Hello, I would like to install a full bathroom in my basement. Currently I do not have any of the plumbing installed for this project. I would like the new bathroom to have a bathtub, sink, and toilet. Currently my under the slab main sewer drain is fully exposed and accessible (about 3 feet away) due to an earlier project. For me, I usually find that a picture is worth a thousand words. With that in mind, is there somewhere that I can get some pictures and or diagrams that will show me the proper sequence as well as maybe some best practices for the plumbing of the vents, drains, and traps for a basement project like the one I have in mind. I figure seeing the order of what goes in line first, second, third... etc is a good starting point for me to begin to get an idea of what I need to do prior to starting any real design.

Thanks,
Mark

Hey Mark,
You're going to like the basement rough in that I propose for you. One vent services the entire bathroom group. Most bathroom groups are roughed in like this.
Toilet connects to sewer main . Lavatory connects to toilet drain and runs a vent off the top the stubout tee out the roof or revents back into a dry vent in the attic.. The toilet wet vents through the lavatory vent and the tub/shower connects to the lavatory drain and is wet vented by it. This is a normal rough in and is acceptable both by local and state codes and also The Standard Plumbing Code Book in 90 percent of the country. Check your local codes.to make sure you're not in the excluded 10 percent.. The vent off the lavatory may be run out the roof or revented back into a dry vent in the attic or if you're reventing back into a fixtures dry vent you must make your connection at least 6 inches over that fixtures flood rim. Next question? Cheers, Tom

Thank's speedball1, excellent explanation. So now if I have another 2 bathrooms one on the 1st floor and one on the second floor each having 1 sink, 1 toilet, and 1 tub can I use the same configuration you provided for the basement bathroom, and join them into the sewer main one after the other and joining them into the same vent, again using your order of placement for each, one after the other?

Thanks again

Hello, I would like to install a full bathroom in my basement. Currently I do not have any of the plumbing installed for this project. I would like the new bathroom to have a bathtub, sink, and toilet. Currently my under the slab main sewer drain is fully exposed and accessible (about 3 feet away) due to an earlier project. For me, I usually find that a picture is worth a thousand words. With that in mind, is there somewhere that I can get some pictures and or diagrams that will show me the proper sequence as well as maybe some best practices for the plumbing of the vents, drains, and traps for a basement project like the one I have in mind. I figure seeing the order of what goes in line first, second, third... etc is a good starting point for me to begin to get an idea of what I need to do prior to starting any real design.

Ed