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Old 02-07-2012, 10:39 PM   #1
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Ditra with partial heat


Hello,

I have searched but didn't find the answer to my question. I will be tiling our dining area and kitchen but only plan on putting radiant heat in the kitchen. How do I compensate for the added height of the wire/mat heating in the kitchen? I plan on using Ditra. The subfloor is plywood and the tiles are 16x16 porcelain. Thank you.

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Old 02-08-2012, 07:15 AM   #2
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Ditra with partial heat


There is very little extra height due to the wires, they are typically about 1/8 inch or so, and they are covered in thinset or SLC anyway.

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Old 02-08-2012, 08:02 PM   #3
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Ditra with partial heat


Well...yea, that's the answer. The entire floor gets covered with self leveling cement to make the floor flat. Although the wires are about 1/8", that is way too thick to just go over them. What do the directions tell you to do?

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Old 02-09-2012, 10:36 AM   #4
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Ditra with partial heat


Sorry, didn't give enough information. Will use SLC in kitchen that is about 150sq ft but didn't plan on using SLC in the 250sq ft dining area. This is because it seems to be flat enough and I didn't want to spend money if not needed.

I talked to Schluter and they recommended putting unmodified thin set on the SLC (under the Ditra) and modified on the plywood in the dining area. To make up for the "lower" area that doesn't have SLC, they recommended increasing the amount of unmodified thin set between the tile and Ditra.
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Old 02-09-2012, 02:11 PM   #5
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Ditra with partial heat


Quote:
I talked to Schluter and they recommended putting unmodified thin set on the SLC (under the Ditra) and modified on the plywood in the dining area.
Well yes, you have to use the "substrate-appropriate" thin set regardless.

Quote:
To make up for the "lower" area that doesn't have SLC, they recommended increasing the amount of unmodified thin set between the tile and Ditra.
WOW, they actually said that? I hope that is not exactly what they meant.

How do you build up an extra 1/8 - 3/16" with thin set? I don't know what they said or what the person meant, but that advice is definitely wrong.

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Old 02-09-2012, 07:46 PM   #6
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Ditra with partial heat


Thanks Jaz. That is what I was told but I am going to take your advice and pick up more SLC tomorrow so I can cover the whole tiled area.
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Old 02-09-2012, 08:28 PM   #7
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Ditra with partial heat


Maybe he/she meant to apply a little more thin set on the backs of the tiles just in the transition area? Make a slight ramp? In any case that is a tile installation technique and is out of their expertise.

It's best to start with a flat floor. Have you ever used SLC? Don't forget the primer.

Jaz
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Old 02-09-2012, 08:54 PM   #8
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Ditra with partial heat


I have very little experience with SLC but do know I will need to prime first.

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