RJ539
New Member
Loc'n: Rural Spokane County, WA
Is there any provision within the UPC venting requirements that would allow me to reduce the my 3" dia. soil stack down to a 2" dia. vent stack extending above the highest branch drain and then thru the roof, short of adding a second 2" dia. vent stack (for a total of (3) 2" dia. vents thru the roof) to adequately vent my 2-floor 3" dia. soil stack which drains into a 4" dia. septic line as it exits the building?
The soil stack will service 5 branch drains totaling 18 DFU's initially, with the possible future increase to 22 DFU if an island sink and dishwasher are added to the kitchen at a future date.
Possibly, the simpler question is, "Must a 3" dia. soil stack have a min. 3" dia. vent stack?"
Thanks in advance for any input, Russ
Is there any provision within the UPC venting requirements that would allow me to reduce the my 3" dia. soil stack down to a 2" dia. vent stack extending above the highest branch drain and then thru the roof, short of adding a second 2" dia. vent stack (for a total of (3) 2" dia. vents thru the roof) to adequately vent my 2-floor 3" dia. soil stack which drains into a 4" dia. septic line as it exits the building?
The soil stack will service 5 branch drains totaling 18 DFU's initially, with the possible future increase to 22 DFU if an island sink and dishwasher are added to the kitchen at a future date.
Possibly, the simpler question is, "Must a 3" dia. soil stack have a min. 3" dia. vent stack?"
Thanks in advance for any input, Russ