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mikect05 · Nov 28, 2011, 01:58 PM

Hi, I have two 2" vent pipes coming up from my basement bathroom and would like to join them together, since they are both running parallel can I use a wye to join them vertically in the wall before entering my attic.

Also in order to have one or both enter the attic I need to cut out the header completely as it is a 2x3 wall. It is a non load bearing wall, so what is the best way to brace it? Thank you

massplumber2008 · Nov 28, 2011, 02:08 PM

Hi Mike

You can join the two vents using a wye fitting and a 45 (or street 45) or a sanitary tee and a 90 (or street 90, but you must install the wye or sanitary tee fitting so it is upside down, OK (see image).

In terms of the 2"x3" wall, put some screws into the header on either side of the hole you will be drilling and just drill/cut the header as needed... wall shouldn't loosen if it is old, existing wall... will be nailed in place every foot or two.

Back to you...

Mark

speedball1 · Nov 28, 2011, 02:11 PM

since they are both running parallel can I use a wye to join them vertically in the wall

As long as they're dry bents, Yes you can. We call that "reventing".

Also in order to have one or both enter the attic I need to cut out the header completely as it is a 2x3 wall. It is a non load bearing wall, so what is the best way to brace it

Can you scab a piece of wood onto the studs and attach to a attic rafter? That would make both sides of the wall ridged. Good luck, Tom

ma0641 · Nov 28, 2011, 02:23 PM

You have 2 good answers from 2 great people! Normally you could use a revent. However, since you said "basement", what are the basement vents connected to? If 1 of the vents from the basement is for an ejector pump then you cannot combine them as an ejector must have a dedicated vent.

mikect05 · Nov 28, 2011, 05:50 PM

Thanks for the quick replies guys!!

I have a vent from a bathroom, and one from the laundry sink and washer.

I do have an ejector pump and as far as I understand under IPC it is not prohibited to revent it. It is a LIBERTY system and in the installation instructions it states that it can be revented. Please correct me if I am wrong.

ma0641 · Nov 28, 2011, 06:30 PM

I'm not familiar with the Liberty system as I never see it in Atlanta, at least not yet. However, I have never seen a pit ejector in the Atlanta Area that did not have a dedicated vent. Maybe Mike or Tom could clarify that point. Brian

mygirlsdad77 · Nov 28, 2011, 06:34 PM

Not to open a can of worms here, but yes, you can revent a sewer ejector pit under some codes. UPC allows it. Most inspectors like to see a dedicated vent for sewer ejector. In my area we don't have to do this, and have never had an issue.

speedball1 · Nov 29, 2011, 08:07 AM

Let's see why a dedicated vent is called for in a ejector pit.
While you may revent the fixture vent back to the house system or even use a AAV a pit vent is quite different.
A fixture pulls air into the system as it discharges. However as it enters the pit it pressurizes it so it expels the air out the pit vent.
As the pit discharges it also pulls air back through the same vent.
Most codes do not allow you to force pressurized sewer gas back into the house venting system. And that's why most installations call for a dedicated pit vent. What makes yours different? If changes have been made then please let me know, Regards, Tom

mikect05 · Nov 29, 2011, 09:01 AM

Hi Tom, no special ejector pump and I do understand the reasoning why it should get a separate vent. I was just saying that the literature that goes with my pump says it can be tied back into the houses existing vent. I looked up the code and all I could see is that it only made an exception for a dedicated vent for a pnematic pump system. Also I checked with my town inspector who stated that is how he has always seen it done around here and has no objection to it.
The vents I want to join however are from laundry and bathroom though.

speedball1 · Nov 29, 2011, 09:36 AM

Although I don't think it's good plumbing practice if code permits who am I to bump heads with code?> Revent away! Good luck, Tom