Re: 4" sewer main, can my vent stack be reduced to 3"?
Posted by hj on February 28, 2004 at 19:02:57:
In response to Re: 4" sewer main, can my vent stack be reduced to 3"?
There are several "ifs" that determine the answer. If your code requires a full sized vent throught the roof, then no. If the code requires that the total area of the vents through the roof equal the area of the 4" main, then NO, unless you have additional vents to compensate for the difference.

: I am in the middle of a remodel/addition. I ripped out all my cast/lead/galv pipe and am going all PVC. My main stack was 4" cast. I put a tyseal in and converted it to 4" PVC. Then in order to jog the pipes the way the short sections of cast were, I used two 22 degree 3" fittings...thus reducint my vent stack to 3". Is that illegal? I read somewhere if you have 4" sewer, you have to have a 4" vent stack. But I also read that a 3" vent will support something like 100 units? I will only have two baths and a kitchen.

: Thanks,
: Rob




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