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thanks for all your answers so far
the toilets are regular toilets not pressure assisted or blow out type
so it seems like the double san tee is better
A four inch vent is too large, You can vent both toilets with a 2 inch vent. One of the problems will be if you are doing a permitted job it will be best to check with Your Local Plumbing Official due to geographical locations. I will look at your drawing and tell you more. I teach plumbing at night for an Apprenticeship Program. I teach the Florida Plumbing Code...I saw your flat drawing and will suggest that you put a two inch vent on the lavatory and not a four inch. This will allow you to put in a regular 3-5/8's rough wall saving space for your water piping.
Last edited by OBD; 07-07-2008, 06:11 PM.
Reason: Addition of more information
here is the drawing from our code book...i had to resize it
yes in philly we are allowed to use a s-trap
why wouldnt you be?
i dont know about the UPC ...i dont do much plumbing outside the city
and the bathroom on the right will have a lav with its own 1 1/2 stack
down to the 4" main drain, with a 1 1/2 vent through the roof...its not on the drawing i was looking for opinions on the toilets rough in
thanks for all your answers
I teach the Florida Plumbing code which used to be the SBCCI Code (which is now called the IPC or International Plumbing Code) and the reason why using an "S" trap is illegal is because of wicking of the trap. Wicking is a form of Capillary Action. Its like putting a string from the dip of the trap and have it string itself over the weir. Since the waste arm is installed with pitch then it would wick the trap dry by capillary action.
Our floor Drains have Zero dfu count due to them being used only in an emergency and not as regular used fixture. It also seems that your plumbing board that approves the codes haven't updated to the low flow consumption fixtures, have they? Do you use the low flow fixtures now?
ODB: I teach the 2nd year apprentice course up here, IPC. I also hold a Fla. masters license. The Philly code is very different than what most of the country deals with. In fact they even have names for the strange and wonderfull things they allow. Best I can figure is they don't see an s trap on a lav as a problem, because the lav gets used often enough to keep the trap full and the 4" vent probably lets enough air in to keep back siphoning to a minimum. That said, I'll bet that if you could go back in time the real reason had something to do with payoff's and graft