Rich B
DIY Senior Member
I have two washing machine drains to plumb and vent. I am upgrading them to the proper size 2" using wyes into a short 4" horizontal C.I. section. I can go straight up with a vent. The two washer drains are seperated by a block wall in the basement, as this is a 2 family house. Can I use 1-1/2 for the vents, go straight up and join the two together in the common wall above? From there it would join with a common vent for one of the bathrooms upstairs. A tub and a sink....then up thru the roof and increased to 2"....The existing washer drains had no vents and are 1-1/2" and are poorly done in galvanized pipe.
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