Originally Posted By: janderson
This post was automatically imported from our archived forum.
Looking for opinions as to the cause of this situation. Two plumbers and one drain cleaning service are scratching heads. My thought was that it is has to be some type of vent problem.
Quad home, units are stacked with two on each side. They share common waste plumbing systems on each side. One of the top units has been experiencing a back up of water when the clothes washing machine discharges water on the spin cycle, when pumping out the soapy water. This is a wall type discharge 2" pipe diameter. According to the homeowner, this has been occurring since they moved in 14 years ago, they purchased the unit when it was brand new and are the only owners. They have adapted by waiting for the spin cycle and stopping it half way though, then wait for about one minute for the water to drain and then start it up again.
The main line has been cleaned recently, that contractor said at 45 feet only a small amount of string was removed and the rest was clean. However, in speaking with them they did mention that they were unable to go up though the vent and out the roof cap as their seemed to be some type of obstruction. When I questioned them about that in greater detail they said that was not unusual for that to happen because of the design of waste venting in quad units.
Within the seeds of ignorance lie the fruits of denial