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Unread 12-19-2010, 07:29 AM   #1
FGH
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Toilet flange / Kerdi Drain advice

Hi Folks

I've got a dillema. My basement bathroom floor is tile over Ditra, over concrete with infloor radiant heat. Problem is the toilet flange is not installed and I tiled right up to the toilet drain pipe (rough-in sticks up about a foot).

I have been all over the internet on how to install the flange and most say it should have been installed before tiling so the flange will be flush with the finished floor.

Also, the flange I have is the type that gets cemented inside the waste pipe. However, there is no way I can drill into the concrete floor to secure it because I have no idea of where the infloor tubing runs.

I need some serious direction and advice on how to install the flange, and would appreciate advice on how installing the last piece of the Kerdi drain (part with the square drain cover) Does it get cemented in with PVC cement or just placed flush with surrounding tile with thinset?

Thanks in advance - really need some solid advice here.

Frank
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Unread 12-19-2010, 08:17 AM   #2
Davy
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Frank, the toilet drain should sit down on the tile, not be flush with the tile.

Check this out about your Kerdi drain question. http://www.johnbridge.com/vbulletin/...ad.php?t=28637
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Unread 12-19-2010, 08:56 AM   #3
Levi the Tile Guy
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Frank,

Like Dave said with the flange you are fine. If you don't want to drill a hole through tile and into slab, I guess you could use some glue and glue it down. I would be very supprised if drilling a few anchor bolts would penetrate into your plumbing though. You generally have a little bit of vertical drop in your plumbing before it makes the turn and heads to the sewer line.
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Unread 12-19-2010, 08:59 AM   #4
cx
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Welcome, Frank.

What Davy said.
Quote:
Originally Posted by Frank
I have been all over the internet on how to install the flange and most say it should have been installed before tiling so the flange will be flush with the finished floor.
You're apparently missing any of the serious plumbing sites. Everyone on those should know better.

You really think your hydronic heating tubes were run that close to the WC drain riser? That would be pretty unusual and rather incorrect, too. There should be plenty of room for you to install your toilet flange fasteners, which you'd really want with that plastic flange.

My opinion; worth price charged.
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Unread 12-19-2010, 09:05 AM   #5
FGH
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Levi:

I'm not too concerned about drilling & hitting the drain pipe. What I am concerned about is hitting the radiant tubeing in my basement slab. I don't know how deep the tubing is or how close it is to the toilet drain pipe. In finishing the basement, nothing was drilled into the concrete slab.

Frank
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Unread 12-19-2010, 10:14 AM   #6
bbcamp
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Turn up the heat and feel the floor near the toilet. It will be warm where the tubing is, and cold(er) where it is not. Such tubing isn't usually installed within the footprint of the toilet to avoid overheating the wax ring.
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Unread 12-19-2010, 10:40 AM   #7
Houston Remodeler
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Get yerself one of those terlit flanges that;

1- slides right into the riser pipe, secured with normal PVC glue
2- has a stainless steel ring where the terlit bolts go.
3- move onto the rest of the floor

Install the ring after you set your tile. It will be perfectly flush at the height you need it to be.

like this

or this
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