waste pipe slope: how much is too much?

The only problem with too much slope is that velocity will be higher and solids *may* tend to settle out.

I would install cleanout TEE's brought up to the surface at each end.

Jim

Yes, that's too much. You should go for between 1/8" and 1/2" per foot, trying for as close to 1/4" per foot as you can get.

go as far as possible with the standard slope (.125/.25" pf) and for whatever elevation is remaining, make a jog with a pair of 1/8 bends. do not use ells for this. you must be able to run a cable through it.

bill

I have that much slope or a little more and have had no problems in the

Bob S.

I've heard this all my life. Not wanting to start a war but can someone prove it is true?

I just don't buy it; for a couple of reasons. Sediment doesn't settle out in a flowing stream. It only settles in eddies or broad flat stretches with slow flow.

Even if it is true, the second flush liquid will push the first flush solids.

And the ultimate slope, a vertical drop, doesn't seem to be a clog problem due to settling.

Vertical has gravity working for it along with no drag. A steeper than appropriate drop could certainly have issues with solids settling on it. The flow ends up being 'too quick' and moves over the solids instead of just pooling up slightly behind it and forcing it along. I think there's also the issue with how solids might build up over time. I'm sure there's a more scientific explanation out there.

I don't get it. Why wouldn't this be even worse with an average drop? The liquid would go slower but so would the solids.

Remove NOPSAM to email me. Please let me know if you have posted also.

The most important feature should be that during the entire run, you always proceed toward larger pipes.