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Unread 01-30-2008, 04:34 PM   #1
Loren L
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plumber installed drain not level - huge problem?

The plumber installed new drain lines in trenches in the basement floor for a new bathroom. They did lots of replumbing down there and did a really good job. BUT when the trenches were filled and the slab repaired, the shower drain (clamping flange) turns out not to be perfectly level. It's tilted so that it's about 1/4" - 5/16" higher on one side than the other.

Assuming that the next steps are the preslope, membrane, clamp top piece of drain, and final mud slope (sorry, this can't be a Kerdi deal at this point), am I in big trouble with the 1/4" "tilt" of the drain? Can this be made up with shims between the membrane and top flange (or on top of the bottom flange under the membrane)? I would think that this kind of thing would be done all the time, but what do I know.

Or do I have to hassle with the plumber and have the floor hammered out again? If so, what's an acceptable amount of off-level to accept?

Many thanks.

-Loren
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Unread 01-30-2008, 05:00 PM   #2
ceramictec
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looks like you need to have the plumber or the concrete guy chip it out and level it up.
I run into that a lot down here since we are 99% on slabs.
what happens is the concrete guys always hit the pipes making the tilted.
get on one of them to fix it.

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Unread 01-30-2008, 05:12 PM   #3
Mike2
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Loren, a 1/4" to 5/16" tilt across the flange is quite a bit. Any attempt to straighten that out with shims could easily compromise the seal between the liner and the lower portion of the clamping drain.

How about this. Temporarily secure the upper portion of the flange in place, screw in the upper drain body and measure the tilt across the screen on top. That's the difference you'll see when grouted. Is that acceptable to you?

All that could be corrected by chipping out some of the concrete around the riser coming up from the p-trap, cutting the pipe and reconnecting it using a flexible rubber color (Fernco fitting). Then patching up the hole. That would not be a major repair for most plumbers.
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Unread 01-30-2008, 05:26 PM   #4
ceramictec
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some plumbers just chip out the high side and wedge down on the low side to correct it, then cement it back.
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Unread 01-30-2008, 05:48 PM   #5
muskymike
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Hi Loren, definitely gotta straighten it.
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Unread 01-30-2008, 09:30 PM   #6
Loren L
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Ok . . .

Thanks, guys. That's not the news I wanted to hear, but now I know what I have to do. Gotta get the hammer and chisel out.

-Loren
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Unread 01-30-2008, 09:55 PM   #7
framer
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busting up concrete is a bitch. you could maybe shim the drain cover on one side. after you have the pan/bed done, unscrew the metal cover on top, and shim it up on the low side.
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