Re: Moving a basement toilet drain over a few feet... need help!
Posted by Deb on February 06, 2004 at 11:22:05:
In response to Re: Moving a basement toilet drain over a few feet... need help!
UPC and most other code requires 1/4" per foot. Slopes less than that are only allowed if structural conditions prohibit less and then only if the pipe os 4" or larger. The water outrunning the solids MAY HAVE applied with older piping materials with rough internal walls, but it simply does not apply to the newer plastic drainage line material that is in use today. I routinely run grade over 1/4" per foot if I need to without any problems caused by this. Do not run shallower.
The Pipewench

: You do not want to overslope that pipe.
: It should slope no more than 1/8 to 1/4" per foot for a three inch pipe, for example. Otherwise the water will flow quicker than the solids and create a potential clog with the solids left behind. A real possibility with some of the 1.6gpf toilets if people use a lot of toilet paper.

: I will add there's a constant debate going on about this slope issue amongst plumbers.

: : : I am completely refinishing my basement (gutted it out and starting from scratch). The design of my new larger bathroom (there was an existing bathroom) requires me to move the toilet drain to the left about 3 feet. The existing toilet drain goes straight down for about 24" and then bends out to the wall and into the back yard where I presume it meets the sewer line at some point or joins my main house line. I want to move the toilet to the left, and my question is how deep should the new pipe go straight down before it goes to the right to join the old pipe? Can it just immediately elbow to the right as long as I use the 1/4" per foot slope? I could actually have quite a bit steeper slope if that is better but I read that 1/4" per foot was the minimum. Also, can I just cap off the existing pipe above where my new pipe joins it?

: : You need a vent in there somewhere.
: : Deb
: : The Pipewench

Replies to this post
There are none.