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Old 11-04-2012, 08:29 PM   #1
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16x16 Travertine Install Tips

I'm installing 16x16 travertine on a 1500 sq ft floor. Subfloor is 3/4" tongue and groove OSB, with joists 2X8 16" on center. We would like to add radiant floor heating. I'm thinking Warm Wire.

Without the floor heating, I would add a layer of 1/2" plywood, then use Ditra XL for my underlayment.

However, with the Warm Wire, can I set the wire directly over my subfloor, add a 1/4 - 3/8" layer of leveling compound, then the Ditra XL? Or must I install that 1/2" plywood in addition to the leveling compound.

I'm not comfortable setting natural stone on such a large floor surface (over subfloor), let alone add radiant heating to the mix.

Any suggestions? Should I consider another source for the floor heat?
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Old 11-04-2012, 08:34 PM   #2
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Can't help you evaluate your joist system without you tell us the unsupported span, Dubs.

You must have a double layer of subflooring for natural stone tiles regardless the joist spacing. Your heating system may count as a tiling substrate, but not as part of the structure.

You'll need also to check with the SLC manufacturer for the minimum thickness required.

My opinion; worth price charged.
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Old 11-06-2012, 04:04 PM   #3
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16X16 Trav

The joist span is 19/2. The deflection rating is 619 at the lowest, all the way up to over 900.

What about the idea of setting 1/2" cement backer board directly over the subfloor, then use a high flex thinset for the tile install?

The caveat here is that half of the floor already has 1/4" cbu tacked down. If this wasn't the case, I'd add 3/8" ply over the subfloor, then resume with Ditra.

I am considering leaving the 1/4" cbu in place, adding another layer of 1/4", and then use 1/2" cbu throughout the rest of the floor to bring it up to level. With a good deflection rating, I assume the travertine install should be okay.
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Old 11-06-2012, 05:45 PM   #4
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Quote:
Originally Posted by Dubs
The joist span is 19/2. The deflection rating is 619 at the lowest, all the way up to over 900.
'Fraid I don't understand what you mean there. What is a span of "19/2" please.
Quote:
Originally Posted by CX
You must have a double layer of subflooring for natural stone tiles regardless the joist spacing.
Perhaps you missed that in my last post. Your CBU, like your proposed heating system, can be a tiling substrate, but adds nothing at all to the subfloor structure. You must still have a double layer of plywood or OSB under the tiling subatrate for natural stone tile.

My opinion; worth price charged.
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