Outdoor Sink Tied to Kitchen drain
Okay… I need some advice. I have designed a backyard grill island, with a simple sink (just cold water, no disposal). In my drawings to the city, i showed my sink draining at a proper grade of 1/4″ per foot from the outdoor sink, to the drain line in an exterior wall of the kitchen (kitchen sink faces out). City approved plans, etc. I call out a plumber (who I’ll say right now didn’t win over my confidence, but he was a referral). He tells me its impossible to tap into the drain going from the kitchen sink because its encased in the concrete. My understanding is that it pokes out from under the foundation, and then heads to the street. in my drawings thats how i depicted it, and the city (who rejected me several times for other stuff) didn’t say a thing about that.
SO, my question is… who is more likely to be right? Me and my plans, or the plumber? Do I just need to start digging and verify for myself?
oh, BTW – his solution was to run the drain about 75′ or so to the side of the house, break up some sidewalk, and tap into a cleanout from an upstairs bathroom. huh?
thanks for the help!
-mike.
Edited 7/21/2006 4:16 pm ET by MichaelJacob
Replies
Details?
House construction - SOG, crawlspace, basement?
"oh, BTW - his solution was to run the drain about 75' or so to the side of the house, break up some sidewalk, and tap into a cleanout from an upstairs bathroom. huh?"
Unless you have a lot of slope then the upstairs bathroom would be well above the sink.
" My understanding is that it pokes out from under the foundation, and then heads to the street."
Why do you think that. Typically the drains connect together at some poin in the house and then run outside. But where? It depends on many things. Where is the main stack? Is there a cleanout at that point? From that you can at least see what direction the pipe starts out heading. But you never know. In my case the kitchen sink is on the south central part of the house. All of the other plumbing is in the north central part of the house. So there is a drain line from the sink to the main line. But when the foundaion was poured someone read the plans backwards so the discharge from the main stack runs to the south west corner where it turns, with a cleanout under the carpet, and exists.
Now if there has been additions there well may be multiple places where drains exit the house.
" He tells me its impossible to tap into the drain going from the kitchen sink because its encased in the concrete. "
Typically any concrete would only extend a short distance.
What is the frost depth? What is the sewer depth if you have any idea?
Seems like a little diggin might be appropriate.
Are you trying to tap into the vertical section of the sink drain? Or into the main line?
If the vertical, wouldn't you remove the tee and replace it with a cross?
I assume you're on a slab.
yeah, on a slab, and i was thinking of just T-jointing into the vertical below the foundation.
"yeah, on a slab, and i was thinking of just T-jointing into the vertical below the foundation."Depending on the location and design you might have a full frost wall foundation or turned down edge on the slab.You might need to go down 18" or more to get to the pipe on the vertical.And my house is slab with frost walls. I am not sure of the details, but IIRC the vertical part is inside the foundation and under the slab. Certainly a difficult place to tie into.I though that you wanted to tie into the line AFTER it exited the house.
southern california.... whats frost? :-)