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Unread 03-18-2020, 09:05 AM   #31
mmoogie
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Quote:
Originally Posted by ss3964spd
We've merged your two threads, Steve, as they are for the same project. Helps all contributors to have the complete project history at hand when reading and responding to questions. Let is know if you'd like the thread renamed.
Thanks. Wasn't sure if I should keep them together or not. Title is fine.
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Unread 03-18-2020, 02:20 PM   #32
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FWIW, the overflow is not a vent. The vent is to prevent the trap from being siphoned out, and thus, needs to be after the p-trap. The overflow is attached prior to the p-trap. Otherwise, the overflow would have a direct path to the sewer gasses if it was after the p-trap.
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Unread 03-18-2020, 03:06 PM   #33
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To clarify, overflow does indeed allow air into tub drain but does not act as a plumbing vent to exterior. Plug it and see how well your tub drains. Big gulps of air through drain = slow drain. I probably shouldn't have mentioned as it just served to muddy the water.

I can imagine why code doesn't allow horizontal drains before traps, but it's typically from a worst case scenario point of view and not every case is that way. FWIW, I wouldn't do if for a client.
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Unread 03-30-2020, 02:29 PM   #34
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So I’ve bought warmwire and cablestrap for the dry area and suntouch showermat for the shower. Gonna bed the warmwire in SLC, which I’ve not used before. Any recommendations on brand? Is self-leveling underlayment the same thing? Local stores carry LevelQuick or Henry, MAPEI and Tec. Reviews are inconsistent.
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Unread 11-16-2020, 07:12 AM   #35
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bumping, and more questions

I'm back on this project. I used a bag of henry SLU for the shower. It worked OK, but still wondering if anyone has brand preference. Mapei is substantially cheaper and I need to do a larger area now. Anybody have any experience with the Mapei?
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Unread 02-22-2021, 10:30 AM   #36
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Bumping up.

I am still going around and around with Kerdi on the heating cables in the shower under 1x2 tile.

I bailed on the Suntouch mat because it didn't fit the space well. Then I got a longer spool of loose warmwire and planned to run that everywhere, including in the shower, loose with clips. I was just going to hot-glue the clips to the kerdi shower pan and then cover with another layer of Kerdi menbrane.

I called Kerdi for some guidance on dealing with the added depth from the heat cables and the drain install, and got into a discussion over what to do. They won't warranty loose cables, especially not THEIR cables.

The rep said that many people do the smaller tiles in the Ditra Heat mat, and they will warranty it on a special-exception basis if they OK the install beforehand, so I was going to do that to get the warranty, but they said still won't warranty it with other brands of cable. Now that I'm invested in 500 bucks worth of Suntouch warmwire cable, I guess I'm just going to have give up on Kerdi warranty.

My question is this: considering the 1x2 floor tiles would I be better off bedding the suntouch cable loose, or in the ditra heat mat? Warranty be damned, which would be the better install? Is there anything to worry about with loose cable being too hot right on top of the foam shower pane? The Kerdi repexpressed concern about that.
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Unread 02-22-2021, 11:01 AM   #37
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Quote:
Originally Posted by Steve
The Kerdi rep expressed concern about that.
That's about the only meaningful opinion you'll get for that application, Steve, other than your own. Is what is technically referred to as a KMAGYOYO situation.

I don't know that any of the radiant heating systems get hot enough to bother a styrofoam shower tray, but I don't use either, so I have no basis for an opinion. Another good reason to use a mortar bed rather than foam.

My opinion; worth price charged.
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Unread 02-22-2021, 11:10 AM   #38
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The heat of the cables directly on the foam could be an issue, Steve, and not sure how you could test it before hand, but I'm hard pressed to think they'd get hot enough.

But another potential issue that jumps right to mind is getting all those clips and loose cable fully embedded in mortar, with a smooth and uniform layer of mortar, without damaging the insulating jacket of the cable. You'd want a layer of mortar on top of the cable so shield it from the teeth of the trowel when you go to install the Kerdi.

Also, since you want to use such small tile I'd be concerned with point loads from the tile on top of the cable, pushing the cable down into the foam.
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Unread 02-25-2021, 07:09 AM   #39
mmoogie
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Quote:
You'd want a layer of mortar on top of the cable so shield it from the teeth of the trowel when you go to install the Kerdi.
That's definitely what I would do.

Quote:
a KMAGYOYO situation
I'm afraid so. Sigh.
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