I have searched this board looking for an answer and the main solution is to snake the drain which I have done all the way to the main.
Here is the situation.
Washer sits on exterior wall 7ft from main line there is a 1 1/2" stand pipe 3 ft long that sticks out above the washer by 3 inches it 90 degrees into a 2" about 8 inches from floor the 2" pipe then connects to an Iron pipe that goes under the floor over to the main. When washer is pumping out it overflows the 1 1/2" standpipe. I have thought about converting the stand pipe to a 2 inch pipe as well but am unsure if I can make the connections as there is not much room for error with the 2" pipe in the wall. The 2" pipe also serves the kitchen sink as well as dishwasher. Everything points to a vent issue however everything else drains correctly. My question is this if I remove the clean-out that is further up the 2" pipe below the upstairs sink and dishwasher and attach a 90 degree up and a 2 " pipe for an extra vent will this solve the problem with the washer or cause another issue with gas. History: when I moved in one of the joints in the 2" pipe was not cemented in so there was an extra spot for air to vent into the system which caused a slight drip when the upstairs sink and dishwasher were used I repaired that by cementing the PVC together and that is when my current problem occurred. any help would be appreciated.

speedball1

"My question is this if I remove the clean-out that is further up the 2" pipe below the upstairs sink and dishwasher and attach a 90 degree up and a 2 " pipe for an extra vent will this solve the problem with the washer or cause another issue with gas."

this is not a good idea. You will have installed a direct connection from your house to the sewer allowing sewer gas to enter your home.

"when I moved in one of the joints in the 2" pipe was not cemented in so there was an extra spot for air to vent into the system which caused a slight drip when the upstairs sink and dishwasher were used I repaired that by cementing the PVC"

This also allowed sewer gas to enter your home. The problem That seems to be reoccurring is the newer washer pumps are too powerful for the undersized systems it discharges into. As far as I can tell the washer isn't vented by code. It wet vents through the kitchen vent. Solution: A less powerful washer pump or larger diameter drainage pipes. regards, Tom

speedball1

tojodawson
New Member Join Date: Dec 2006
Posts: 1


follow up to answer

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Thanks for the answer. would an upgrade of the 1 1/2" pipe to a 2" along with a slow 90 help the problem or will I need a wash tub to drain the washer into and let gravity drain that. I am tempted to just make the brand new landlord send a plumber out. Just trying to fix it without taking off work to let a plumber in
Thanks
Chad

As a rule I would say, "incease the pipe size" but I'm not sure it would help.
I think a laundry tray might be the answer to your overflow problem. This would cut down on the pressure going into the drain pipes. Good luck, Tom

tojodawson

Thanks Tom I am going to let the landlord Decide