Hello:
My son just moved into a new house and has a botch-job of a disposal drain that we need to fix. See pics.
http://s1158.photobucket.com/user/jmulla54/embed/slideshow/Disposal Drain
The problem is that the drain line under the kitchen sink is 3-4" above the disposal outlet. We cannot open up the wall and tap into the drain pipe lower down because the drain runs horizontally (to the right of the sink) behind several cabinets until it joins with the vertical drain/vent stack. The stack is to the right because, as you can see, there is a large window behind the sink. I am 100% sure that there is nothing else draining into this drain from upstairs; there are no bathrooms etc. above the kitchen and the vent pipe goes straight up to a roof vent.
At the other end, the drain line eventually drops down into the basement ceiling and then runs back horizontally to the left and then vertically down where it connects into a drain in the basement floor.
Which of these options would work, meet code and be the easiest:
1) Run the disposal drain straight down through the base of the cabinet and put a p-trap in the basement under the sink cabinet. San tee from the p-trap to the HORIZONTAL section of the drain/vent pipe.
2) Run the disposal drain straight down through the base of the cabinet and in the basement as in #1, move it over about a foot to the left with 45's, then into a p-trap, and finally san tee it into the vertical drain/vent pipe.
3) Use s-trap (I know, I know) inside the cabinet and run it through base of cabinet and then san-tee into the horizontal drain/vent in the basement. Would the S-trap be OK given there is a clear vent less than 3' away (vertically) or would I need an AIV inside the cabinet?
Thanks for your constructive inputs!
My son just moved into a new house and has a botch-job of a disposal drain that we need to fix. See pics.
http://s1158.photobucket.com/user/jmulla54/embed/slideshow/Disposal Drain
The problem is that the drain line under the kitchen sink is 3-4" above the disposal outlet. We cannot open up the wall and tap into the drain pipe lower down because the drain runs horizontally (to the right of the sink) behind several cabinets until it joins with the vertical drain/vent stack. The stack is to the right because, as you can see, there is a large window behind the sink. I am 100% sure that there is nothing else draining into this drain from upstairs; there are no bathrooms etc. above the kitchen and the vent pipe goes straight up to a roof vent.
At the other end, the drain line eventually drops down into the basement ceiling and then runs back horizontally to the left and then vertically down where it connects into a drain in the basement floor.
Which of these options would work, meet code and be the easiest:
1) Run the disposal drain straight down through the base of the cabinet and put a p-trap in the basement under the sink cabinet. San tee from the p-trap to the HORIZONTAL section of the drain/vent pipe.
2) Run the disposal drain straight down through the base of the cabinet and in the basement as in #1, move it over about a foot to the left with 45's, then into a p-trap, and finally san tee it into the vertical drain/vent pipe.
3) Use s-trap (I know, I know) inside the cabinet and run it through base of cabinet and then san-tee into the horizontal drain/vent in the basement. Would the S-trap be OK given there is a clear vent less than 3' away (vertically) or would I need an AIV inside the cabinet?
Thanks for your constructive inputs!
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