I've attached an image to describe the current layout as best I can. The above half is the current setup. The washing machine is connected by a gray flexible hose. At the connection point, that vertical section if pipe is about 2' long. It then elbows 90 degrees to the long horizontal run.

Here's the new plan. I want to add a utility sink, and also move the washing machine about 6 feet closer to the main drain location. I would add some slope to that long horizontal run. I plan to remove the trap located at the bottom right corner. Is that OK? I wanted to either put one trap, as marked near the sink, or maybe even put two traps, one located at the "normal" spot under the sink, and one located right before the washing machine. Does this look all right? Do I need some venting? What kind of tee should I use for the split between the utility sink and the washing machine? Please, any other suggestions would be greatly appreciated. Thank you.

What has me mystified is that your original set up drained at all. Undersized pipes, no vent, no fall on the drain line and a trap located over 25 feet away from where it should be. Amazing!

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I plan to remove the trap located at the bottom right corner. Is that OK?

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That trap never should have been there in the first place.

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I wanted to either put one trap, as marked near the sink, or maybe even put two traps, one located at the "normal" spot under the sink, and one located right before the washing machine. Does this look all right?

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EVERY fixture that drains requires a trap and every trap MUST be vented. You may vent both the washer and sink through a vent off the sink. This vent must be run out the roof or it may be revented back to a existing dry vent in the attic. If local codes permit you could get away with installing a AAV, (air admittance vent) on the sink. I would increase the size of the pipe to 2" and give it slope at 1/4 inch to the foot.( You'll have about 5 inches of fall on the new job.)
If possible I would trade places between the washer and sink. This way the washer discharge wouldn't be able to come up in the sink if there were any back pressure.
Keep the drain low and raise to pick up the sink with a Sanitary Tee on its back. This will raise to another San Tee to pick up the sink and a vent will take off from the top of that tee. The 2" drain line will continue on and connect into the stack with another San Tee. Good luck, Tom

Will this work? I vent is running back to the same stack that the drain goes to. The washing machine and sink location is the same as the first image. And of course, thank you for your fast reply.

Looks like previous HomeOwner was doing some plumbing on your house. :-D Your original set up tells me that washing machine used to be at the trap location. I don't want to repeat the basics. Tom already gave you all details about your installation. Do what he said and you will fine.

Or maybe this option. I think this is closer to what you describe speedball1.

That trap riser has to go straight up. You show 90 and then another 90 and then you continue to soil pipe.

Obviously, this set up is to extend reach of your drain to your W/M discharge. Do this: cut the horizontal section, glue in coupling, then glue in section of drain long enough to move the trap as close to your W/M as possible, and than glue together with the other section.

Vent for sink is fine. You are still missing vent for W/M. But with proximity of the sink to the W/M, I think you will be fine.

The bottom one is more what I had in mind. I wan t to keep the sink trap well above the drain line to prevent the washer discharge from backing up into the sink. In fact I sure would like to see the sink installed upstream from the washer if possible. Regards, Tom

Go by your second design... In my area we use Comby fitting for transition from vertical to horizontal. The other San T is fine.

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Originally Posted by Milo Dolezal

Go by your second design... In my area we use Comby fitting for transition from vertical to horizontal. The other San T is fine.

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For the combination fitting, is that basically a san-T but a longer "arm" section? I'm found this picture. http://www.canlii.org/on/laws/regu/1...97r.403_20.gif looking at picture 5. You suggest changing the lower of the two from a san-T to a comby fitting?


Will my venting be sufficient?

BTW- the previous homeowner just plain mutilated the entire DWV system down there. If you saw the strange trap/T configuration they had for the original trap location, then the 20+ foot run they had, you'd easily go mad. The 20+ foot run is actually 3 sections of pipe, a 10', 4', and a 8', all coupled by flexible rubber couplers that have hose clamps.

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Originally Posted by mtnbkr

For the combination fitting, is that basically a san-T but a longer "arm" section? I'm found this picture. http://www.canlii.org/on/laws/regu/1...97r.403_20.gif looking at picture 5. You suggest changing the lower of the two from a san-T to a comby fitting?


Will my venting be sufficient?

BTW- the previous homeowner just plain mutilated the entire DWV system down there. If you saw the strange trap/T configuration they had for the original trap location, then the 20+ foot run they had, you'd easily go mad. The 20+ foot run is actually 3 sections of pipe, a 10', 4', and a 8', all coupled by flexible rubber couplers that have hose clamps.

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That "comby" fitting is called a Combo or a Combination Wye and Eighth Bend. (No.#5 in your link) While we would use a san tee on its back I'll go along with using a combo. Your vent will be fine as long as it doesn't connect into a line that has fixtures draining into it. Good luck, Tom

That would be #5 in your link: Y with 45 street fitting glued to it. They also sell it as Comby Y which has both fittings already combined in one piece. As far as venting goes, Tom gave you my answer...

If I downward slope the vent, so that is is like the drain, that would ensure that no water... or at least minimize the ability for water to flow in that direction. Would you recommend doing this? Also, what fitting would you use for connecting the vent back to the stack?

You should go 1/4" per foot upward with your horizontal vent. Not downward.

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Originally Posted by mtnbkr

If I downward slope the vent, so that is is like the drain, that would ensure that no water...or at least minimize the ability for water to flow in that direction. Would you recommend doing this? Also, what fitting would you use for connecting the vent back to the stack?

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The vent must be sloped back to the drain and you will run your vent off the top of the sanitary tee that you will pick up the sink with. Good luck, Tom

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Originally Posted by Milo Dolezal

You should go 1/4" per foot upward with your horizontal vent. Not downward.

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Originally Posted by speedball1

The vent must be sloped back to the drain

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I think you guys are saying opposite things. Am I misinterpreting someone?

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Originally Posted by mtnbkr

I think you guys are saying opposite things. Am I misinterpreting someone?

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No! We just said it differently. The vent will slope up from the drain line and slope back to the drain line. Same result, different wording! Tom

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Originally Posted by speedball1

No! we just said it differently. The vent will slope up from the drain line and slope back to the drain line. Same result, different wording!. Tom

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Thanks for clearing it up! Also, thanks to you both for the help. Hopefully I'll get this done tonight :-)

Good luck. Let us know if you need any additional help. Also, photos are very helpful getting your point across...