View Full Version : Basement plumbing rough-in

10-29-2009, 05:17 PM
I'm new to this website and forum. I'm looking for some guidance on what plumbing setup I have in my basement (what goes where) and how to proceed with installing a full bathroom. Ideally, I'd like to have a sink and toilet along the wall and a shower in opposite corner. I'm an avid DIYer but have little plumbing experience. My house was built in 2005 and the builder roughed in the plumbing in basement for a bathroom in a nook area of the basement next to the stairwell. Given the other problems we've had with the house I would not be surprised if the rough-in is not correct. I've attached a rough drawing of the layout with an explanation of each piece below:

"A" is a capped 3" PVC pipe that is 3" off the foundation wall, protrudes up from the slab about 12" and enters the slab with a 45 degree elbow.

"B" is a capped 4" PVC pipe that is 17" on center from the foundation wall, protrudes up from the slab about 12". "B" is 28" on center from "A".

"C" is a capped 2.25" PVC pipe that is 22" on center from the foundation wall, protrudes up about 8". "C" is 42" on center from "B".

"D" is a 3" opening with a slotted cap that is almost flush with the slab floor and is 25" on center from the foundation wall.

"E" is a 4" pipe that has a slotted cap that is recessed down in the pipe about 6" below floor level

Any help is much appreciated!

10-29-2009, 05:48 PM

Are the caps glued on or just press-on test caps?

I'd take the caps off and pour water down "C" and see if there is a trap installed. Hopefully there is. I'm guessing that's for a tub/shower. "B" is probably for a toilet - after a 2x4 wall and drywall it will pretty much be 12" OC from the finished wall.

I would expect there to be a cleanout and a vent in the mix. If you eliminate the trapped fixture as a shower it's at least a start.

Edit - I'm going to guess that "A" is the vent. Don't take anything I say as the gospel though. It's fun figuring these puzzles out.

10-29-2009, 06:02 PM
D and E could be a two way cleanout, and the others will be whatever the installer intended that they be, but we cannot tell without unplugging the risers and looking down the pipes.

10-29-2009, 06:52 PM
the caps are all glued on. sounds like I need to take them off and check water flow.