Radiant Heat Under Ceramic Tile - Flooring - Contractor Talk

Radiant Heat Under Ceramic Tile

 
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Old 11-26-2013, 01:25 AM   #1
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Radiant Heat Under Ceramic Tile


we have done several heated floors under ceramic tile using the mats and have had fairly good luck with keeping the tiles plumb.
We use a 1/2" trowel where there is no mat and use a 3/8" trowel over the mat.
the last bathroom we did, we used a cable system... IT WAS AWFUL!!!! not only did the guy sell us WAY to much cable we had no idea what we were doing. We installed the cable 4 times before we got the proper lay out. We had 2 rolls of cable 1 did 60sqft the other did 70sqft (its a pretty big bathroom). We tried the 60sqft roll twice before we realized it wasn't enough, and then used the 70sqft roll and eventually made it work. We could have used both rolls but its not recommended to install it under tubs and cabinets.
After the cables were installed we used floor leveler to cover the cables and a small area surrounding the cables. when we went to lay the 18x18 tile it was a nightmare to get the tiles level with one another.
is there a better way to level the tiles? should we have just used a ton of floor leveler on the whole floor?
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Old 11-26-2013, 01:38 AM   #2
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Re: Radiant Heat Under Ceramic Tile


The tile guy I talk to says he uses Easy Mat for bathroom tiled floor heating, along with Fusion Pro grout. Remember, don't use a wax seal on the toilet.

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Old 11-26-2013, 09:07 AM   #3
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Re: Radiant Heat Under Ceramic Tile


I've used both mat systems and loose lay cable systems and I prefer the latter.

That said, it is more of a PITA from a labor perspective. The manufacturer should have provided a spacing guide based on the square footage you were covering, and the length of cable--but I know it still takes a little thought and sometimes t&e to get it just right.

In answer to your last question--yes, you'll get a much better result by leveling the entire floor to the depth of the cable. Once the cable is installed, we run screws throughout the room around 2' o.c.--leaving them up at the height we want the top of the leveler pour.

With an uneven floor, a cable system kills two birds with one stone. Even coverage throughout the space, and a perfectly level floor.

Hope that helps.
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Old 11-26-2013, 10:08 AM   #4
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Re: Radiant Heat Under Ceramic Tile


With a loose cable system you have to start in the center of run then lace both directions. The center of run may not be the center of the room.

SLC on the entire floor. I mix mine in a plastic tote, usually 3 bags at a time. The fewer times you have to mix the better.

I do use wax rings on the toilet, just keep the cable 6" from the flange.

Tom
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Old 11-26-2013, 11:31 AM   #5
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Re: Radiant Heat Under Ceramic Tile


What cable system do you use?
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Old 11-26-2013, 12:36 PM   #6
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Re: Radiant Heat Under Ceramic Tile


http://www.suntouch.com/warmwire/

I also use their mats. Their products are rated for wet environments, I use them in showers.

Tom
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Old 11-26-2013, 01:10 PM   #7
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Re: Radiant Heat Under Ceramic Tile


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Originally Posted by tjbnwi View Post
[url]... I use them in showers.
Tom
I'm going to try to start working that into pied-a-terre/bachelor pad remodels. High-rise condos are all about those touches.

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Old 11-26-2013, 01:14 PM   #8
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Re: Radiant Heat Under Ceramic Tile


Next you'll be doing heated mirrors in the shower niches…..

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Old 11-26-2013, 01:37 PM   #9
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Re: Radiant Heat Under Ceramic Tile


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Next you'll be doing heated mirrors in the shower niches…..

Tom
Keep going; I'm writing these down.
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Old 11-26-2013, 02:00 PM   #10
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Re: Radiant Heat Under Ceramic Tile


Both these mirrors have the hot water line that supplies the shower mixing valve sandwiched between (but not touching, that would be bad) 2 aluminum plates running behind them. Both are 4 runs on the bottom ⅓. I did pad out the wall ¾" so the shelf would be deep enough. Next one I'll take progress pictures.

Also found a picture of the SunTouch mat on the shower floor. The dark is plastic lath, the rest of the area will get the same.

Tom
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Old 11-26-2013, 09:29 PM   #11
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Re: Radiant Heat Under Ceramic Tile


Laticrete NXT level
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Old 11-26-2013, 09:52 PM   #12
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Re: Radiant Heat Under Ceramic Tile


Lacitcrete does not require primer and lath over wood?

I use Mapie, they require primer and lath. They manufacture a plastic lath for use with electric heat.

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Old 11-26-2013, 09:55 PM   #13
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Re: Radiant Heat Under Ceramic Tile


Primer yes, no lathe required
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Old 11-26-2013, 10:03 PM   #14
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Re: Radiant Heat Under Ceramic Tile


Okay, I find that interesting as the wood and cement product move at different rates.

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Old 11-26-2013, 10:06 PM   #15
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Re: Radiant Heat Under Ceramic Tile


I'll have to reread the specs. I went with my suppliers suggestion, and he hasn't steered me wrong yet.
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Old 11-28-2013, 06:56 AM   #16
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Re: Radiant Heat Under Ceramic Tile


I'm starting a heated floor shower also that will have heat in the shower area also... pictures to come. Wish me Luck, it might be SHOCKING experience..
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Old 11-28-2013, 07:31 AM   #17
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Re: Radiant Heat Under Ceramic Tile


I read the nxt specs and a lathe is required over plywood.
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Old 11-28-2013, 07:37 AM   #18
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Re: Radiant Heat Under Ceramic Tile


Good!! You can read. You get a good boy star for that..

Haha !
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Old 11-28-2013, 07:47 AM   #19
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Re: Radiant Heat Under Ceramic Tile


I've had the best luck with the loose wire systems. Can't remember the brand. I don't do many, but when I do, I use a hot glue gun to glue the wires down. It comes with sticky holders that are spaced evenly, but I always want the wires fastened between the holders. Then we pour leveler over the entire floor. Works great. Gives me a perfect base for the new tile and covers the wires.
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Old 11-28-2013, 08:05 AM   #20
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Re: Radiant Heat Under Ceramic Tile


Quote:
Originally Posted by Floormasta78 View Post
I'm starting a heated floor shower also that will have heat in the shower area also... pictures to come. Wish me Luck, it might be SHOCKING experience..
That's why I went to the SunTouch system. Their system is UL listed for in shower use.

Tom

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