Horizontal to vertical transition advice.

[jmose]

I've got to make a horizontal to vertical transition, unfortunately due to the position of a chimney I cant go straight up with a sanitary tee. I'll need to offset the transition a little, Should I go with the left or right on my diagram, or possibly something else I am not thinking of? I've been reading advice on this site for years, just never had my own question. Thanks in advance!

 

[John Gayewski]

The right. You'll have to do a rolling offset which can be a little tricky, but it's better.

 

[Sponsor]

 

[Reach4]

Right would be better if you can do it.

A shielded coupler or two might make this easier. With a glued joint, you have to get things right the first time and I think that takes a lot of practice.

There are push-in DWV fittings that are analogous to Sharkbite fittings for pressure pipe.

https://www.charlottepipe.com/Products/Assets/02C-PVC_List_Price/CTT-818%20(5-7-21).pdf

https://www.homedepot.com/p/PPI-2-i...PVC-ABS-Pipe-4-Pack-SPF-45L50-4pack/312662979 (this 2-inch 45 is just one example)

 

[jmose]

The offset is not much, in fact I may be able to make it work with no offset and just add a 22.5/11.25 at the end of the horizontal section to get it back parallel to the joists and make it easier to fit if it proves difficult to fit. I think I can make it work though.

 

[wwhitney]

FWIW, on that last drawing, to connect a vertical drain (actually plumb) at the location shown to a horizontal drain (2% slope) running as the lefthand straight segment does, you will need elbows adding up to more than 90 degrees of bend. it's geometrically impossible with just (2) 45 degree bends.

I don't think you can get a 3" DWV 11.25, but a 22.5 would work. Or you could try using a 45 and 60 instead of two 45s. I'd probably use the 60 as the lower elbow.

Cheers, Wayne

 

[John Gayewski]

FWIW, on that last drawing, to connect a vertical drain (actually plumb) at the location shown to a horizontal drain (2% slope) running as the lefthand straight segment does, you will need elbows adding up to more than 90 degrees of bend. it's geometrically impossible with just (2) 45 degree bends.

I don't think you can get a 3" DWV 11.25, but a 22.5 would work. Or you could try using a 45 and 60 instead of two 45s. I'd probably use the 60 as the lower elbow.

Cheers, Wayne

My interpretation is the first drawing he's doing the offset with the 45's and but instead of rolling the 45's to complete the vertical portion he's dropping into a 90 while the second drawing is a more traditional rolling offset.

I would call the first one a compound rolling offset and the second a rolling offset. The first one isn't really useful.

 

[wwhitney]

I would call the first one a compound rolling offset and the second a rolling offset. The first one isn't really useful.

My comment was in relation to the drawing in post #4.

As for the OP, the righthand version, if there are really just two 45s, with the inlet horizontal (2%) and the outlet vertical (plumb), then the arrangement is planar, and there's no offset.

Cheers, Wayne

 

[jmose]

Thanks everyone... i mocked up both configurations so you can see better, as stated the offset is minor... and I was able to get a 11.25 from supply house just in case i need it. I will go with the double 45 config. thanks again!!