I couldn’t find anything about this in the IRC so I thought I’d ask here. I’m moving the kitchen sink about 9′. Where it is now, the vent for it (a 1-1/2″ pipe not tied into the main vent stack) rises straight up, thru the attic and the roof, right behind the sink. When I’m moving it to the new location, the vent will have a horizontal run of about 9′.
Does the horizontal run have to have a slope? Is this ok? When I run the vent pipe into the attic, does it matter that the run is closer to the floor or closer to the roof?
Thanks-
Kevin
Edited 6/9/2005 8:22 am ET by kevreh
Replies
"Does the horizontal run have to have a slope? Is this ok? When I run the vent pipe into the attic, does it matter that the run is closer to the floor or closer to the roof?"
Yes, it has to have a slope. Any water that comes into the vent (rain or condensation) has to be able to run down into the drain system. Otherwise it could pond and shut off the vent.
And the horizontal section can't be below 6" above the flood (corrected) rim of the sink.
http://www.codecheck.com/pg13_14plumbing.html#vents
Edited 6/9/2005 12:07 pm ET by Bill Hartmann
"And the horizontal section can't be below 6" above the floor rim of the sink. "
Or put another way, the horizontal section needs to be at least 6" above the bottom of the sink (?) Sorry my brain isn't 100% this morning.
THANKS!!
Kevin
Kevin, that should have been flood rim.
BTW, why not take your new vent straight up the wall at the new location, and tie it back to the old vent in the attic?
Same rules apply for the slope, but it a lot easier than drilling all those studs and slipping in short pieces of pipe. If there is a window in the way just go horizontal far enough to miss the window, and then go up.
Dave
Ahhh.... the flood rim. I was thinking the bottom of the sink.
The sink will be "behind" a half wall (looking over into the familiy room). We're opening up the floor plan. This will require me to go right about 3' to meet the wall that goes to the ceiling, then over to the existing vent pipe.
BTW, I spent a couple days considering a vent valve. It just seemed like it would be a band-aid of sorts. Thought I'd go with the sure thing versus something that may fail.
Thanks!
Kevin
BTW, I spent a couple days considering a vent valve. It just seemed like it would be a band-aid of sorts. Thought I'd go with the sure thing versus something that may fail.
Our kitchen sink's in front of a low window in a cast concrete wall. Here's what I was allowed to do:PAHS Designer/Builder- Bury it!
That's an option in my case.... any trade-off of a Loop Vent versus the way I was planning?
Kevin
Edited 6/9/2005 4:38 pm ET by kevreh
Not a lot that I can see. I didn't have anything close to tie into and this sure worked very well for me. The reason I mentioned it was your saying you'd looked at the valve vents, which I preferred not to use. Don't remember if our bldg dept even accepted them.
If you have no problem sloping the connection to your old vent, that'll work too. All ties into your thread, which'll likely be read by more than a few. Before doing my kitchen, I didn't know it was an option.PAHS Designer/Builder- Bury it!
"Does the horizontal run have to have a slope? Is this ok?"
my plumber knows the answer ...
I actually know the answer ...
But I'm curious ...
what does your local plumbing/building inspector have to say on the matter?
Jeff
Buck Construction
Artistry In Carpentry
Pittsburgh Pa