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Installing Utility Sink In Laundry Room - Main Floor

48K views 13 replies 5 participants last post by  pieman312 
#1 ·
I am trying to install a utility sink in my laundry room.
The home is a single story ranch on a slab - no crawl.
I am wanting to tap into the washing machine drain.
Should I tap into vent past the trap or should i connect
the drain directly into the 2" pipe directly from the washer drain?
I have been able to locate both pipes so just concerned as to
which one would be correct for connecting into or if neither should
be used.:thumbsup:
 
#2 ·
The safest thing to do would be connect it into the vent ABOVE the washer. If its below then when the washer runs out the pipe may get filled with water causing negitive pressure (Vaccume) as it passes the sink drain. This will cause the air to want to come in from the sink drain through the sinks trap. this would suck the water out the trap allowing sewer gas to enter through to the house.
 
#4 ·
Thanks to both for responding
I was planning on putting a trap in the sink drain before tapping into either pipe. By doing this, could i then tap directly into the vent pipe and keep any sewer gas out....this would then eliminate need for venting the sink drain?
 
#8 ·
as defined in the upc you you can.
the washer on the botom. 2" then continue the 2" up the the laundry sink tee. this portion is the wet vent. sizeing is my min drain required. and up size 1 size . required 1 1/2 witch makes the wet went 2"

section of the upc 908.1 and 908.2 and table 7-3
 
#10 ·
Good suggestion from Marlin and nice picture...or drawing, because I don't know what I pictured before but it wasn't that even though what I said still stands I will add to it.. You do not want to tie into the 2" standpipe...(plumbing code aside) not that it wouldn't work but every time you ran the sink you will hear the sound of water pouring into the trap...and again not that it wouldn't work but the vent should be 2" also if you want to tie a sink drain into it with a 1 1/2" arm to the sink trap. There is a certain distance (can't remember off the top of my head and don't have code book handy) that you can run the 1 1/2 arm to the trap without a vent.....the section between the the two sanitary tees on the vent will then be wet vented but it will beat breaking into the slab. I would also put a clean out into the vent in addition to the tee for the sink drain.
 
#13 · (Edited)
I edited your picture to show what I think is the best way to tie this in. The red section may or may not be necessary depending on how far from the stack the sink will be. I've always used 24" as a rule but have never actually seen the code.
The second fitting I added on the stack is called a tee-wye, anything below that second tee-wye needs to be 2" or larger. Anything above it is should still be ok with 1-1/2. Your local code will dictate if you are allowed to use that red tee why I have on it's side right after the trap. If you can't use it simply replace it with a wye and a 45.
The red pipe should be 1 1/2
As for the height to tie that red line into use 48" as my rule and it doesn't hurt anything to be too high. You need to be 6" above the sink or higher why tieing in that red line as a minimum.
 

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