I am a gc who has had to perform the plumbing portion of some of my projects in order to keep the project rolling along (everyone is swamped). So I am not a professionally trained plumber. My question is this. The inspector flagged me on the combo I used on the toilet saying it needs to be a san tee. I realize a santee is more typical in this spot but my rational for using the combo was that it would shorten the amount of horizontal pipe between the toilet flange and the vertical stack. The inspector said it will not work properly.properly. Is this correct? Is there a code that requires it to be a San tee that he can throw at me if I challenge him. Btw I also realize now that the two other incoming drains (lavatory and Shower would have been better connectednusing 45wye’s instead of the multiple sweeps. If I have to change out the combo, would you pros recommend I switch to the vertical wyes to bring in the other fixture lines too?
Thanks in advance
Plumbing – Combo wye at toilet
plumbing
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Best Answer
There are a couple of reasons why you cannot connect to a combo, no matter what you are hooking up. No combo can be vertical and tied into due to potential venting issues and the way the water washes away on a vertical combo.
The rule of thumb is you cannot lay a sanitary tee on its side or back and you cannot install a combo in the vertical position. Must be a sanitary tee.
You can connect a toilet to a combo, just not in the vertical position. I am a 20 year licensed plumber in Texas. We have some of the strictest codes and testing in the nation.