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Old 12-07-2010, 01:41 PM   #1
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Do I need seperate vent stacks for basement pump and basement sink?


I am working on drawings for my basement remodel and have a question about venting a sink and pump.

I plan to use a drain pump (something like the Liberty 405) to pump water up to the main drain line of the house which is about 6' above where the sink drain level will be. I still have some homework to do on this as far as calculating if the drain can handle the pump output etc...

My question is about venting the pump and the sink. I understand I need to vent the pump to the roof. Do I also need to vent the sink? I think I do since I need a P trap to keep the pump pit gasses out of the room. If this is the case can I use the same vent stack as the pump or does the pump vent need to be dedicated?

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Old 12-07-2010, 04:30 PM   #2
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Do I need seperate vent stacks for basement pump and basement sink?


First, let me tell you this answer is not based on any code book of any kind. I am going to tell you what has worked for me

I have a little pump tank in my basement that catches my slop sink and urinal. It pumps up to my 4" main about 8 feet. Both the inlet and outlet are on top. I have two san tees stacked in the vertical riser and a studor or air admittance valve on top. The tank vent is also on top and I reduced the vent size to a 3/8" copper tubing adapter and stuck a piece of copper tubing through my block wall. It functions perfectly. I might catch some grief for this "rigging" but it has only been like that for seven years.

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Old 12-07-2010, 08:08 PM   #3
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Do I need seperate vent stacks for basement pump and basement sink?


studor vents do not work on pump basins. air has to be able to leave the basin as it fills with water, and aav's only let air in. all fixtures need a vent, including the ones plumbed into a sewage ejector, but you don't have to run them separately out of the roof.
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Old 12-07-2010, 08:54 PM   #4
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Do I need seperate vent stacks for basement pump and basement sink?


My pump tank has a vent, but my fixtures don't. It works fine
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Old 12-07-2010, 10:40 PM   #5
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Do I need seperate vent stacks for basement pump and basement sink?


Quote:
Originally Posted by broox View Post
My pump tank has a vent, but my fixtures don't. It works fine
doesn't mean its right. not to be rude, but this isn't diyhackroom.com people come here for advice from professionals, not "it works good for me"
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Old 12-07-2010, 11:28 PM   #6
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Do I need seperate vent stacks for basement pump and basement sink?


I am going to bed, maybe I will feel more argumentative tomorrow.

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