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Linear Drain Fail

 
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Old 12-26-2017, 06:41 AM   #1
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Linear Drain Fail


I installed a schluter Kerdi linear drain a couple of days ago and I have a problem.

My drainage riser and trap are 2” pvc. I have no access to the plumbing from below so I have to mortar the linear drain to the subfloor and glue the riser below and the stub connected to the linear drain in one shot.


I attached the stub of pvc to the linear drain with the appropriate coupling. To calculate the stub length, I measured the distance between the top of the subfloor and the stop in the coupling attached to the riser. From that number I subtracted the length of the drain outlet on the linear drain sticking into the drain whole and added 1/8” for mortar.

This number should be my pvc stub length.

I attached the drain as described above and held the drain down for 30 seconds to make sure the pvc firmly bonds. I did feel the pvc pushback against my downward pressure but I held it down and I thought it connected fine. I have 3 pipe clamps holding the trap in place so it really cannot move down on me.

After I installed my linear shower tray, I noticed the drain was sticking up near the drain outlet. It’s sticking up about 3/8”. I think The Stub length of pvc pipe is too long or something else went wrong.

I’m going to use an internal pvc cutter to remove the linear drain and try this again. But I want to know what went wrong.

Here are my guesses of where I messed up:

1. 1/8” thick mortar was over estimated.
2. The pvc pushed back when gluing and created additional length causing the drain to not sit flush.
When gluing pvc, it should be held down longer than 30 seconds. I’ve heard it moves even after 1 minute.
3. I over calculated something else

Any thoughts on where I went wrong?

When gluing 2” pvc pipe to a coupling do I need to get the pipe the entire 3/4” way into the coupling? Is there a margin of error here. That could help me make sure I don’t mess up again.

I’ve attached some pics so people know what I’m talking about when referring to a linear drain.





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Old 12-26-2017, 08:10 AM   #2
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Re: Linear Drain Fail


I'm guessing you miscalculated something in relation to the installed height of the shower tray. Figuring an 1/8" for mortar is probably fairly accurate if you're talking about the mortar to set the tray.

I would just try again now that you have the tray set and see how it works out from there. Make sure your drain pipe is very secure, we usually use plastic pipe strapping to hold it in place.

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Old 12-26-2017, 08:47 AM   #3
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Re: Linear Drain Fail


Pad under the trap so it can't move when you push the body down.

Sometimes it's easier to hold the body in place and measure the stub required.

Yes, full insert.

I assume you did not mortar the support and drain body in place per the instructions seeing as you think you can remove the drain body?

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Old 12-26-2017, 09:28 AM   #4
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Re: Linear Drain Fail


Last two I did from above I cut a small access in the sub floor and made the connection with the fernco instead of glue. Patch floor and proceed.
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Old 12-26-2017, 09:41 AM   #5
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Re: Linear Drain Fail


That brings back a bad memory, since I did it, too. The mistake was probably the loose trap, so the pushing moved the trap down instead of inserting the stub fully.
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Old 12-26-2017, 10:18 AM   #6
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Re: Linear Drain Fail


Tom, good call on measuring the stub length with the channel body in place.


Golden, that’s how I did my first Kerdi install. All cast iron, ferco, and access hole.

Tjbnwi,
What happens if I don’t get a full insert? Say I come up 1/4” short. Will the pipe leak?


I’ve got the trap secured with 3 plastic pipe straps. It should be secure.

Thanks guys!


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Old 12-26-2017, 03:13 PM   #7
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Re: Linear Drain Fail


Quote:
Originally Posted by RookiePlumber View Post
Tom, good call on measuring the stub length with the channel body in place.


Golden, that’s how I did my first Kerdi install. All cast iron, ferco, and access hole.

Tjbnwi,
What happens if I don’t get a full insert? Say I come up 1/4” short. Will the pipe leak?


I’ve got the trap secured with 3 plastic pipe straps. It should be secure.

Thanks guys!


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It could.

You need to pad under the trap, that is where the pressure is applied to seat the pipe stub.

Tom
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Old 12-26-2017, 09:54 PM   #8
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Re: Linear Drain Fail


Tried again today and I believe it failed. I stacked tiles on the drain in hopes of a miracle.

I used a longer coupling this time ( 1 3/8” insertion vs 3/4” )and cut my stub 1/4” shorter than required. Even that couldn’t get my linear drain flush with the tray.

Tjbnwi is right in saying I need support under the trap. I’ve got 3 pipe straps supporting the pipe after trap, but sadly nothing under the trap.

Will check it out in the morning.


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Old 12-28-2017, 09:02 PM   #9
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Re: Linear Drain Fail


So it seems a miracle might have happened. The linear drain dried up flush with the low side of the tray.

i didn’t quite get full insertion into that pvc coupling.**maybe 1” out of 1 3/8”.

How long after my water test can I start to tile?








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Old 12-28-2017, 11:09 PM   #10
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Re: Linear Drain Fail


You can tile once you drain the water from the water test.

Tom

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