Question by Momwithaheart: Why does the water back up into the shower when the washing machine goes into a spine cycle?
The water in the shower gradually goes down on its own in approx. 5-6 mins. The bathroom and laundry room are side by side. so the plumbing pipes are probably shared. The house is 38 yrs old. Both shower and toilet have been snaked.
Answer by Rollin_West
Sounds like the common drain is still slow. You might need to snake them again.
It’s possible that the problem is with the main sewer line. Sometimes you need to rent a commercial drain snake and get very deep in to the pipes.
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