My house was build in 2003. Plumbing is PVC. All three bathroom toilets stop up often. The large drain from one of the upstairs toilets is sloping "uphill" to the main drain under the house. What's the best way for me to correct this? Can I cut away some of the vertical pipe and raise to proper downhill slope? What's the best method?

Thanks!
Jim

Hi Jim,
Can I cut away some of the vertical pipe and raise to proper downhill slope? What's the best method?
Sorry you got a "bad plumber". That error should have been caught at inspection. How much back fall do you have from the closet bend not the sanitary tee in the stack? If you have the room to make a cut on the raiser and either glue in a coupling or install a shielded metal coupling then that's the way I would go;. Give the pipe 1/4" to the foot slope. Good luck, tom

Sure, cut the pipe at vertical section, cut out small piece to give you proper slope, re-glue and you are back in business...

Can my reverse sloping problem cause other toilets to clog? Does it cause some kind of a pressure problem that keeps other drains from working properly?

Thanks!
Jim

Back-sloping sewer branch pipe should have negative effect only on the fixtures it services. Unless there are other fixtures connected directly to this pipe, it should not have any negative effect on waste water flow of other fixtures.

No pipe should be back-sloped. However, in some instances, you could leave the way it is and you would probably never notice it (... like washing machine, or small hand sink drains ). Toilet is the worst fixture to have back-sloped drainage

Can my reverse sloping problem cause other toilets to clog? Does it cause some kind of a pressure problem that keeps other drains from working properly?

Thanks!
Jim
Set your mind at ease Jim.
This backfall will only affect the one toilet. Once that's repaired you're good to go. Good luck, Tom