to be a consensus on how to do it, we are considering porcelain and/or ceramic 13x13 or 16x16 so what is everyones opinion on underlayment, flexible mortar, or just regular thin set, we don't have any cracks yet and have scribed expansion joints where there is going to be carpet HELP PLEASE Thank you Jen

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Old 12-07-2009, 05:06 PM   #2
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Tile on concrete floor with radiant heat


Ditra.

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Old 12-07-2009, 06:05 PM   #3
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Tile on concrete floor with radiant heat


Technically nothing is required. You can use thinset and go for it. Truthfully, you should protect yourself by using an isolation membrane. DITRA is a good one and Noble company also offers good crack isolation membranes. Radiant heat buried in the floor will guarantee the floor will move around seasonally.

You should also build some expansion joints into the tile installation on a job that big.

If all you did was "scribe" marks in the concrete, those ARE NOT "expansion joints". Those are merely "control joints" installed in an effort to control the eventual location and direction of any cracks that may develop.
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Old 12-08-2009, 02:19 PM   #4
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Tile on concrete floor with radiant heat


Keep it civil & stick to the question at hand
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Old 12-09-2009, 11:22 AM   #5
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Tile on concrete floor with radiant heat


Thanks, where do you buy either type? Do I need it in the smaller bathroom area also? Thanks again
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