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It's GOT to be more than that. It's got to be at least a 9 degree slope. All that crap and toilet paper would HAVE to clog up a 2% slope. How can a 2% slope get rid of all the waste? It just doesn't seem possible.

Who has a septic tank? I'll bet you have more than a 2% slope.

It's GOT to be more than that. It's got to be at least a 9 degree slope. All that crap and toilet paper would HAVE to clog up a 2% slope. How can a 2% slope get rid of all the waste? It just doesn't seem possible. Who has a septic tank? I'll bet you have more than a 2% slope.

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[–] • 2 pts

The problem is, with that kind of slope, it won't stay that way, it'll go level occasionally if it's a long run.

I'm no pro though.

[–] • 0 pt

What do you mean..."it'll go level occasionally"?

According to , it's a done deal. Trial and error.

[–] • 0 pt

Well I'm sure they know more than me. But I was in roofing for 30 years and we'd never apply roofing material (shingles) on any slope under a 4/12 pitch, because as the water runs off, it will meet with areas that are NOT the correct slope, if it was under that pitch, due to some natural flattening (for lack of better time) that happens over time.

[–] • 0 pt

Plastic drain pipes are not 100% straight, most have a bit of a bend/warp/curve. But if the run is mostly a drop of .25 inches per foot, it will work out.