I am starting to finish my basement bathroom. When the house was built the basement was plummed for a bathroom. If you are facing the East wall right - left, I have a 2" PVC running vertical(apparently for vanity), toilet drain, 1.5" PVC (unsure, possible toilet or shower vent), cut out and 2" horizontal in cut out for shower drain.

I have a pit with macirating pump(spelled wrong). The pump is going to the drains for the rest of the house and goes into the septic. There is also 1.5" PVC coming out of the pit, which I assume is the vent.

My question is: Can I tie the vanity vent from and the toilet/shower vent together and run them over to tie into the vent for the pit/pump that runs up and out the roof?

I will try and get some pictures if needed. Please Help! I have 11 of wife's family members coming in approx 2 weeks and will need the 3rd bathroom.

I believe you have a SEWAGE EJECTOR PUMP in the pit... yes? Or do you in fact, have a macerator pump.. Pretty rare we see these... but if you do , changes little here, so read on... ;) You should have 2- 2" pipes coming out of the pit (vent should be 2" not 1.5"?? ).

One for the waste, which should have a check valve before going off and connecting into the sewer pipes going to the septic. The other 2" pipe is a vent and that vent needs to go up and out the roof by ITSELF. Plumbing code is quite specific about that, i.e. you cannot connect other vents from the downstairs bath into this vent! Sorry!

The other fixture vents need to connect together and they can run to the future vent in the basement, if present (look for 2" capped vent), or will need to run upstairs to connect into the attic to 2" or larger vent.

That is important here... if you have toilet downstairs then you will need to run the lavatory vent that is 2" now, full size 2" all the way until it ties into the 2" or larger vent in attic or at the 2" future vent in the basement. This 2" lavatory drain line is actually also a WET VENT for the toilet..so must stay 2" all the way.

The 1.5" vent sounds like a vent for the shower and should be connected into the lavatory vent at least SIX INCHES HIGHER than the top of the lavatory sink top itself... then, as stated, 2" runs off as discussed.

Lavatory drain comes off the 2" at 18" to center drain off finished floor.

Let us know if you need more info... MARK

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If this helped please RATE THIS ANSWER. Thank you.

I misstated, the vent pipe out of the pit is 2". Truthfully I am not sure if it is an actual macerator. I know the previous owner said he had the correct pump installed(again, not pertinent here), but you are right on with the configuration. I have hopefully one more question.

I have heard that when venting that there are limitations on horizontal runs. My current vents are on the opposite side of the house. Actually almost opposite side and end of the house from the current basement rough in. Is there a problem with how long the horizontal run is, as long is there is somewhat of a grade for condensation? I would have to make horizontal run of maybe 30' straight shot. The bathroom ceiling is only going to be 8', the basement has 9' joists, so I should be able to put a grade, does this sound like it will work?

I do not see any roughed in vents exsisting for the basement bathroom.

lbcrow:

Pitch is required for all vents... so that niether helps nor hurts horizontal distance requirements.

Sounds like you may be MORE THAN pushing horizontal distance requirements and may want to increase that vent to 3".

Here's what another plumber (iamgrowler) from this site had to say in regard to a similar question on this subject... "On a vent with a developed length of 60 feet, only 20 feet of that run would be allowed to be horizontal -- If the horizontal run exceeds 1/3 of the developed length, then you must increase the pipe size of the entire vent by one pipe size".

So...you should probably increase the pipe size as suggested, especially if this is going to be inspected!!

Let me know what you think... MARK

After looking at this again, even if I went to 3", the main support beam running down the center of the basement would prevent me from making the straight run with proper pitch needed. "Depending on local codes" (of course), what would you think about tying the vanity and shower vent's together and using a Studor vent above the 8' ceiling where it would be accesible from my mechanical room?

Studor vents are illegal in most places that I know of.

BUT it couldn't hurt to call your local plumbing inspector and ask them if they are legal in your area.

Make sure to let him know that you are planning full accessibility to the studor vent from the mechanical room!

If studor vent not acceptable, maybe you can run the new vent up in the joist bay where you will go vertical to upstairs... that would get you up and over the support beam as you don't require a great amount of pitch to the vent... just require SOME pitch!

Let me know what you think.

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