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Unread 04-10-2013, 02:05 PM   #1
woodvette
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ditra with stone tile and heated floor

new to the forum so please excuse if this is a repeat question.
i am doing a new install bathroom. i used 9 1/4" i-joists with 3/4" t&g plywood for the subfloor. i ran floor heat wiring over this then pour the self leveling mortar to cover the wires. i started to install regular thickness ditra over this. i am going to use a natural stone tile (quartzite 16x16) for this floor. i just found out that i should have used a second layer of plywood subfloor of at least 3/8" thick. i need some advice of what to do at this point. i don't want to rip out the heat wire to install the second layer of plywood. that would waste $800 worth of the wire. will i be ok if i procede with the job? or is there something else i should do to strengthen the floor? schluter says my tiles may crack if i don't have the second layer of ply. thanks for any advice.
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Unread 04-10-2013, 02:14 PM   #2
cx
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Welcome, Ken.

You don't indicate your joist spacing, but natural stone requires a double layer of subflooring, each layer properly and differently installed, regardless the joist spacing.

Natural stone also requires half the design deflection as is required for ceramic tile. Unless your stone was in the plans prior to construction it's very unlikely your joists meet the necessary L/720 deflection requirement.

What you do with what you have is up to you, of course, but you are taking a substantial risk installing over what you describe.

My opinion; worth price charged.
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Unread 04-10-2013, 03:12 PM   #3
woodvette
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my joists are 16 o/c and have a 2 1/2" flange.
thanks
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Last edited by woodvette; 04-10-2013 at 03:15 PM. Reason: add more info
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Unread 04-10-2013, 03:30 PM   #4
Tenacious Billy
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Pay it now or pay it later.....I'd sooner dish out another $800.00 now and be confident in the installation.

I'm no expert, but chances are the fallout of an improper installation is likely going to cost you more than $800 in the long run.....
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Unread 04-10-2013, 03:33 PM   #5
woodvette
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what do you guys think of putting the extra plywood over the floor heat wire? i can see the wire enough to avoid screwing into it. just trying to think of all my options before i rip things apart.
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Unread 04-10-2013, 03:40 PM   #6
Tenacious Billy
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Heck no! Wood is a bad conductor for heat....plus, that floor will be up and down like a Bridesmaid's dress......rip it up.
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Unread 04-10-2013, 03:51 PM   #7
woodvette
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ok, one more idea. how about adding more self leveler to make that layer thicker. the heat wire is in about 3/8 - 1/2" of it already. thanks for all the help.
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Unread 04-10-2013, 04:04 PM   #8
Richard Tunison
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Were it my floor, I'd refer to post #4 and of course #2
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Unread 04-10-2013, 05:41 PM   #9
Soup2Nuts
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You can change your stone for porcelain and probably be ok.
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