ᐅ Odor trap for drain on flat roof

Created on: 17 Sep 2017 12:10
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DauerBauer
Hello everyone,

We are currently building a roof terrace on top of our flat roof.
We have noticed that there is a smell like a sewer coming from the roof drain.
Is there any kind of valve insert or similar that can be retrofitted into the pipe?
It should be a standard 100mm (4 inch) PVC pipe.

The alternative would be to break open the wall on the ground floor and install a trap there, but that would be a lot of work...
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Bau-Schmidt
17 Sep 2017 18:35
Rainwater significantly strains the capacity of wastewater treatment plants and is also ecologically completely nonsensical.
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toxicmolotof
17 Sep 2017 19:50
That may be true, but it won’t help you much. At least not if the city doesn’t plan to excavate all the streets and require all property owners to dig up their land to separate the wastewater.
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DauerBauer
18 Sep 2017 09:57
The street line was "piped" shortly after the war, as people probably had other concerns than separating greywater and rainwater at that time. But the tip is good, thank you for that. I’ll go ahead and install a second pipe in the yard when I repave.

But back to my actual problem: Is there a trap that can be retrofitted into a vertical pipe?
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Bieber0815
18 Sep 2017 12:51
In DN 100 pipes, there are so-called soil pipe odor traps. These contain a spring-loaded flap that opens when water flows through and remains closed otherwise (keyword: "Fallrohr geruchsverschluss" in an internet search engine of your choice).