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Old 11-16-2017, 07:47 PM   #1
Lou_MA
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Kerdi drain not fully seated - acceptable?

Installed a Kerdi drain and mud pan today, and when dry fitting the drain, noticed that it didn't seat fully on the riser.

I thought "no big deal" and figured when I primed and glued the connections, it would bottom out. Did my normal approach to setting drain - loose mud up to drain hole, butter the underside of the drain flange with thinset, prime and glue both ends of connection, set and twist.

Turns out the drain still didn't seat fully (every time I pushed down further, the whole drain / plumbing assembly just bounced) but now, the glue had had gone off. Took my chances and finished packing the pan, but now I'm having second thoughts.

The drain is 1/4" away from being fully seated which - by examining another drain - means there's about 9/16" of a glued connection.

Will a flood test indicate whether the connection is good? Any consensus on whether to leave or replace? The riser itself is basically a coupling and a few short lengths of pipe, so I don't think I'd be able to get a clean cut with enough reusable length left.

Probably the 100% technically correct answer would be to remove and replace. Posting in this forum to see if this would fall in other pros margin of error.
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Old 11-16-2017, 08:39 PM   #2
Kman
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Flood test it, shouldn't take much water to tell you.

I've seen plumbers glob more cement around leaky fittings and they hold just fine under air pressure tests.

Fortunately, there's very little pressure on the fittings from water draining out, so you should be okay.
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Old 11-17-2017, 08:33 AM   #3
Eschbach
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That drain will be fine.No worries
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Old 11-20-2017, 05:38 PM   #4
Lou_MA
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Thanks guys, appreciate the replies
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