I'm going to put a washer/dryer into a spare room. One wall is shared
with a bathroom so i've got a drain and water in that wall. Can I use a
T-adapter to connect a standpipe into the drain? or is there another
standard procedure for taping into a sink drain with a washing machine.
This is not so simple a problem as one might imagine.
Because of the large flow from the washer, the connection
must be made directly into the stack (3" or 4" likely).
AND....the connection must be made *below* where the toilet
(and maybe other fixtures) tie in. That's because the flow
from the washer will try to suction the water out of the
toilet trap if connected above.
Next, the connection will need a P-trap to prevent sewer gas
from escaping into the laundry room. AND...the P-trap will
need a vent line to protect its water from being siphoned by,
say, the toilet flow. (You *may* be allowed to use a mechanical vent).
Wanna be covered and assured it's done right? Call the city
bldg dep't for advice on their specific requirements.
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