OK NOT to use a Long Sweep 90 at the bottom of a drop?

Speede541 · Aug 23, 2010

This, I hope, is my last question concerning my 4" CI waste stack.

The following pic is a 4" regular 90 at the base of a 9 foot vertical drop. Wouldn't a long sweep normally be installed in this situation, in order to ease the transition of solid waste from vertical to horizontal?

I already test fit a long sweep â€” it fits fine â€” and will be installing it today. Just curious as to why a long sweep fitting might not have been installed here originally (it was installed a year ago).

hj · Aug 23, 2010

No way to tell. Either they did not have one, or they did not want to fight it and have the band in the floor or bottom plate of the wall upstairs.

Sponsor · 2022-01-29T12:20:58-0800

Speede541 · Aug 23, 2010

Sorry, HJ, I should have phrased that differently -- I know this isn't a mind reading forum!

My real question should have been along the lines of guidance for when to use one over the other. In fact, with medium sweep 90s available, that complicates my question. Is it a matter of measuring the distance of the vertical drop?

As is, the coupling is smack between the floors, which made it difficult for me to get at. With the long sweep 90, I've got room for the adapter AND a riser clamp above the floor plate.

DavidTu · Aug 23, 2010

Is that a regular 90 or a "Short Sweep" (which is actually longer than a regular in CI)? If it is a SS the sweep is as long as a ABS Long Sweep, so perhaps if it is SS it is OK as-is since obviously an ABS LS is OK there. (My inspector will allow a SS-CI to be positioned horizontally, for example.) I don't have my books in front of me here so maybe they make the exception for horizontal but not vertical... but as far as the sewage is concerned, I don't think it knows if it is in CI or ABS

Speede541 · Aug 23, 2010

Well, it's not a true hard 90 like I've seen in PVC, but it's the shortest 90 I've seen in CI. Maybe they only make SS in CI? Dunno.

In the months this waste line has been in use servicing a toilet flushed with a 1.5 gallon bucket of water into the bowl, I haven't had any problems, and no evidence of solids left behind now that I've opened it up, so I'm guessing the 90 that was there was OK. But I figured that since I'm here, and the long-sweep fits, may as well work it out.

Shacko · Aug 23, 2010

Long sweep from vertical to horizontal, short sweep from horizontal to vertical.

hj · Aug 23, 2010

bend

It is a cast iron 1/4 bend, but even though it approximates an ABS medium sweep, it is still classed as a short sweep.

Speede541 · Aug 24, 2010

Again, thanks for the discussion. As I mentioned, I was going to change it anyway, and just want to follow up with before and after pics. The long sweep worked out well, and while I was at it I made adjustments to the routing.

90Â° bend, before (short sweep) and after (long sweep). Note that the coupling was "trapped" between floors previously.

On the floor above, in the 2nd photo, I was able to move the riser clamp to the long sweep fitting itself. The silver 2-band clamp is the top of the long-sweep 90.

Speede541 · Aug 24, 2010

Downstairs, on the reverse side of the shear wall, I eliminated the 45Â° drop in favor of a little extra storage space above an upright freezer that will be against that wall. That's a medium sweep 90 feeding the short horizontal segment, which itself is fed by the long-sweep 90 into a short-sweep 90. I'm thinking of framing a soffit around the horizontal portion but not sure if I'll leave the vertical portion exposed.

Ian Gills · Aug 24, 2010

Don't forget your nail guards.

Plumbworker · Aug 24, 2010

why are you cashing out for those husky bands ? regular missions would work just fine..

Speede541 · Aug 24, 2010

Ian Gills said:
Don't forget your nail guards.

Yeah, thanks. There's a downside and an upside to posting these pics this way. I keep coming back to the various threads looking for things to unnecessarily change, but I also keep finding things I missed. I noticed I missed a couple of nail plates that I'm absolutely positive I would have driven a drywall screw through!

Speede541 · Aug 24, 2010

Plumbworker said:
why are you cashing out for those husky bands ? regular missions would work just fine..

'Cause I'm friggin RICH!

Naw, it's not that.... this was covered in another recent thread of mine, but I was duplicating what the plumber ahead of me did, and what I've seen elsewhere. The forum straightened me out, but I can't say I'd have switched to the two band given the info. I used those standard 2-band couplings on my dry connections and a couple of places where I was cramped for space. But I'm more comfortable with the 4-band and in retrospect am OK with the small price premium I paid for them.

Dlarrivee · Aug 24, 2010

I don't see a problem with using a better clamp, even though you can get away with a lesser...

DavidTu · Aug 25, 2010

speede541 said:
That's a medium sweep 90 feeding the short horizontal segment, which itself is fed by the long-sweep 90 into a short-sweep 90.

In CI, I believe there is long sweep LS, short sweep SS, and 1/4 bend in decreasing sweep sizes... (my plumbing supply sometimes calls the 1/4 bend a medium sweep, but that makes no sense to me

).. so it looks to me like it's a 1/4 bend into a LS into a SS into a 1/4 bend after the horizontal. At least that's what I've gleaned.

Not that it matters to a flush.

Speede541 · Aug 25, 2010

Well, obviously I'm a noob and just going off what my local supply house calls 'em, so I don't know for sure one way or the other.

Here's what they call 4-inch "90", "MS" and "LS" (ignore the 3" label on the bin I've got them stacked in front of):

OK NOT to use a Long Sweep 90 at the bottom of a drop?

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