Basement bathroom Vent question

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  #1  
Old 11-18-17, 08:13 AM
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Basement bathroom Vent question

Hello, I'm getting ready to install a full bathroom in my finished basement. My plan is to break out the floor and install the plumbing and run it to a sump pit to be pumped up to my main sewer line. I understand how to run the sewer lines, but I'm a bit confused about the venting. I know each fixture will need its own vent line, which is easy enough for me to do. However, I can't seem to find much information regarding how far the fixtures can be from the main stack.

I did consult my local municipality and they do not require me to pull a permit for this work, however I do want to do the work correctly the first time. I have a 2" vent stack on the opposite side of the basement from where the bathroom is going, this will be approximate a 30' horizontal run to tie into this stack. Is it okay to do this? The goal would be to tie the fixture into a single 2" line that would run over to the main stack.

I know I could use cheater vents as well,but I would rather not go this route if I don't have to.
 
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Old 11-18-17, 02:30 PM
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The sump pit will need to be vented. I believe the toilet and shower/bath don't need a separate vent and can be vented indirectly through the sump pit. The sink will need to be back-vented into this same vent (connected to the same vent).

The 30' run to a stack is fine - but does it have drains above? If so, you can't use it as a vent as it will be a wet-vent, which is no longer allowed. You'd need to run a 2" vent from the sump/sink up to the roof. If you can't get a shot up through a closet or similar, you can go outside and up.

I would definitely go with a true atmospheric vent and not use an AAV for this setup.
 
  #3  
Old 11-18-17, 02:56 PM
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Thank you for the response. I was wondering if I would be able to use the sump pit as a vent for the toilet and shower, because in my mind that made sense, so thank you for clarifying that. The vent does serve a sink on the main floor of the house, so I guess I couldn't use that then. I could easily run a vent outside the house, so that looks to be my only option at this point.

I think however since I will be breaking the floor out and digging to install the lines, I will just add a vent for the shower and toilet as well, I would hate to find out after I have everything finished that I need vents, and there would be no easy way at all to install them at that point.
 
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Old 11-19-17, 06:23 AM
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Attached are two pictures of the general layout of the plumbing I want to do. I want to get opinions to see if this would work correctly,
and I will do my best to explain. The shower will be the furthest away from the sump it, I will add an 1.5" vent pipe upstream of the shower drain which will go into an interior wall, then wrap around to meet the main vent. The toilet will be connected via a 3" wye, this will flow towards the sump pit. The sink will be the closest to the sump pit, I will have a 2" line tap into the 3" line that would be buried under the floor. This would serve as the drain line for the sink, and also the pipe would the continue up and would eventually tie into the main vent line for the sump pit. The vent coming from the shower would tie into this vent as well. The 2" line for the sink and the sump pit would both act as a vent for the toilet correct? Or would I actually need to install a dedicated vent for the toilet as well?
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  #5  
Old 11-20-17, 06:04 AM
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Doing some research it looks like I could get by without a dedicated vent for the toilet and shower both and thr 2" sink drain would act as a vent for the toilet and shower as well. Also the Sump pit would be vented as well so technically that could be a vent for those two as well. Correct me if I'm wrong.
 
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