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Old 02-13-2016, 09:31 AM   #1
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Main Waste Line Question


Hopefully I can explain this clearly....

House on single level with crawl space below. But, newest addition with 1.5 baths is about 18" higher, as is it's crawl space.

Older 2/3's of the house has 4" main waste line at crawl space grade and sloped correctly. The addition when done was all higher and they basically and oddly ran down their 3" main at a 45 degree slope to join the existing 4". Seems odd to me.

As I'm needing to correct some things in new section, I can change this. My thought is that it would be better to 1/4 turn vertical down, then 1/4 turn back to horizontal to join back to existing line.

Is this preferred, or the odd slope to where the two intersect? I guess third option would be to excavate way down in new area crawl, to match slope of existing but seems like a lot of work and would effectively bury the plumbing.

I think the way to imagine this might be a vertical stack from a second floor comes down 15 feet away from horizontal main waste line in crawl space. Would you run it at an angle until it intersects, or 1/4 turn and maintain slope until directly over main line and drop in top via a combo.

Thanks !!
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Old 02-13-2016, 09:38 AM   #2
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its fine, and it passed inspection, but can you post a picture? waste pipes can have more pitch as long as they are not back pitched...
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Old 02-13-2016, 09:48 AM   #3
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Presumably passed inspection, as I'm really not entirely sure when was done prior to our ownership. Things down here were rarely permitted back in the day and I heard this area was called a "green county" where all contractors did was grease the inspectors and everything passed.

That said, can't post a photo now as I demoed that area, and will need to reconnect in one of two ways, as mentioned above. Crux of question is will crap flow down hill better at a 45 ish angle or drop vertically before direction change. This is akin to a short second floor tie in of stack to main waste line below, just not as much vertical drop.

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Old 02-13-2016, 09:51 AM   #4
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either way is fine, there are many ways to plumb it correctly....just throw in a cleanout or test T on the line so if in the future you need to have a blockage removed there is access...
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Old 02-13-2016, 09:53 AM   #5
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Ok, thanks and will add the cleanout as well, to include one at far uphill (end of line) side of new area 3" main waste, where there was never one?
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Old 02-13-2016, 11:12 AM   #6
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put one where you tie in the 3 inch into the 4 inch....if you use a test T, they can clean in both directions..face the opening on the top side..
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