Plumbing and venting in the basement for a bathroom?

Question

would like to add a bathroom in the basement. The problem is there is not vent stub out. I plan in putting in a sink, tub, and toilet. I also plan on having a utility sink and a bar sink. These are on the oppisite side of the house. There is a vent that is attached to the upstairs tolet that is accessable. But, I don't think I can use that because the toilet upstairs is above all the sinks downstairs. Also, it is about 30-40 feet away from the basement bathroom. What I was thinking of doing is putting another vent NEXT to the vent that is attached to the upstairs toilet. Then connecting the basement with the upstairs toilet vent in the attic. The vent in the attic is a 4 in stack that goes to the roof. The upstairs toilet attaches to that. Am, I on the right track? The basement is pre-stubbed.

Answer 1

If the openings were installed when the house was built there should be a vent installed for them. If there isn't there are 2 possible reasons why. 1) bad job of roughing it in or 2) at the time they were installed they were considered vented because of their location from a main vented line. In either case, save yourself some grief and forget running the vent pipe and just install studor vents, air admittance valves, inline vents. (whatever you prefer to call them by) on the bathroom sink, the bar sink, and the utility sink.

They are approved, although not my favorite option, in some cases they are a decent alternative and will work for what you are trying to accomplish. When you put the sinks in, the riser that comes out of the concrete, put a tee on that riser. Out of the top of the tee put another riser as high as you can get it under the cabinet/sink and put the vent on top. They are about $20 apiece but well worth it. Basically what they do is allow air in the line when needed and seal up when it isn't.

I would also dig around a little more and make sure you don't have a vent hidden behind the insulation in the bond or the ceiling somewhere. If I install rough openings in a basement, I add a vent, always.

Answer 2

Bathroom Plumbing Venting

Answer 3

You don't really need to run all the way to the attic. Since I'm assuming you are going to have to open a wall to run the vent anyway, you only need to go up to the vent that services your bath above - located close to the sink in that bath. Put in a sanitary tee up side down on the line (1 1/2" to 4") and tie your pipe in there 42" or more off the floor.

Because of the distance you need to run across the basement, check you local plumbing code. You should be able to call the inspection office and ask if you can use an in line vent, air admittance valve or automatic vent. These are installed at the end of a piece of pipe above the flood rim of your fixtures and would save you many hours of running pipe and they are legal in many areas for venting (like an island sink or captive bath in a basement). Home stores have them. If you are not getting it inspected this would definitely be the way to go.

If you have any more questions give me a click and I can instruct you further.

Good Luck!

Answer 4

You are just fine with your thoughts, however, it is not necessary to run the vent to the attic as a 3 inch pipe, You only need a 1 1/2 inch pipe to the attic. In the attic, you can use a clamp on rubber gasketed male fitting that will make it un-necessary to cut the stack.

Answer 5

yes it will work, but to prevent the extra piping you could allways just run a seperate vent out the basement wall with the top above the comon snow level and a snorcle top with a screen cap on the end

Answer 6

Before you listen to anyone here, consult your local municipalities plumbing inspector. He can save you plenty of time and do the work to code.