Main stack vent necessary ? Garage plumbing

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Brendan Poirier

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Hello

Just built my garage this year and am currently installing my utility sink. My original plan was to put a toilet in the garage but that was ditched. For now I will only have a sink so I am wondering if running the main stack up through the roof is necessary since the sink has its own AAV. It goes to a septic tank which already has a vent stack from the house plumbing. Picture attached inside garage
 

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John Gayewski

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Guys it depends. If your going to install a toilet at any point in your life I would install the stack vent while your building. There's no realistic situation where more venting isn't good.

If your only ever going to leave it a sink it may not be worth it, but it could be necessary from your local codes perspective as a septic tank and plumbing system usually require seperate vents and your septic vent will be at a much lower elevation.
 

Sylvan

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I always run a line increased to 4" through the roof for my vent terminal.

You are in cold country so it is better to have a 4" vent to prevent hoarfrost

Depending on a piece of rubber and plastic to prevent toxic fumes from entering a structure is foolhardy

As John stated you're much better off venting the pipe like we do in civilized areas.
 
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Brendan Poirier

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Guys it depends. If your going to install a toilet at any point in your life I would install the stack vent while your building. There's no realistic situation where more venting isn't good.

If your only ever going to leave it a sink it may not be worth it, but it could be necessary from your local codes perspective as a septic tank and plumbing system usually require seperate vents and your septic vent will be at a much lower elevation.
the septic has its own aeration system. Honestly for now I will most likely leave it as is and will complete the main stack come spring. Im not going to climb onto the roof this time of year lol. And a toilet is never going to happen, ive decided its not worth the space I will lose in the garage, the house is 20ft away
 
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