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Old 12-03-2010, 01:47 PM   #1
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Can I avoid the revent?


I'm in the process of redoing my kitchen, and the placement of the kitchen sink, which lies below a casement window, is giving me a hard time figuring out how to lay the plumbing for it. I would prefer not to cut into any studs around this area, since that would mean cutting into studs that are supporting the header of the window, which belongs to a load bearing exterior wall. I can't use AAV's in my area, nor can I use loop vents, which are meant for islands. So initially, I was stuck with doing a rather painful revent to the adjacent wall which contains the main soil stack, which would mean cutting into some joists, which I also would prefer not to do.

So I was reading the 2009 National Standard Plumbing Code from the PHCC which is what the NJ Uniform Construction Code Act follows, and that, in turn, applies to my town, and I found these sections under Chapter 12:

I bolded the areas which I think apply to my questions below.

12.8 FIXTURE VENTS

12.8.1 Venting of Fixture Drains
Fixture drains shall have a vent so located that the vent connects above the top weir of the trap and the developed
length of the trap arm is within the limits set forth in Table 12.8.1.
EXCEPTIONS:
(1) Water closets and similar siphonic  xtures.
(2) Combination waste and vent systems. (see Section 12.17)
(3) Vents may be connected below the top weir of the fixture trap if the following conditions are met:
a) The vertical section of the drain pipe shall be at least one pipe size larger than the trap inlet size.
b) The horizontal pipe connected to the trap outlet shall be at least two pipe diameters long.
c) The developed length of the trap arm shall not exceed the values in Table 12.8.1.

Table 12.8.1
MAXIMUM LENGTH OF TRAP ARM
Size of Trap Arm (Inches) Length Trap Arm to Vent Slope Inches per Foot
1- 1/4 - 3 6" - 1/4
1-1/2 - 5 - 1/4
2 - 8 - 1/4
3 - 10 - 1/8
4 - 12 - 1/8

NOTES FOR TABLE 12.8.1:
This table has been expanded in the "length" requirements to reflect expanded application of the wet venting
principles. Slope shall not exceed 1/4" per foot.


12.12 FIXTURE REVENTING

12.12.2 Horizontal Branches
Three lavatories or one sink within 8 feet developed length of a main vented line my be installed on a 2" horizontal
waste branch without reventing, provided the branch is not less than 2 inches in diameter throughout it's length
and provided the wastes are connected into the side of the branch and the branch leads to its stack connection with a
grade of not more than 1/4 inch per foot.


The proximity of the kitchen sink to the main soil stack is way less than 8 feet. I also have two secondary vent/drain vertical stacks that are 2" diameter that lie on the same wall as the main stack line, not far from it.


So I have the following questions:

1) Does the above code imply that I may be able to simply connect the sink drain to the main soil stack or any of the secondary lines without creating a revent for the sink if I simply follow the size and diameter dimensions for the horizontal branch?

2) Would it also be possible to run this horizontal branch that connects the sink drain to any of the vertical stacks on the adjacent wall (main soil, or the 2 secondary 2" ones) below the kitchen floor? My basement lies directly below the kitchen floor. This way I won't need to alter any walls in the kitchen for this connection.

3) What size will the trap for the sink be required to be if this horizontal branch has to be 2"? In other words can the trap stay 1 1/2", but convert to 2" once you're at the top weir of the trap?

Thank You,
Amado

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