WC venting, UPC code
I have the following situation for a WC (see pics)... the WC is dropping to a closet bend then going down for around 1ft at 45-deg... I can vent it either on the 45-deg drop (so about 10" below WC) or after it levels out (around 14" drop from the WC). I cannot vent before dropping down b/c there is a chimney in the way and I must turn and drop right away.
Normally, for a fixture the vent take-off must be above the p-trap weir; in a WC of course that is not possible... but I am wondering what the acceptable limits are... or how far can I drop below WC closet flange before venting?
So am I ok with alternative #1 or #2 (see pics) or must I do something else?
For the water closet, either would be fine. It needs to be a wye or combo fitting on the vent.
For a water closet, you could even have taken it off the vertical with a wye. In King county, the vent should be within six feet of the flange.
Either will be fine, but if the inspector is one who only reads the book, but does not know WHY it is in the book, he may have a problem with it.
The Seattle inspectors are good. I don't see a problem.