vent sizing

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67MIke

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Looking to get my ducks in a row. I have tried to read the archives, but still a little fuzzy on some things.
What would my vent size need to be for a commode, one lav, a clothes washer and sink/dishwasher
I was reading where it is 1/2 of your main line, so .. using a 3" would be 1.5.I planned on using a 2" thew the roof good or do I need bigger.
Planned on using my vent lint from the toilet and tying in everything
to that... Thanks Mike
 

hj

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vent

The size you need depends on your code. Some areas would require a 3" vent, others would need two 2" and one 1 1/2", others MIGHT get by with a single 2". I am not sure if anywhere would approve a single 1 1/2" if it were the only vent.
 
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