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Unread 05-05-2011, 06:45 PM   #1
TightLines
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heated floor method opinions

howdy folks,

have been lurking/learning here for a while and wanted to bounce an idea off the resident tile wizards...... installing my first flexthem heated floor system and it gauges out thicker than the usual mats (its a wire and bracket system that you run to fit your space rather than pre-made mats)...... the field tile is an 18 inch rectified edge porcelain with 1/8" joints so I have little or no room for error in the flat and level plane..... my proposed method for installing is as follows->

-thinset and nail hardibacker in areas where heated wire will not go (i.e. vanity, under toilet)
- install heated floor wire
-use laticrete 209 to mud over heated floor wire, screeding off installed backerboard
-ditra over entire area
-install tile

opinions?.... criticisms?

THANKS FOR YOUR TIME!
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Unread 05-06-2011, 12:12 AM   #2
silvercitytile
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hydronic heat Joe?
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Unread 05-06-2011, 12:21 AM   #3
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never mind u mean wire lol. sounds good to me

remember 3" spacing with wires. dont over lap lol. and hold them wires down. dont put wire near wax ring for shiters.



and dont over order the wire u need. if u you do have extra ft of wire,run the wire routered into the cement board and tape and thin set over.
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Unread 05-06-2011, 07:38 AM   #4
TileArt1
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You're going to screed off of the installed backerboard so that essentially gives you a 1/2" mud bed? I wouldn't trust that. Minimum thickness is 3/4" and some feel even that is too thin.

You would probably be better off using slc between those sheets of backer over your wire. I don't think I would trust a 1/2" mud bed below that floor.
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Unread 05-07-2011, 04:55 PM   #5
pgc555
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Looks like your installing over OSB ? Check your thin-set OR SLU manufacture's
advice on that. In one picture (with tile) Is that your new floor or what your matching up to?
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Unread 05-07-2011, 05:51 PM   #6
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hey Phil those are my pics sorry for the confusion. tile is on hardi backer in the small bath room rest of the floor is a laminate floating floor.
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Unread 05-08-2011, 05:52 AM   #7
pgc555
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Got it Jeff,
I didn't read the first post well enough. I see it now. I agree with TileArt , the LATICRETE 209 is mudd. SLU OR medium bed ( 4-XLT ) to back trowel and cover the wire. Some guys do 2 sometimes 3 coats to cover the wire to get the plane flat before the DITRA. Adds to your time, waiting for drying time between coats but now days, who is so busy they can't wait a little?
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Unread 05-08-2011, 05:58 AM   #8
tilejoe
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I've done the heat similarly, but started with 1/4 cbu on the floor and an additional layer of 1/4 on the areas that the wire does not go, like the perimeter and toilet area for example. Run the cable and screed thinset over the area, using the cbu at the perimeter for my screed.

I'm sure your supposed to use a medium bed, but I never did. It's pretty flat, but not perfect
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Unread 05-08-2011, 10:10 AM   #9
TightLines
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thanks for the feedback, the only reason I was using floor mud was because i am more comfortable with the product than SLC (last time I used leveler the stuff was kicking off as I was trying to screed it) and the heated wire on this job is in such a small area (a 3'x8' strip in an 80 foot bath) where the backer surrounds the mortar bed and the whole thing is locked in by the ditra, but lesson learned..... I have used the 209 in a handicapped shower remodel years ago where the drain was at 1/4 inch height and haven't been called back on it, but now you guys have got me scared..... either way I appreciate all the feedback!
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Unread 05-08-2011, 12:45 PM   #10
Rock Solid
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We prefer Nu-Heat mats but 95% of the time customers do not want to pay the extra cost over Sun Touch wire or similar systems. And we never use slc because it is a ripoff.

The typical heated floor we do is as follows.

1. Electrician installs heat wire to plywood subfloor.

2. We hot glue down any loose wires and flash thinset over the tops of the wire, using an appropriate sized notch trowel to fill the non heated areas.

3. The next day after drying we apply ditra over the previously flashed thinset.

4. Flash in ditra.

5. Install tile or stone flooring.
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