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


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

Having settled on a shape for the faucet, you must next decide on a finish. While polished chrome and brass are perennial ... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon