COMMUNITY FORUM

nycabin

06:40PM | 08/19/07
Member Since: 08/18/07
2 lifetime posts
Bvplumbing
Hi. I am new to this site,looks like a good one! Got a question. Are all fixture branch drain lines(tub, toilet, sink, etc.) required to connect directly to the vertical vent stack, or can each one be directly connected into the main horiziontal (actually 1/4" drop/ft.) 4" waste drain line before it enters the septic system? In my situation, the main 4" drain line runs the entire length (in the crawl space)of the bathroom & kitchen. It would simplify things if I could just run my fixture drains through the floor directly into the main sewage line. Hope this makes sense. Thanks. Pete

Sylvan

02:37PM | 08/20/07
Member Since: 01/24/06
1449 lifetime posts
Me_office1
I'm not sure what you mean.

NYC code for example requires 1- 4 " main vent stack to penetrate the roof and we can connect all the fixture vents horizontally to it.

Pitch the vent Away from the fixture so if there is any condensation it will flow back to the fixture drain being served and the vent has to be above floor level rim of the fixture NOT the over flow rim and the reason NY requires a 4" vent is to prevent hoarfrost

nycabin

07:49PM | 08/20/07
Member Since: 08/18/07
2 lifetime posts
Hi, Thanks for the reply! It's somewhat difficult for me to explain exactly what I am asking. From what I have observed and seen in plumbing books, all branch fixtures such as tubs, toilets, sinks, etc. drain into the main VERTICAL vent line, the pipe that exits through the roof. The waste material then enters the horiontal drain line then goes to the septic system. My question: Is it acceptable to connect fixtures such as the tub, toilet, sink, etc. into the HORIZONTAL drain line instead of the VERTICAL line? In my particular case the septic tank is located at the opposite side of the bathroom from the 4" vertical vent stack (that goes through the roof). The 4" horizontal drain line (sigthly sloped toward the septic tank) is positioned directly under the bathroom floor and runs its entire length to the septic tank. It would be easier for me if I could tap into the horizontal line than the vertical line. I hope this helps some. Thank again. Pete
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