Vent pipe sizing

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Old 01-04-09, 10:13 AM
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Vent pipe sizing

Hi all,

Quick and easy question for you. I am designing the plumbing system for a small remodel and cannot find drainage unit values for a Washing machine.

I have a sink, shower and washing machine sharing a vent pipe. Each will have 1 1/2 inch lines to where they all connect together, but can I get away with 1 1/2 inch all the way to the main vent stack?

The main connection is only about 12 feet away (5 vertical, 7 Horizontal).

Thanks

(toilet is on a separate vent)
 
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Old 01-05-09, 11:55 PM
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Those vents would tie together into a 2", and 42" or more above the floor.
 
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Old 01-06-09, 03:59 AM
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Hi Justin,

According to my info, which is IPC 2006, you will need a 2" drain for those 3 items with a total of 5 DFU's. (w/m = 2 dfu's) with a minimum vent of 1 1/2".
All vents must be a minimum of 1/2 the diameter of the drain it serves.

Remember, I do not know the code book you go by, so if you are unsure, call your local town building official.
 
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Old 01-08-09, 10:08 PM
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Oops, Plumbing gods is correct (and I was incorrect). UPC allows 8 FU on an 1" vent. The 42" tie-in point, however, was correct.
 
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