Two weekends ago I tore into the laundry room walls. The trap for the washtub was pretty clean, so that's not the source of the slow drain. The supply lines are wonky though. There is 1-inch copper in the basement for this branch on the hot side and 3/4-inch galvanized pipe on the cold side. For the riser, though, both are 3/4-inch galvanized - until they get to the floor of the laundry room, then they are 1/2-inch copper with ancient shutoff valves that are frozen open...
I stopped there for the weekend to plot how the waste and vent needed to be routed - I wanted to get the washer stand pipe into the wall and use a washer outlet box so we don't have to lay on the floor to shut off the water supply when the washer hoses burst...
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