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Author:
Rick A. (MD)
Hi Everyone,
New 1st time homeowner who just bought a 100 yr old house that has lots of previous DIY repairs by the looks of things.
Short story is I need to install a washing machine. There is a utility sink in the basement, but its on the other side of the room from where the washer is going (and shares a drain branch with the kitchen sink / dishwasher). That line eventually goes through the kitchen and out the roof as an auxiliary vent, but as a wet vent, and there is not a separate vent line on the utility or kitchen sinks.
So since all that is happening over there, and I want to washer on the other side anyway, I am not tying into that drain and adding a new line.
Attached is what I have laid out so far. Everything is 2", except the vent line which is 1.5".
Links to the Pictures:
[drive.google.com]
[drive.google.com]
My main concern is splicing it into the stack. I am confused about the max trap height. Multiple diagrams have the height being measured from different places (bottom of the trap, bottom of the pipe leaving the trap, center of the pipe leaving the trap, etc.) What is customary?
I will need to add the 3x3x2 S-Tee to the stack, and raise/replace the current cleanout. I am near the max height of the trap by having to add the new Sanitary Tee above the current one that drains the kitchen line. Is it okay to just add it directly over the current Sanitary Tee, or could I even replace it with a Double Tee and connect both drains to the stack that way? It's only about a 5' run, so it doesn't have to slope much, but I want to make sure that there isn't an issue with the height off the ground.
Coming off the drain is a 1.5" vent pipe. I will put a temp Studer valve on there after raising the height of the vent line to above the top of the standpipe. I will eventually tie it into the main vent system to the house, but I need a temp fix the get laundry going and figured it should work in the short term.
Is this right? Very new at this and any suggestions are greatly appreciated.
Thanks
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Author:
North Carolina Plumber (NC)
Here in NC the standpipe out of the trap has to be at least 24". The top of the standpipe has to be at least 34" from the floor. You can put your trap as high as needed.
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Author:
Rick A. (MD)
Thanks for the response. Okay, so the trap height is good then. It it okay to stack those 2 S-Tee's and the cleanout all on top of each other like that? And I know AAV's are a point on contention, but should it suffice in the short term to just work with the washer?
Thanks
Edited 1 times.
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Author:
packy (MA)
AAV's work to relieve negative pressure by allowing air into the system but will not allow air out. when the washer discharges it will create a positive pressure ahead of the discharge. you may be close enough to the main stack that the pressure will go up it.
when you talk about where to measure the height of the trap from the floor, the center of the outlet is where to measure to.
stacking 2 san tees is fine..
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