Dave Anderson

02:56AM | 11/25/02
Member Since: 10/23/02
41 lifetime posts
We're adding a second story addition to our home and I have some questions about where to locate the vent. This is on a side of the house that has an exsisting vent right off of a sink directly below the proposed lavitory.

As I understand it, as water flows down the sewer line, it pushes the air out the vent eliminating an air lock.

Therefore, I'm thinking that the vent needs to be located as close as possible to the 4" stack in the basement as I can get. (This is attainable as we just had a new stack put in this summer). However, would the existing vent located off of the first floor sink do the trick since it is located off of the first floor and not the basement?

Secondly, is 1¬Ω" PVC adequate, or does it need to be 2"? This is residental, with a septic system.

Thanks in advance,

Dave Anderson


07:37AM | 11/27/02
Member Since: 11/17/02
50 lifetime posts
Your vent for a bathroom needs to be at least 2" in diameter. You should run a vent up from the fixtures to the roof or to the vent in the attic and re-tie to the existing stack. Each fixture in the bathroom needs to have an individual vent, which is within 42 inches for an 1-1/2 drain, 5 feet for a 2 inch drain and 4 feet of a toilet. The vent is a continuation of the drain line and must run vertically to at least 6 inches above the overflow rim of the fixture it is serving. All vents can tie together before extending up to the roof, much like the branches on a tree. Remember the flow of air needs to run to the roof and so some pitch on horizontal sections is necessary, to keep water from condensing in the pipes and building up. All drain lines must be pitched at 1/4 inch per foot.
Good Luck
Master Plumber
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