Flooring layers before installing tile

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Old 10-17-20, 09:35 AM
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Flooring layers before installing tile

Hi all

Question regarding flooring layers before installing tile.

I'm installing a heated tile floor in my kitchen. I've got a 5/8 plywood sub floor. In the past I've always laid a 1/4 inch of some kind of concrete board flooring product and then tiled on top of that. I'm trying not to raise the kitchen floor any more than I have to so it lines up closer to the adjacent floors.
I have two ways to do the heated floor either,

With cable guides strung across the floor then self leveling thinset then tile
Lay ditra or similar matt run the cable and tile over that.

With either of these methods or some other option would it be okay to skip the 1/4 addition to the subfloor or am I gonna be asking for cracked tiles in my future?

Thanks!
 
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Old 10-17-20, 09:49 AM
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Have you considered using the Ditra heat system ?
The heating cable goes right into the membrane.
Ditra Heat
 
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Old 10-17-20, 10:00 AM
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Sorry yes that what I meant when I referred to Ditra. I guess what I'm asking is will 5/8 plywood and ditra heat membrane be stiff enought to stop the tile from cracking?

Thanks!
 
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Old 10-17-20, 10:17 AM
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Your subfloor really needs another 1/2" plywood before the ditra heat.
 
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Old 10-18-20, 05:13 PM
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I don't agree with the 1/2 in addition at all. 5/8 ply plus 1/4 inch concrete fiber board has always stood up fine. Why would I need another 1/2 inch ply if using ditra?

If that was the case why would anyone even use ditra? It costs more and then your floor would be a solid inch higher than the subfloor. Thats a lot.
 
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Old 10-18-20, 05:22 PM
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You've told us nothing about your joist spacing or span, which leads me to believe your 5/8 subfloor is not adequate. And if its not tongue and groove I doubt it is. If you are using Ditra Heat consult their installation guide. I believe page 4 covers wood subfloors. https://images.homedepot-static.com/...a5fc7aee99.pdf
 
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Old 10-18-20, 08:32 PM
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Interesting thanks for the link. Maybe its a Canada or BC thing but I've never seen anything other than 16 inch joist spacing which is what I've got so I didn't even think to mention it....

From the looks of that link then yes with 16 inch I'm good to go with just the ditra.

Thanks

 
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