Originally Posted By: jpope This post was automatically imported from our archived forum.
This is a plumbing vent system in attic. Other than the wye possibly being upside down for this application, can anyone tell me if there is anything else wrong with this set up? In particular, I’m questioning the 90 degree bend. It’s just over 3 feet long if that matters.
-- Jeff Pope
JPI Home Inspection Service
"At JPI, we'll help you look better"
(661) 212-0738
Originally Posted By: kmcmahon This post was automatically imported from our archived forum.
I believe the wye is in the correct configuration, and as far as I tell in the books I have, that 90 is allowed. However, it does need an upward slope.
Originally Posted By: jpeck This post was automatically imported from our archived forum.
The 90 is okay because this is a vent.
The wye is a sanitary tee and upside down (for the vent to vent properly, the sanitary tee needs to be turned so the air can vent upward into the vent, not be trapped below the downward facing sanitary tee).
Another problem I see, and it may just be an illusion, is the horizontal section goes downward.
Originally Posted By: kmcmahon This post was automatically imported from our archived forum.
Jerry, for some reason the books I have thow the wye in the configuration shown in Jeff’s photo’s. I’m not sure why, as the reason is not given, but could it possibly be to allow any condensation to drain down the stack? Just a guess.
Originally Posted By: jpeck This post was automatically imported from our archived forum.
First, let’s not keep calling that a ‘wye’, okay? It’s a sanitary tee.
Second (Kevin) for water to drain, the sanitary tee does go that way (so water can run downhill), however, for a vent, it goes up (so air can go uphill).
Originally Posted By: kbowles This post was automatically imported from our archived forum.
jpeck wrote:
First, let's not keep calling that a 'wye', okay? It's a sanitary tee.
Second (Kevin) for water to drain, the sanitary tee does go that way (so water can run downhill), however, for a vent, it goes up (so air can go uphill).
Sorry Jerry, you are wrong in this case. The tee is installed improperly as when a vent is DRAWING air to prevent a suction from causing the drain to not drain properly, the air will be coming DOWN the pipes. Therefore, this tee is installed improperly for a VENTING application. The tee should be installed so that the air would make that turn coming down the vent and the way it is installed is not a fluid motion.
Originally Posted By: jpeck This post was automatically imported from our archived forum.
kbowles wrote:
jpeck wrote:
First, let's not keep calling that a 'wye', okay? It's a sanitary tee.
Second (Kevin) for water to drain, the sanitary tee does go that way (so water can run downhill), however, for a vent, it goes up (so air can go uphill).
Sorry Jerry, you are wrong in this case. The tee is installed improperly as when a vent is DRAWING air to prevent a suction from causing the drain to not drain properly, the air will be coming DOWN the pipes. Therefore, this tee is installed improperly for a VENTING application. The tee should be installed so that the air would make that turn coming down the vent and the way it is installed is not a fluid motion.
Air gets DRAWN IN, and sewer gases get LET OUT. Air being DRAWN IN is under slight pressure and can negotiate that upward bend (somewhat). HOWEVER, sewer gases escaping would get trapped at the upside tee. What, you've never seen sewer gases escaping? What, there is NO REASON the code requires a plumbing vent to be 10' from a building opening or window? That is NOT because of the air GOING IN, that is because of the sewer gases GETTING OUT. I.e., rising UP.
STILL ... that tee is installed upside down in the vent, and your response at first seemed like you were saying it was supposed to be that way ... but then I realized you were just trying to make an (incorrect) point on which direction the air goes.
Originally Posted By: jpeck This post was automatically imported from our archived forum.
jpope wrote:
Am I missing something here? You guys are both saying the same thing. The tee goes up for a vent. The installation in the picture is wrong. Right?
Right.
What you are missing is that I said 'air goes up' and I was corrected with 'no, air goes down', to which I replied 'air goes up, but yes it also goes down' - - - but either way, that was installed upside down in your photo.
Originally Posted By: jpope This post was automatically imported from our archived forum.
jpeck wrote:
What you are missing is that I said 'air goes up' and I was corrected with 'no, air goes down', to which I replied 'air goes up, but yes it also goes down' - - -
"I see," said the blind man 
You're right Todd. It's not likely that this would be changed, however, that does not mean that it should go unreported.
-- Jeff Pope
JPI Home Inspection Service
"At JPI, we'll help you look better"
(661) 212-0738
Originally Posted By: tallen This post was automatically imported from our archived forum.
I agree. I would report it . However , the odds are the plumber ain’t ’ gona fix it if it ain’t’ broke.
I have had many calls about such things. IE; double lugged neutrals, S trap etc. The agent calls ----I talk to the tech----I win----Realtor never calls me again( unless it's her( his) house)
