Kitchen vent question

street ell

street ell

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I have installed new cabinets and have moved the kitchen sink about 2 feet so that it is centered under the kitchen window. The reason the sink wasn't centered was because they ran the drain and vent up the side of the window.

What I would like to do is reconnect the sink drain to the original vent by running the drain through the floor and then once under the floor (where there is basement access) and the drain begins to run horizontally I would connect the vent and send the vent pipe back over to the original pipe. I believe that I have to keep the vent at 45 degrees or better while under the spill line.

The easier thing to do would be an AAD, but I would prefer the atmospheric vent if I can manage it. The only thing on this vent and drain are a two bowl kitchen sink and a dishwasher so I think I can use a 1 1/2 inch pipe for the vent.

What are the problems with this idea? Thanks for your help.
 
I'm not really sure what you're proposing here, the trap should be under the sink in the cabinet, not under the floor...

You just need a longer trap arm to reach under the window...
 
The vent connection cannot be below the trap. As the other post said, the easiest thing to do is run the trap arm at proper pitch across to where the connection can be made properly with a sani-tee.
 
Yes, I will put the trap under the sink but instead of a trap arm which would have to go through the next cabinet box, I thought it would be easier and better to just head through the floor and toward the drain. The only problem is now getting the vent reestablished. I would like to not drill through the next cabinet box because it is full of drawers not shelves.

Sorry if I haven't explained the problem very clearly.
 
The vent connection cannot be below the trap. As the other post said, the easiest thing to do is run the trap arm at proper pitch across to where the connection can be made properly with a sani-tee.[/QUOTE]
 
The horizontal pipe will ideally be IN the wall but can run along the very back of the cabinet. The vent cannot be below the trap.
 
What you're proposing might be "easier" in your mind, but you will not be properly venting the fixture... you'll also be creating an s-trap...
 
OK so if the vent has to be at the proper pitch above the trap I don't think I can get all that done. It would have to be a horizontal vent and I don't think that is allowed So I would have to use an AAD.
 
cacher_chick said:
The horizontal pipe will ideally be IN the wall but can run along the very back of the cabinet. The vent cannot be below the trap.
Click to expand...

I disagree about the horizontal pipe being INSIDE the wall, this requires cutting into the jack and king studs that support the header above the window, exterior walls are load bearing walls.
 
street ell said:
OK so if the vent has to be at the proper pitch above the trap I don't think I can get all that done. It would have to be a horizontal vent and I don't think that is allowed So I would have to use an AAD.
Click to expand...

The vent wont have any pitch at all, the vent is the vertical pipe ABOVE the santee, the TRAP ARM will have proper pitch towards the santee, below the santee is the drain...

AAD? You mean AAV.

1,000,000s of kitchen sinks are in use, vented properly and have windows above them... An AAV isn't required here.
 
That is correct. The reason why the plumbing was originally installed this way was to protect the framing. I can't put this in the wall without compromising the 2x4 framing. You guys are very helpful and fast too. Am I correct to think that you can't have a horizontal vent line below the spill line of the sink? It is sounding like this is a job for an AAD.
 
Now you are confused. :o)

The drain pipe and/or trap arm runs horizontally (with pitch) from the trap to the vertical pipe in the wall. The same vertical pipe is a vent going up through the roof, and a drain going down through the floor.
 
street ell said:
That is correct. The reason why the plumbing was originally installed this way was to protect the framing. I can't put this in the wall without compromising the 2x4 framing. You guys are very helpful and fast too. Am I correct to think that you can't have a horizontal vent line below the spill line of the sink? It is sounding like this is a job for an AAD.
Click to expand...

I think you're using the wrong term here...

ptrap_install.jpg
 
I see what you are saying about the arm and the vent. Yes, I mean AAV I thought it was D for device instead of V for vent
 
Either way, they're a mechanical device with moving parts (will fail eventually), a proper vent will not.
 
He didn't tell us how the home was constructed, but I see lots of homes with 1-1/2" pipe running through the load bearing wall.

If the cabinets are already in, running a trap arm along the very back of the cabinet to the stack is the way to go. If the one drawer is in the way, the depth of the drawer can be reduced appropriately to fit.
 
The drain should be in the wall coming up next to the window. Cut in the san tee so it will finish off about 15" OFF, with slope to the drain. It is OK to drill through the jack stud.
 
Please beware, none of the people recommending you remove almost all of the meat from the middle of a jack stud are structural engineers, and no engineer would ever sign off on such a thing.

Just because plumbers notch (top and bottoms of) joists and studs all the time doesn't mean it's okay to do so structurally...
 
All the kitchens in the condo where I live have the sink at the window. The waste arm from the trap goes to the side, enters the wall in the rear of an adjacent cabinet, where it finds the waste stack and the vent. Yes, if there were drawers in that cabinet, it would shorten the drawer a few inches. I presume they did it like that because (a) they didn't have to go through the king stud and jack stud, and of course (b) there is a window directly below, so the stacks can't go there!
 
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