# drain slope question - UPC

Discussion in 'UPC Plumbing Code Questions' started by steve-c, May 11, 2012.

1. ### steve-cNew Member

Joined:
May 2, 2012
Location:
Bellingham, WA
Hello - I'm a little confused about the 1/8-1/4" per foot slope rule for waste pipes. My understanding is that the UPC rule for waste pipes carrying solids is generally 1/4"/ft minimum (or vertical). What about pipes from showers, sinks, or clothes washers? Can they slope after the vent at more than 1/4"/ft, say 45 degrees or any angle up to vertical? This is probably a dumb question but I haven't found a clear explanation.
Thanks.
Steve

Last edited: May 11, 2012
2. ### hjModerator & Master PlumberStaff Member

Joined:
Aug 31, 2004
Occupation:
Plumber
Location:
Cave Creek, Arizona
They can slope at 11 1/4, 22 1/2, 45, 60, or 90 degrees, because they make fittings at those angles, but you can use intermediate slopes by combining fittings. SO to answer your question, as long as it has the specified minimum slope, (and the minimum varies according the the pipe diameter), any slope is acceptable.

4. ### steve-cNew Member

Joined:
May 2, 2012
Location:
Bellingham, WA
Thanks HJ.