The drain that my washing machine overflows during the rinse cycles. We have replaced the pipe and snaked the main pipe (metal pipe where pipes drain to). I have a Sear washer (older 12 yrs model) and it says it requires a 34" in standpipe with diagram showing 34" from floor to top of pipe. We used a 2" dia pipe and it is 34" long and goes into a P trap and then a horizontal pipe over to the metal pipe into the ground. The metal pipe into the ground also has the vent to the roof joined to it. We have snaked that too. My installation instructions says it must have the 2" dia pipe, 34" min 72" max standpipe and the drain must be able to carry away 17 gallons per minute. Since I've met all the other requirements and it still comes back, how can I test the 17 gal/min and should I try to use a 3 or 4" dia pipe for the standpip and horizontal pipe to the metal drain into the floor.
You are saints for helping everyone here. I read lots of other posts about washer drain problems but didn't seem to find the same issue though in the end it might be! thanks for any help/suggestions/advice.

speedball1

You have met the specs for the size of standpipe and its height. What I question is how much cable,( snake) did you run out after you hit the bend at the base of the vent. you should have ran out at least 20 foot more. From the bend of the trap to the top of the standpipe how much distance do you have? We don't measure a standpipe from the floor. Say your trap is 18" off the floor. At 34" from floor to top that would give you a 16" standpipe. We install our washer traps as close to the floor as possible and come off that with a 36" standpipe. You say you have looked through the other threads? Let me copy a portion of a reply to the Maytag Washer having suds backing up thread. " you might do what I did when the suds from my washer started to bubble out the top of my standpipe. Install a compression fitting on the standpipe and connect the washer hose to it. To see what a slip to compression fitting looks like click on http://www.plumbingwarehouse.com/pvccomp.html and go to the bottom of the page. you will have to get the compression end the same size as your washer hose and adapt the slip side to the same size as the stand pipe. In the meantime why not wrap some wet rags around the hose and use t6hem as a "caulk" to contain the suds as you wash. If you haven't run out enough snake you haven't caught the clog. Regards, Tom