ICC Code Vent Table

paul32_2009

17 years ago

Hi all. I have the 2003 ICC plumbing code book and I am wondering how to interpret Table 916.1, about vent sizes. Where it says "Diameter of Soil or Waste Stack", does that mean (or could it mean) the trap size? For example, I have a 4" branch/main line running under my kitchen floor, parallel with my floor joists. I would like to put a 2" line to serve the kitchen sink's 1 1/2" trap (maybe 2" if they exist, I haven't studied this yet). I will also have a garbage disposal and dishwasher here too. I would like to use 1 1/2" PVC for my vent (that's all that will fit in my wall because of the way the I joists are situated). I have touched on some of this in another post somewhere.

Anyway, in the ICC, if I look at 2" under "Diameter of Soil or Waste Stack", I see that I can go either 75 or 50 feet with a 1 1/2" vent, with 12 or 20 DFU respectively. Should I be looking at the 1 1/2" row/column (because of the trap size)? And I suppose it just wouldn't make any sense to look at the 4" row.

Thanks in advance. Hope to talk to someone soon. :-)

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Comments (4)

manhattan42
17 years ago
If you are using Table 916.1 for a residential kitchen, you are using the wrong Code and Code Book.

Table 916.1 is from the International Plumbing Code, which is the commercial plumbing code where adopted. It does not apply to residential (1&2 family dwelling and townhouse) plumbing.

You should probably be looking in Chapters 30 and 31 of the International Residential Code regarding sanitary waste and vents and Chapter 27 regarding plumbing fixtures and minimum drain sizes.

What you are probably looking for is
paul32_2009
Original Author
17 years ago
OK. Too many codes. They should have called it the International Commercial Plumbing Code then. I'll look in the IRC. Thanks.
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paul32_2009
Original Author
17 years ago
Why isn't called the International Commercial Plumbing Code then? :-) Section P3113 of the IRC has no chart for developed length like the IPC does. I guess, reading it, is just no less than half the size of the drain served and not less than 1 1/4", on vents less than 40 feet. Maybe it's so simple it doesn't need a chart.
paul32_2009
Original Author
17 years ago
That was like a double post. Sorry, it didn't show my first message to me...I think. Weird.