Adding a basement sink

[Chris MN]

Hello,
I've done quite a bit of searching but I can't seem to find a good "how-to" for my situation. I have a new home that has an unfinished basement. I had the builder rough in plumbing for a basement bathroom elsewhere but I would also like to add a utility sink in the mechanical room. I want to make sure I do the drain venting correctly but I'm not sure how. I have a drain stack located near where I'd like to add the sink. It is used by a bathroom and laundry above. I'm located in Minnesota, if that makes a difference.

The first image shows the mechanical room downstairs. The second image shows the bathroom and laundry above it.

I would like to add the utility sink on the stud wall on the left side of the picture. Please note that the pictures were taken before the house was finished.

Thanks.

 

[Smooky]

Vent connection of basement fixtures can tie into the vent 6” above the overflow rims of fixtures on the upper floor.
Take a look at this guide:
http://www.co.lincoln.or.us/sites/d..._-_helpful_hints_residential_construction.pdf

 

[Sponsor]

 

[Chris MN]

So there's no right way to do it without cutting into the walls upstairs? I really wish I had asked the plumber to do that when they were building the house.

 

[Smooky]

The alternative to tyeing into the vent would be to use an air admittance valve (AAV)

 

[Chris MN]

Are those allowed in Minnesota? Where can I look to find out?

 

[Chris MN]

It looks like an AAV is not allowed in MN. Is my only option to vent above the overflow rims of the above fixture?

Hi far can a vent extend horizontally? I could connect to the vent for the downstairs bathroom but it's some distance away.

 

[Smooky]

Look here:
https://www.dli.mn.gov/CCLD/PDF/pe_code.pdf


page 194
Air admittance valves prohibited. Mechanical devices and fittings with internal moving parts are prohibited from installation in plumbing venting systems.

 

[Cacher_Chick]

Most houses have walls which allow a new vent to be run up through the roof, or into the attic space where it can be connected to an existing vent. In single story houses with unfinished basements, we can usually run a new vent through a 1st floor wall without opening up the wall.