Is the venting of the drain correct?

[NiSim]

Hello,
We have just hired craftsmen to renovate bathrooms, one of which (wc) was built in a new location. The craftsmen positioned the ventilation behind the new wall behind the toilet instead of leading the ventilation up to the ceiling. The idea is that we will then put up a drywall here, but if we do so we will end up enclosing the ventilation.

Is it correct for the craftsmen to make this solution for the ventilation (see picture)?
Or can I request that they redo it and lead the pipe out over the ceiling?
I will soon receive the invoice for the entire job...

 

[useless]

If you already have a vent through the roof, no more are needed.

But building in a vacuum valve like that is an extremely bad idea. In 10 years, the rubber in the valve will harden and start leaking, and then you'll have deluxe mold growth inside the wall.

If you're going to use a vacuum valve, it's better to place it on a branch under the sink.

 

[NiSim]

If you already have venting through the roof, no more are needed.

But building in a vacuum valve like that is an extremely bad idea. In 10 years, the rubber in the valve will have hardened and start leaking, then you'll have a deluxe mold farm inside the wall.

If you're going to have a vacuum valve, it's better to place it on a branch under the sink.

As far as I know, I don't have any other venting through the roof. The previous one was removed when the old toilet was demolished. So this vent is probably for both toilets, which are on top of each other in the floor plan. The other toilet is also on the ground floor, so it's most likely that this is the only venting that exists… 😦

 

[useless]

Municipal or private sewage?

 

[NiSim]

Municipal or private sewage system?

Private

 

[useless]

I will soon receive the invoice for the whole job..

You don't pay before the job is done, do you?

 

[useless]

Own

Then you need an open ventilation, so just ask them to continue upwards.

 

[NiSim]

You don't pay until the job is done, right?

I am quite dissatisfied with this company overall since the rest of the renovation is not yet finished, so I am not going to accept the invoice before it's done. But I have pointed out that I am not happy with the ventilation solution and only got the response that it will then be more delayed. So I'm considering disputing part of the invoice on the grounds that I need to hire another craftsman to do it correctly. But I want to check first if I am right in my case...