I've had a problem since buying this house that now needs to be fixed. The washing machine is in the basement, raised up about 12" off the floor. The washer has a vent cap that rises from the drain pipe with an AAV?
The house has 2 vents stacks, one near the main waste line - 4' PVC stack thru the roof. On the other side of the house - 36' away is a 2nd vent line thru the roof, starts as 3" then changes to 4" somewhere in the wall. This vent in the basement is cast iron & changes to PVC before going thru the roof. A garage is being added & at that time the wall will be ripped out & cast iron replaced with all PVC
Main sewer line w/connection in the basement is still cast
2" Drain drops ~5" over 35', so 1/4" per foot is not met
Once the kitchen is renovated I will gain 4" as the drain pipe will move up to the joists & I will have a 9" drop over 35'
Kitchen will then have: Sink & dishwasher
Then below in the basement will be the laundry room
Currently there is a 2" drain pipe running the 35' across the house. The kitchen sink drain pipe is 1.5"
When the washer is running, detergent bubbles come up thru the kitchen sink. Some water also comes out of the where the washer drain goes in to the drain. The kitchen sink does not have a vent pipe - there are double windows over the sink. The kitchen sink drain goes 41" to the basement, one way is then the drain, the other goes to the vent stack
With replacement of the kitchen counter top (Old rusty metal edged) with a "new to me" counter top one of the dual sink drains is leaking when the washer runs. Just needs a new gasket - I'm hoping
But, now I want to look into what size drain pipe should be installed to properly drain the laundry & kitchen
Does the 2" pipe need to be upgraded to a 3" pipe by code?
If not, will upgrading the pipe resolve the issue for now?
It will be another year before the kitchen is renovated & plumbing re-worked
Does the kitchen sink need a better venting method to meet code? This can be reworked when the kitchen is renovated
Pic of the washer trap & drain setup
Pip on the right then goes thru a 90 & then up to kitchen sink - rise of approx 41". In the basement the 2" pipe then goes on another 3' & then up as the vent stack