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Unread 02-04-2020, 04:48 PM   #1
James_Pospischil
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Ditra heat

My first floor is a slab and we are considering installing ditra heat under tile in min living room area but not adjoining foyer. Can a heated are butt up to a unheated area? Same tile throughout. Thanks

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Unread 02-04-2020, 05:19 PM   #2
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Hi James, welcome.

Ditra Heat mat is 1/4" or 5/16", depending on which you choose. So if you installed Ditra Heat mat only in one area you'd have a 1/4" or 5/16" difference between the two areas.

Since you are working on a slab you cannot really install 1/4" cement backer board in the unheated area to make up the difference so you'd have to install the heat mat in all areas.

You'd have the same issue with any floor warming product.
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Unread 02-04-2020, 05:33 PM   #3
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Was planning on putting the Matt throughout. Main concern is cold butting up to heated area. I am a drywall contractor and have a fear of temperature differences and cracks. Lol. Thanks for your help

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Unread 02-04-2020, 05:49 PM   #4
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Won't be a problem, James.
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Unread 02-04-2020, 05:51 PM   #5
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Although it sounds like a valid concern, it is fairly common to not heat an entire room. Especially in bathrooms. We just went back to a bathroom last week we did two years ago that had in floor heat in part of it. There was no cracking. If your really concerned, you could put an expansion joint (ex: Schluter Dilex) for the grout line where is ends.
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Unread 02-04-2020, 06:10 PM   #6
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Thanks guys . I appreciate the feedback. Just crossing my ts before we make the commitment

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Unread 02-04-2020, 06:16 PM   #7
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You might consider the 5/16" version, James, less heat going into the slab.
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Unread 02-06-2020, 08:05 AM   #8
jadnashua
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As mentioned, Schuster makes a version of Ditra with a thicker fleece that acts as a thermal break that would be a good idea over your slab.
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Unread 03-20-2020, 04:36 PM   #9
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Ok moving forward after demo,grinding a d drywall install is now done. Any recommendations for thinset on concrete under ditra and should I use the same on top of mat/under tile? Thanks in advance, this forum is great.

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Unread 03-20-2020, 05:20 PM   #10
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Most thinset mortars get along well with concrete. Something like Versabond would fine. Be sure to get ALL of the dust from grinding off the concrete. Vacuum and wash at least.
One thing to consider since its a big area, is that you may want to go with 2 parallel heating wires vs. one long one (they may not make one to cover that area in the 120V wire), or going to a 240V service. Also, try to get the temperature sensor close to the center of the area, but out of where the sun will shine on it in the winter. Otherwise you’ll have where the sun hits warm and the rest of the floor icy under foot.
Mix the mortar a bit loose/soft (not runny) so it gets well embedded into the fibers on the back of the DitraHeat. Softer than you’d use for tile as you can’t really backbutter Ditra.
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Unread 03-20-2020, 05:22 PM   #11
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Along with many others here, I've used Versabond for both below and above the Ditra. If you're using a large format tile, Versabond LFT is available for bonding the tiles.
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Unread 03-20-2020, 05:49 PM   #12
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Quote:
Originally Posted by Gozo View Post
Most thinset mortars get along well with concrete. Something like Versabond would fine. Be sure to get ALL of the dust from grinding off the concrete. Vacuum and wash at least.

One thing to consider since its a big area, is that you may want to go with 2 parallel heating wires vs. one long one (they may not make one to cover that area in the 120V wire), or going to a 240V service. Also, try to get the temperature sensor close to the center of the area, but out of where the sun will shine on it in the winter. Otherwise you’ll have where the sun hits warm and the rest of the floor icy under foot.

Mix the mortar a bit loose/soft (not runny) so it gets well embedded into the fibers on the back of the DitraHeat. Softer than you’d use for tile as you can’t really backbutter Ditra.
Thanks for input. Have it wired for 240 . Will definitely wash floor down with water and sponge before install. Have vacuumed about 10 times already. Is it just regular unmodified versa?

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Unread 03-20-2020, 06:05 PM   #13
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Versabond is modified.
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Unread 03-20-2020, 06:10 PM   #14
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Unread 03-20-2020, 06:24 PM   #15
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