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Old 03-24-2009, 10:05 AM   #1
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Radiant floor heat


Will be installing radiant floor heat mat under tile in my bath in the next couple weeks.
Question is, when I apply the thin set over it, do I have to just build up the thin set thicker where there is no mat or heating element? To keep a level look. Like where my vanity, toliet will be. I'm guessing the answer is yes, but thought I would ask.
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Old 03-25-2009, 06:14 PM   #2
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Radiant floor heat


For ease of tile installation, you could just use some self leveling compound over the element.

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Old 03-25-2009, 08:37 PM   #3
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Radiant floor heat


Self leveling being a thin mix that levels itself out?
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Old 03-25-2009, 09:09 PM   #4
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Radiant floor heat


Self levelling works well. We just installed a large electric mat under stone tile, however the mat is so thin (about 1/8 inch) that there was only a very minor issue with leveling with ordinary thinset, so we did not bother with any self leveling compound. We installed Ditramat over the mat using modified thinset, then the stone over the Ditramat using unmodified thinset (manufacturer's recommendations). The whole process was pretty straightforward. Just make sure you have a digital ohmmeter to check the wire for damage, typically the manufacturer will give you the resistance when the wire leaves the factory, and you check it to make sure you did not nick or damage the wire during the install.
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Old 03-25-2009, 09:10 PM   #5
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Radiant floor heat


I just used the thinset to build up the area near the toilet etc
Worked fine
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Old 03-28-2009, 07:20 AM   #6
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Radiant floor heat


I guess leveling is an option. No problem with cracking, etc.? Seems a little worrysome have a thin layer of leveler, heating element, then thinset and tile on top.
You have used this method with good results?
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Old 03-28-2009, 08:48 AM   #7
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Radiant floor heat


You misunderstand. You prime the floor, attach the element and then pour self leveler over the element instead of using thinset. Much easier most of the time. It'll leave you with a smooth cementious floor to thinset tile to.

Is the subfloor wood or concrete?

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Old 03-30-2009, 09:36 AM   #8
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Radiant floor heat


Will be wonderboard on top of wood subfloor.

So wonderboard, heating element, floor leveler, thinset, tile.
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Old 03-30-2009, 12:59 PM   #9
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Radiant floor heat


Been reading more on Ditra. Haven't laid tile for a number of years and this looks like good stuff! Lot easier than Wonderboard.

As stated before from Daniel, it goes Heating mat, modified thinset over it, Ditra, un-modified thinset, then my tile?

Sounds too easy now not dealing with Wonderboard.
Is it?

I guess it can be found at Home Depot/Lowes?

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Old 03-30-2009, 01:03 PM   #10
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Radiant floor heat


Ditra does have some R value to it. So expect a little longer heat up/reheat times. If there will be any areas that already have radiant under them, there will be a timed difference that you can feel.
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Old 03-30-2009, 01:10 PM   #11
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One other thing I just thought of, I was going to use Wonderboard right over the linolium floor, but if I go to Ditra, will I have to get down to the plywood subfloor? Can the radiant heat mat go on top of the linolium then covered with thinset, Ditra, tile? I would think not, but.....
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Old 03-30-2009, 01:20 PM   #12
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Sure! As long as the element is fully embedded in mortar, thinset or SLC it's no problem.
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Old 03-30-2009, 05:03 PM   #13
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REMOVE the vinyl.
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Old 03-30-2009, 05:30 PM   #14
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...and use SLC.
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Old 03-31-2009, 07:50 AM   #15
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Radiant floor heat


Ok
No biggie to remove the vinyl.
So it goes:

Attach my heating element material to subfloor.
Apply SLC.
Apply Modified Thinset.
Apply Ditra.
Appy Un-modified Thinset.
Apply Tile.

Sound correct?

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