Plumbing question,

Jay87T

Member
I know its off topic, but who better than to ask you guys, Im roughing in my basement and I got a question. Im on a septic system, and I have to put in a sewage pit with pump to pump it up to the drainage pipe going to the septic tank, Im adding a washroom wich will be 4-5 feet from the new sewage pit Im putting in the basement. Im adding in a drain for a vanity, toilet, and bathtub. Question I have is, Do I need venting on this being so close to the sewage pit? I see there is a 2" vent that comes from the pit it self. Do I need more?
 
Technically, and probably also by code, you do. Without venting on the upstream side of the flow, your sink and toilet will drain very slowly. A run of drainage that vents at the destination is sometimes called a "wet vent". It might not be terrible, but you probably won't like it. You might be able to use a vent which terminates in the wall and has a one way valve at the top to keep waste water or sewage from running out there if the drain backs up.


To me, this subject is not off topic.

Stan
 
That's the thing, although a quick internet search showed that units made by reputable manufacturers (like Oatey) can be purchased for a fraction of that price.

Stan
 
Its a new house and I know of a vent I can T off into in the basement going to the roof, its the vent for the floor drains in the basement. If I Just T off the vent to the vanity sink is that enough? pitcure a bathroom with a sink toilet and bathtub all in a row. and a 3" drain from the sewage pit.
 
If I was to advise on specifics, I'd be guessing, I'm sorry to say. I've done lots of most kinds of plumbing, but only occasionally as a job in itself. Most of my experience has been with the plumbing as part of a larger remodel, so I don't have the depth of experience that it takes to have the facts and formulas committed to memory as most experienced plumbers do, or used to, anyway. In the last bathroom remodel I did, two years ago, a bath, toilet, and vanity were all vented by 1-1/2" galvanized steel pipe. It had been done that way 60 years earlier by the builder---by the plumbing sub-contractor, more likely---and there had never been a problem with it in the 30 years I've owned that house. I used to have a good deal of faith in the building practices I encountered in houses built before about 1975 when the DIY movement started providing untrained individuals with the opportunity to start doing some truly appalling work. But, you didn't ask about that.

You should be able to find charts or other information online to tell you the size of venting pipe you need to vent different combinations of fixtures. Remember that you need to connect your vent pipe for your basement fixtures above any fixtures higher in the house if you connect to a vent pipe that they use. You don't want your basement fixtures to be the point of overflow for backed up fixtures above them.

Stan
 
I know there are different codes and practices for different areas, but we have to vent every trap. So, every single fixture has to be vented. 2" is the minimum vent for a toilet. That 2" vent will be sufficient for the sink and shower also. Tie all three together. Stan touched on the idea of wet venting. That is the practice of tying a vent from one fixture into the drain of another fixture. That's a big no-no where inspectors are involved. As long as the vent for the floor drains you want to tie into isn't a drain for another fixture/s, you're good. If there's no inspector and you choose to wet vent...it will still work. At least try to use D.W.V. fittings and put them in the right way, and you should be golden.
 
(quoted from post at 11:07:36 01/28/15) I know its off topic, but who better than to ask you guys, Im roughing in my basement and I got a question. Im on a septic system, and I have to put in a sewage pit with pump to pump it up to the drainage pipe going to the septic tank, Im adding a washroom wich will be 4-5 feet from the new sewage pit Im putting in the basement. Im adding in a drain for a vanity, toilet, and bathtub. Question I have is, Do I need venting on this being so close to the sewage pit? I see there is a 2" vent that comes from the pit it self. Do I need more?

Around here it is called back venting. You just run it in the wall or in the first story floor horizontally and tee into the nearest vent stack.
 
You could try it but I think it would still be trying to suck the water out of the traps and have that fun sound that goes with it.
 
Each fixture needs to be individual vented but you can tie them together after you get 6" above the flood rim of the highest fixture, Sump pit needs to be individual vented thru the roof. Anyway that was per the last International Plumbing code I looked at, your city/county may have different requirements, any below grade vent has to take off above the centerline of the waste pipe it connects to.
 

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