ᐅ The siphon or shower drain empties when the toilet is flushed.
Created on: 8 Jan 2021 11:26
S
Stefan2.84
Hello everyone,
We have been living in the house for about 7 weeks now. During the first 3 weeks, the guest bathroom with a shower on the ground floor was our main bathroom, as the actual main bathroom in the attic wasn’t finished yet. For the past 4 weeks, the guest bathroom has mainly been used for toilet visits (too lazy to go upstairs) but rarely for showering. Now the bathroom sometimes smells a bit like sewage. The odor comes from the shower drain. After 2-3 toilet flushes, the drain and probably the shower trap are empty, allowing the smells to come through. Is it normal for shower water to be drained when flushing the toilet? Where should I start looking to find the problem?
Attached are 2 pictures. One shows the plumbing rough-in. Maybe there’s a visible mistake in the pipe layout. The other shows the almost finished shower drain.
Maybe someone has an idea.
Thanks and regards
We have been living in the house for about 7 weeks now. During the first 3 weeks, the guest bathroom with a shower on the ground floor was our main bathroom, as the actual main bathroom in the attic wasn’t finished yet. For the past 4 weeks, the guest bathroom has mainly been used for toilet visits (too lazy to go upstairs) but rarely for showering. Now the bathroom sometimes smells a bit like sewage. The odor comes from the shower drain. After 2-3 toilet flushes, the drain and probably the shower trap are empty, allowing the smells to come through. Is it normal for shower water to be drained when flushing the toilet? Where should I start looking to find the problem?
Attached are 2 pictures. One shows the plumbing rough-in. Maybe there’s a visible mistake in the pipe layout. The other shows the almost finished shower drain.
Maybe someone has an idea.
Thanks and regards
S
Stefan2.848 Jan 2021 14:05Ok. So, there isn’t much I can do myself. I’ll have to contact the plumber. Would it be possible to fix this without having to tear everything open?
Stefan2.84 schrieb:
How large is an average clogging mass inside a pipe system? 🙂Well, after a tough night, it can really add up... :pBut seriously, as everyone has already mentioned here, the problem is definitely caused by the ventilation system.
Regards, Olli
S
Stefan2.848 Jan 2021 14:28That would be poor workmanship if something wasn’t properly designed. And in terms of odor, it can’t remain like that either.
Stefan2.84 schrieb:
That would be poor workmanship if something wasn’t properly designed. And it can’t be left like that because of the odor. Things like this can happen...
Of course, it can’t be left as is, so the plumbing trade should be called in again.
Olli
The venting for the 100mm (4-inch) pipe upwards is really missing here. (This refers to the venting of the wastewater pipe, not the room air!) The toilet flush creates a negative pressure that drains the shower. Unfortunately, these shallow construction designs tend to cause this. There is little water in the trap, and even minimal negative pressure is enough.
Where is the next wastewater vent? You can only see the pipe disappearing downwards.
Where is the next wastewater vent? You can only see the pipe disappearing downwards.
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