I live in an old house and the plumbing is not up-to-code. Every single sink in my house has an S-trap. The easiest one to fix is the kitchen sink and I am trying to figure out the best way to go about doing so.
The old configuration was a mess (the garbage disposal did not drain well- and got to the point that I had to reach my hand in and push stuff around to get it to drain-- the disposal itself would no longer turn and was rusted):
Because it was already S-trapped and there was no available outlet through the wall for a vent (and I needed to get this fixed asap since the sink had been out of commission and dishes were piled up), I'm temporarily using this setup:
I then started thinking of how to configure it so that I could get it vented properly (AAVs are NOT allowed in my state so that option was out). I came up with this crappy rough sketch.
After looking up some parts I started to get a better idea of what I could do. I figured I could use a compression to PVC fitting to bridge it to a 1 1/2" sanitary tee that takes it down to 1 1/2" to 3" (or 2" if it turns out that is the pipe size under the house) wye to hook up to the existing pipe that has a cleanout and on top of the tee I would have an elbow to take the pipe out through the wall at an angle (so it would not be a flat vent) and another elbow to make it go up outside the exterior of the wall.
(obviously that is not to scale)
My next hurdle is the window above the sink. As you can see in this photo, the existing vent pipe routes around the window. I'm not sure if it is actually 6 inches above the flood level and this terminates under the soffit.
Currently the sink drains to a pipe under the house and then comes out from under the house (flat vent) and then back up along the exterior wall. I know that isn't to code. So, once outside the house I would need to route it around without having it go flat/horizontal before the 6" mark. I'm thinking another elbow or something and trying to get it to start going sideways at an earlier point with another elbow. I'm just not sure how to measure for the angles and where all of the holes should be. I am not thrilled with drilling through the siding, but I don't want to tear up the backsplash above the sink. (I don't care about the look under the sink).
Is the configuration in my last sketch OK? Should I make any changes?
How should I seal around the pipe that is going through the wall?
Any advice?
The old configuration was a mess (the garbage disposal did not drain well- and got to the point that I had to reach my hand in and push stuff around to get it to drain-- the disposal itself would no longer turn and was rusted):
Because it was already S-trapped and there was no available outlet through the wall for a vent (and I needed to get this fixed asap since the sink had been out of commission and dishes were piled up), I'm temporarily using this setup:
I then started thinking of how to configure it so that I could get it vented properly (AAVs are NOT allowed in my state so that option was out). I came up with this crappy rough sketch.
After looking up some parts I started to get a better idea of what I could do. I figured I could use a compression to PVC fitting to bridge it to a 1 1/2" sanitary tee that takes it down to 1 1/2" to 3" (or 2" if it turns out that is the pipe size under the house) wye to hook up to the existing pipe that has a cleanout and on top of the tee I would have an elbow to take the pipe out through the wall at an angle (so it would not be a flat vent) and another elbow to make it go up outside the exterior of the wall.
(obviously that is not to scale)
My next hurdle is the window above the sink. As you can see in this photo, the existing vent pipe routes around the window. I'm not sure if it is actually 6 inches above the flood level and this terminates under the soffit.
Currently the sink drains to a pipe under the house and then comes out from under the house (flat vent) and then back up along the exterior wall. I know that isn't to code. So, once outside the house I would need to route it around without having it go flat/horizontal before the 6" mark. I'm thinking another elbow or something and trying to get it to start going sideways at an earlier point with another elbow. I'm just not sure how to measure for the angles and where all of the holes should be. I am not thrilled with drilling through the siding, but I don't want to tear up the backsplash above the sink. (I don't care about the look under the sink).
Is the configuration in my last sketch OK? Should I make any changes?
How should I seal around the pipe that is going through the wall?
Any advice?