New answers tagged drains
Get the washer drain piping snaked out. Have the plumber run down the vent stack for the washing machine. This should take care of your problem.
It it is a new build, then removing the trap under the sink will not be an issue. Just loosen the nuts, remove the trap (have a pan underneath) and then clean the trap. This is most likely the source of the slow draining. If the trap looks clean, then get a hand auger (snake) to clean the drain line. It is best to do this with the trap out. Hand augers ...
Yes, in most every home, multiple P traps eventually go into a single drain. The important considerations are that there is proper slope, there's a vent within a certain distance of the drain (either wet or dry), and that the drains are properly sized. What you can't have is one P trap in line with another (creating an air locked section), but two P traps ...
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