kitchen sink venting!

I'm finally ready to get my new kitchen going and need some advice on where to exit the sink vent. attached is a pic of the rear of the house. the sink will be right under the center window under the cedar shed roof for the first floor visible in the pic. I'm adding more windows for what it's worth for more light in to the kitchen. two ganged up rather than the one currently there. here's the question -- where to exit the vent? I can't go up to the main roof, so it needs to exit on the cedar shed roof. my concern is the two bedroom windows above. seems I'll be too close? the current situation is really bad for what it's worth -- right now the vent goes straight back horizontally and exits the wall below the ground floor kitchen window and the basement bulkhead -- you can see it in the pic. I know the inspector is the final word but would love to approach him of course with a plan that is smart let's say. I'm the homeowner, and doing the work myself. we're allowed to be the contractor here in NJ! thanks as always john p

 

As far as I know, you can not exit a vent below another window. Sewer gases can be released and re-enter the house through that window. I would look into an AAV (air admittance valve) mounted under the sink. Some refer to them as Studor vents if you want to google them. Basically a one way valve that lets air in but won't let gases excape.

 

Depends on your code, but generally this example of a code would be true:

903.5 Location of Vent Terminal

An open vent terminal from a drainage system shall not be located directly beneath any door, openable window, or other air intake opening of the building or of an adjacent building, and any such vent terminal shall not be within 10 feet (3048 mm) horizontally of such an opening unless it is 3 feet (914 mm) or more above the top of such opening.

Your code may read differently.

You say you "can't" go up to the main roof, but more correctly, that option should be on the table. There is always a way to get from A to B. It may not be easy or cheap, but it can be done.

 

thank you both. AN AAV (I believe these are used frequently for islands?) would be a great solution if OK. And I hear you on second story -- but again if AAV works far simpler! Is this simply a question for the inspector? thx again!