How should a bath drain be vented?
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Answers:
You connect a Y pipe uderneath with a little screen on top. the side with screan should be higher than other side.
The bath drain should be vented thru the main stack which is usually a 3 inch diameter pipe which rises vertically and goes through the roof. Usually the toilet, bathtub and vanity are all connected to this main stack. The other end of the main stack goes to the sewer line.
There are 3 basic fixtures that occur in a bathroom that connect to the waste system.
They can be single, combinations and multiples.
The WC connects to the closet bend, through an integral trap, then to the waste line at a san-tee or wye which is vented through the roof.
The lav /sink is connected to a trap, outside of the wall, through that fixtures tail piece, to a san-tee, then to a vent, either separate or looped, to the main vent, and to the waste line through a wye.
A bathtub/tub-shower drains through a waste and overflow to a trap connected through a vented san-tee or wye to the waste line.
A stall shower drains through a trap and a vented wye or san-tee to the waste line.
The waste line subsequently connects to the sewer lateral near the boundary of the street right of way.
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