I'm moving my basement laundry, and the kitchen sink/dishwasher above (they share a drain line). I don't think the current setup is correct, and I would like to try to make it correct when I move the drain.

Currently...

My house was built in the 1920s. It has a single vent stack(?) that emerges from the basement floor (the sewer line goes out the bottom of the basement) and goes all the way to the roof. On the second floor is the only bathroom group comprising a bathtub, sink, and toilet whose drains join together and then join into the three story dwv stack.

Just above where the 4" iron pipe emerges from the basement floor, there is a large wye with a cap (for cleaning out the sewer line?).

Somewhere below the floor a branch comes off the sewer line that emerges about 10' away as a 1-1/2" or 2" drain pipe. This pipe extends to the first floor where the kitchen sink and dishwasher discharge into it. In the basement, a laundry tub joins up before the pipe disappears into the floor. The washing maching discharges into the laundry tub.

There is no explicit vent anywhere in this line.

The Plan...

I'd like to run a new drain line of a larger diameter, that is better able to handle the washer's discharge directly (without it going into a tub first).

I'd like to still have a laundry tub, and I'd like to move the kitchen sink (eventually) to a location that would also use this new drain line.


The Questions...

Can I use the "cleanout" on the main 4" stack to connect the new line into the sewer line? I presume I would add another large wye to the existing wye, so that I still have a "cleanout."

How big of a line is needed to carry the washer's discharge? And how is this configured? Is it just a "large" diameter vertical pipe with a trap at the bottom? How is it vented (do I just leave it open and airy around the washer's hose)?

If I somehow get a clog in the line downstream of where the washer discharges, is there anything I can do to prevent the kitchen sink drainage from coming out the washer's standpipe?

Where else must I vent and can I use a "studer" vent? Starting from the top, I'll have the kitchen sink and d/w joined together then going through a trap. This line will extend to the basement where its diameter grows to whatever size the washer needs, then connects into the main "stack". Along this line the washing machine discharge and laundry tub (each separately trapped) join up.

That's a lot of stuff, but I wanted to include as much detail as I could so things are clear (hopefully I've succeeded).

Thanks!

-- Matt in Rochester, NY

Quote:

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Originally Posted by MCDennie

I'm moving my basement laundry, and the kitchen sink/dishwasher above (they share a drain line). I don't think the current setup is correct, and I would like to try to make it correct when I move the drain.

Currently...

My house was built in the 1920s. It has a single vent stack(?) that emerges from the basement floor (the sewer line goes out the bottom of the basement) and goes all the way to the roof. On the second floor is the only bathroom group comprising a bathtub, sink, and toilet whose drains join together and then join into the three story dwv stack.

Just above where the 4" iron pipe emerges from the basement floor, there is a large wye with a cap (for cleaning out the sewer line?).

Somewhere below the floor a branch comes off the sewer line that emerges about 10' away as a 1-1/2" or 2" drain pipe. This pipe extends to the first floor where the kitchen sink and dishwasher discharge into it. In the basement, a laundry tub joins up before the pipe disappears into the floor. The washing maching discharges into the laundry tub.

There is no explicit vent anywhere in this line.

The Plan...

I'd like to run a new drain line of a larger diameter, that is better able to handle the washer's discharge directly (without it going into a tub first).

I'd like to still have a laundry tub, and I'd like to move the kitchen sink (eventually) to a location that would also use this new drain line.


The Questions...

Can I use the "cleanout" on the main 4" stack to connect the new line into the sewer line? I presume I would add another large wye to the existing wye, so that I still have a "cleanout."

How big of a line is needed to carry the washer's discharge? And how is this configured? Is it just a "large" diameter vertical pipe with a trap at the bottom? How is it vented (do I just leave it open and airy around the washer's hose)?

If I somehow get a clog in the line downstream of where the washer discharges, is there anything I can do to prevent the kitchen sink drainage from coming out the washer's standpipe?

Where else must I vent and can I use a "studer" vent? Starting from the top, I'll have the kitchen sink and d/w joined together then going through a trap. This line will extend to the basement where its diameter grows to whatever size the washer needs, then connects into the main "stack". Along this line the washing machine discharge and laundry tub (each separately trapped) join up.

That's a lot of stuff, but I wanted to include as much detail as I could so things are clear (hopefully I've succeeded).

Thanks!!

-- Matt in Rochester, NY

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Hi Matt,
Let me take your questions in order.

(1)
Can I use the "cleanout" on the main 4" stack to connect the new line into the sewer line? I presume I would add another large wye to the existing wye, so that I still have a "cleanout."
Yes, A 4 X 2" wye will give you a opening to the main and still allow you to install a clean out.
(2)How big of a line is needed to carry the washer's discharge? And how is this configured? Is it just a "large" diameter vertical pipe with a trap at the bottom? How is it vented (do I just leave it open and airy around the washer's hose)?
A 2" discharge line is needed. The line is run with 1/4" to the foot slope and will go to a upright elbo with a tee installed. A 2" "P" trap will come out of the tees branch with a 36" stand pipe, (or a pipe that is higher then the lip of the washer.) The washer trap to be vented from the top of the tee. The washer discharge hose will then hook over the top of the stand pipe.
(3) If I somehow get a clog in the line downstream of where the washer discharges, is there anything I can do to prevent the kitchen sink drainage from coming out the washer's standpipe?
Any clogs will come up in the lowest open point in your basement, (floor drain, Laundry tub, etc.). There's nothing you can do to prevent that from happening.
(4)Where else must I vent and can I use a "studer" vent? Starting from the top, I'll have the kitchen sink and d/w joined together then going through a trap. This line will extend to the basement where its diameter grows to whatever size the washer needs, then connects into the main "stack". Along this line the washing machine discharge and laundry tub (each separately trapped) join up.
Every fixture that has a trap MUST be vented. Studor Spring Loaded Mechanical Vents are acceptable if local codes permit. If you move the kitchen sink and tie it into the W/M and laundry tray then the kitchen sink must also be vented. You may tie the washer and the laundry tray vent together and revent the two back into a dry vent at least 6" over the flood rim of the highest fixture that vent services.
Hope this helps. Regards, Tom

Tom,

Thanks very much for your detailed response! It definitely helps me out in planning this project.

I sure hope I find local code allows me to use Studor vents, because trying to figure out how to run a traditional vent line will be a trick. :)

Thanks,

-- Matt