Utility sink add
#1
04-29-17, 10:15 AM
Utility sink add
I want to add a utility sink on the ground level of an elevated house in a utility room that already has a washing machine. The washing machine has a traditional 2" standpipe then trap then ties into a 4" vertical DW stack. Above it, on the main floor 2 bathrooms totalling 14 DFU's are also using this DW stack, all properly dry vented. Can I install the utility sink which will be approximately 2' from the 4" vertical as a wet vent unit? Tie in above the washing machine? This is on an exterior, insulated wall (the living floor, the utility is open studs) so dry venting access would be difficult. There is also a toilet on this floor that ties into this DW stack below the ground, then the stack turns horizontal and goes to the street, but on the way picks up another 4" vertical DW serving fixtures totaling 9 DFU's. Maybe too much info but I want to get this right.
#2
04-29-17, 11:18 AM
Super Moderator
No you cannot wet vent. You would need to cut into the wall typically.
But I cant see the set up. What I do to save from demolition is to pipe the sink to the laundry trap then discharge the laundry into the sink..
Otherwise you need to cut in wall and do this..
[ATTACH=CONFIG]80223[/ATTACH]
But I cant see the set up. What I do to save from demolition is to pipe the sink to the laundry trap then discharge the laundry into the sink..
Otherwise you need to cut in wall and do this..
[ATTACH=CONFIG]80223[/ATTACH]
#3
04-29-17, 01:05 PM
Thanks, but...
No need to cut into the wall the lower level is open studs, all piping exposed. It is the upper level I can't get through to get above that floor's fixtures into the attic for a true dry vent. Don't want to drain the washer into the sink. Confused. second sketch is what I want to do. But the two horizontals are 2" from the washer and 1-1/2" from the sink. The center is a 4" primary DWV. Is that not considered a permissible wet vent given that although the 4" DWV is used for fixtures on the main floor above it is not even close to it's DFU capacity.
#5
04-29-17, 01:37 PM
Super Moderator
The washer as it is now, if the stand pipe just connects to the 4" without a vent is not to code. As you state drainage flows down that 4"..
Im just telling you code. Its your house you can do what you want.
Without proper venting traps siphon and dangerous sewer gas gets released in the home. High concentrations make you sick or dead!!!..
Im just telling you code. Its your house you can do what you want.
Without proper venting traps siphon and dangerous sewer gas gets released in the home. High concentrations make you sick or dead!!!..
#6
04-30-17, 05:24 AM
The washer as it is now is just that an open standpipe for the washers drain, a trap, then a direct connection to the 4"DWV which does drain a total of 14 DFU's worth of fixtures on the floor above it. It has been that way for 18 years, inspected by the code enforcement folks when new construction and, because it is in short term rental service, inspected every three years for license renewal. And they do look at plumbing issues, we have had to make some changes. There is no hiding the washers status, it is visible because it is in open studs.
However, when I put in the utility sink, I may use a side wall vent, think I can get it to meet requirements, appropriate distance up, appropriate distance away from any next floor windows and appropriate distance from property line. That will let me penetrate the open stud, uninsulated wall without having to go through the finished section. If not that, an AAV as the last choice. I'm not, under any circumstances, going to tear out the finished second floor to get this done.
No pic possible at this time, the site is 400 miles away.
However, when I put in the utility sink, I may use a side wall vent, think I can get it to meet requirements, appropriate distance up, appropriate distance away from any next floor windows and appropriate distance from property line. That will let me penetrate the open stud, uninsulated wall without having to go through the finished section. If not that, an AAV as the last choice. I'm not, under any circumstances, going to tear out the finished second floor to get this done.
No pic possible at this time, the site is 400 miles away.
