I'm making a new sewer line and it's L shaped. the long arm of the L goes along the house and will have 1 toilet and 3 sinks on it. The short arm of the L goes into the house, about 12', will have 2 showers, 1 toilet, 1 sink.

The old vent was at the corner of the L and that's the easy place to put it. But will that screw up the flow on the short side (inside the house) because the vent is after the source not before the source?

Do I need to make a vent before all the things get added on to the line or is it ok at the corner of the L? It's doable, but would require more work.

Thanks, KarlJay.

by the way, how do you add a pic? Do you have to upload it to a site first, then put in a link, or can you do a direct load from harddrive?

 

Load your pic on photobucket, then copy and paste the image link to put it here. Just paste straight into the quick reply screen, photobucket automatically adds the [img] tags to the url.

I would run a vent for each toilet, so at the elbow and at the end. Having the vent only at the elbow, you might wind up sucking the water out of the traps on the showers and sink.

 

I had a vent for the toilet, shower, sink. I was able to and the inspector allowed all those to join overhead with a 2" stack out the roof. This is the same one where I was tagged for 2" (instead of 1 1/2) for the toilet.

 

Each application is supposed to have its own vent, then you can tie them together (in the ceiling above the applicatiosn) to have only one penetration thru the roof.

 

Depending on the layout you may be able to get by with two vents. Are you replacing the plbg. or are you doing an addition? If you are redoing the plbg, one of the vents really needs to be 3". If you properly tie the fixtures together you can vent the showers and toilets underneath the house with the sink vents. There are restrictions on distances and pipe sizes when doing this and the venting underneath must be not be dry or flat. Again hard to say without a diagram, and your codes may vary from others.