Hi I need some help with venting bathroom plumbing properly. I am adding a new bathroom and I'm uncertian if I need to add these extra vents "in green on my diagram"


http://i61.photobucket.com/albums/h57/viper92086/newprojects/plumbing2.jpg

The tub is about 2 ft away from the toilet so I figure if I added the vent to the tub I would satisfy the 5ft rule. Any suggestions? Thanks

Here's the plumbing diagram since I couldn't figure out how to embed it into the orignal post.
http://i61.photobucket.com/albums/h57/viper92086/newprojects/plumbing2.jpg

You are not stating what plumbing Code you work under. If it is UPC than - and according to your drawing, you would fail rough-in inspection. Here, you have to have vent for tub, toilet and sink. However, you can combine all of them into one 2" vent about 48" above the floor. Then, continue with 2" vent all the way above the roof. Hope that helps. Milo

Milo gave you UPS code, In Florida w(SPC) we do things a little different. Your washer and kitchen vents are just fine but we wet vent our bath rooms, (see image) Where do you live and what code do you fall under? Good luck, Tom

Thank you Milo and Tom. I'm in the state of NJ. I think I fall on nspc, which I assume is the same as SPC? If that's the case I should be fine with my current setup, but it shouldn't hurt if I added the vents in green correct? Also is it possible to use Tee's horizontally if used only for dry venting? Thanks

Why c complicate things? Is wet vents are allowed. Connect the tub drain to the lavatory drain and the tub and toilet will be wet vented. Good luck, Tom

Tom,

I think the max is 9' for wet venting. Currently the tub and lavatory both drain directly into the main house drain that it currently suspended along the main support beam. The closest vent upsteam is about 15 ft and the closest vent downstream is about 3 ft. When it comes to venting I thought you must take only the vent upstream in consideration. Is that right?

Currently the tub and lavatory both drain directly into the main house drain that it currently suspended along the main support beam. I wasn't aware the work was already in.

When it comes to venting I thought you must take only the vent upstream in consideration. I don't know what you mean. Every trap should have "cconsideration" no matter if it's up or down stars . Are you referring to your set up or vents in general ? Let me know, Tom

Vents in general. It made sense to me that you'd want to take in consideration air behind the flow of water. This would leave the current 2" vent only covering the sink since its only upstream to the sink. It seems like I might be completely wrong about this?

The way I see it, (see image) your toilet's wet vented by the tub vent which is revented back to the lavatory vent.

is it possible to use Tee's horizontally if used only for dry venting? Sure if you use a vent tee, (see image)

Thanks Tom!