Kitchen Remodel Help

[Christopher Wilhite]

The new kitchen sink will be centered on the middle window. The vent stack is located in the far right corner of the photo about 6 feet from where the sink will go. Because the new windows are taller than the old windows, I cannot get the vent pipe on a horizontal run that is at least 6" above the sink lid. How can I vent the new sink per code?

 

[Terry]

You may want to go with an AAV on that one.
A lot of the new construction here is going that way on kitchen sinks. Make is accessible under the kitchen sink for replacement.
The other old school way would be an Island Vent with a foot vent to a place that will go up.

How most are done.

 

[Sponsor]

 

[Christopher Wilhite]

You may want to go with an AAV on that one.
A lot of the new construction here is going that way on kitchen sinks. Make is accessible under the kitchen sink for replacement.
The other old school way would be an Island Vent with a foot vent to a place that will go up.

I think I've heard that called a chicago vent. It's a 45 elbow, 90 elbow, another 45 elbow then down to the crawl space, like you would vent an island. I'm willing to do that as a last resort. Can I 45 degree from the trap and then tie into the vent stack 42" above the subfloor?

 

[Terry]

 

[Reach4]

I'm willing to do that as a last resort.

You have not said how far it is from the sink drain to the corner of the window.

 

[hj]

I have installed the tee a low as is practical, then used a 60 degree elbow to run the vent on an angle till it clears the window.

 

[Christopher Wilhite]

You have not said how far it is from the sink drain to the corner of the window.

From the center of the sink to the farthest window on the right, the horizontal distance is 33.5". The vertical distance from the subfloor to the bottom of the window sill is about 38"

 

[Reach4]

A 2 inch trap arm in Calif can go 60 inches. 1-1/2 can go 42 inches.

http://www.iapmo.org/California Plumbing Code/Chapter 10.pdf

I don't know what happens if you go 12 inches in 1.5 to a trap adapter, and then turn and expand to 2 inches in the wall.

 

[Christopher Wilhite]

Thanks. Well the trap arm would be 6 feet long, so according to the code, 3" pipe? I would not have any stud left to carry the wall load. Does two 1.5" pipes side by side count as a 3" trap arm pipe? Probably not, but it sounds awesome.

 

[Reach4]

Thanks. Well the trap arm would be 6 feet long, so according to the code, 3" pipe?

Why 6 ft? Once it hits the vent, it is no longer a trap arm. See my drawing above.

Maybe get few more inches with the drain on the right.

Hang a garbage disposal, and let the trap be off to the right. Use a cabinet that will not stop that from happening.

I wonder if my drawing suggesting a wye with a 45 leg is OK, now that I think of it. A vent fitting would normally be tilted the other way. I suspect there is a similar solution that meets objections and objectives. I am not a plumber.

 

[Christopher Wilhite]

Why 6 ft? Once it hits the vent, it is no longer a trap arm. See my drawing above.

Maybe get few more inches with the drain on the right.

Hang a garbage disposal, and let the trap be off to the right. Use a cabinet that will not stop that from happening.

I wonder if my drawing suggesting a wye with a 45 leg is OK, now that I think of it. A vent fitting would normally be tilted the other way. I suspect there is a similar solution that meets objections and objectives. I am not a plumber.

Maybe this simple sketch will help illustrate the situation. The vent used to run beneath the old window 6" above the sink. I cannot do that now because the bottom of the windows are lower so the vent would only be 2" or 3" above the sink if ran horizontally. I think the easiest way is start the vent (in the wall) above the P-trap and run it diagonally under the windows with waste fittings until I reach the 42" elevation. I have no idea if this will prevent siphoning though.

 

[Reach4]

Is the stack in your drawing venting anything in the basement?

 

[Christopher Wilhite]

Is the stack in your drawing venting anything in the basement?

No. There is no basement. Only an 18" crawl space.

 

[Reach4]

No. There is no basement. Only an 18" crawl space.

So what about using the "stack" below the vent as a drain? You could block the current drain.

I suspect your drawing was not quite the way it used to be, because the vent should be attached after the output part of the trap.

Terry's ideas are the best. But you have options.