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Old 02-05-2008, 04:31 PM   #1
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heated tile but over hardwood...


Hi all. Just wondering about installing radiant heating under ceramic tile (kitchen and small bath area). Problem is the floor is currently hardwood. Would it be best to remove the hardwood and tile over the subfloor? or is a backerboard necessary and also is it compatible with the radiant heat mats?

Thanks all,

CC

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Old 02-05-2008, 10:13 PM   #2
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heated tile but over hardwood...


Get rid of the hardwood.

Install the heat. Then bury it in Self Leveling Compound which would also serve as your tilebacker.

There is other criteria to consider but in a nutshell this is the easiest way to do it with the best assurance.

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Old 02-08-2008, 04:15 PM   #3
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heated tile but over hardwood...


Thanks Bud. Isn't it awful how the real answer is always the most difficult! lol. Someone is telling me that I need a min. 1/2" plywood subfloor for heated tile...is that true?
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Old 02-08-2008, 05:26 PM   #4
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heated tile but over hardwood...


Quote:
Someone is telling me that I need a min. 1/2" plywood subfloor for heated tile...is that true?
There are several things to be considered. My guess is that suggestion is if you intend to install tile over the hardwood and I'm hoping that isn't the case, it is very risky.

A sufficient floor structure is required for tile and the subfloor should be 1-1/8" thick before the tile, but yours isn't going to be that thick after the hardwood is removed. Some of that thickness would be/could be cement backerboard for the tile.

ANYWAY.........

What is the floor criteria now?

What size are the floor joists?
How far apart are the floor joists spaced?
What is the unsupported span of the floor joists?
What is the subfloor made of and how thick is it?

If they are talking about a 1/2" thick subfloor on the joists I doubt that is the case, that wouldn't meet any building codes for the past fifty years.
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