Help with a gurgling/bubbling shower drain

We own an apartment on the 8th floor of a 9-story building. We recently had rough-ins for a new curbless shower installed where our old tub was. We are at the point of applying the waterproofing membrane and I noticed there is a gurgling noise coming from the drain whenever someone flushes a toilet in another apartment (upstairs, I think). The water in the p-trap bubbles. I’m not sure why this is a happening as the drain seems like it should be properly vented at the stack.

In case it isnt clear from the pictures, this is the set up: a Schluter Kerdi-line drain attached directly to a 1-1/2” cast iron p-trap via a Fernco flexible 2-1/2″ to 1-1/2” reducing coupling. The p-trap was fitted directly to the vented stack. The drain sits only about 8” from the stack. There is nothing else attached to this line in our apartment.

Before we lay down the water-proofing and the tile, is there anything we can do to fix this? Is it likely to cause any problems other than the a nnoying noise?

Thanks for reading!
[Shower stack](//muut.com/u/brownstoner/s3/:brownstoner:M0Fe:showerstack.jpg.jpg) [Shower stack](showerstack.jpg) [New p-trap](//muut.com/u/brownstoner/s1/:brownstoner:56Vi:newptrap.jpeg.jpg)

encarnacionroger

in Plumbing 5 years and 7 months ago

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GreenThinker | 5 years and 7 months ago

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It’s hard to make out the piping, but i see 3 pipes, the middle one looks like it’s connected to the left larger pipe. I could be wrong, but they could have connected the pipping to a vent stack and not the drain stack itself. The Drain stack being the larger pipe on the left, and the smaller middle stack is a vent stack from the apartment below.

GreenThinker | 5 years and 7 months ago

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Personally, I’d switch it out for a 2″ P-trap. (The standard size for a shower trap) I’d also go up on the roof and check if nothing is blocking the vent itself, it should also have a rain cap/screen.