My locality recently switched to the I.P.C. I want to tie in a washing
machine on the basement floor to the 2" drain/vent for my kitchen sink.
Can I re-vent the washing machine (basement) above the drain for the
kitchen sink (1st floor) and be OK with code or will I need to put
another hole in my roof? Thanks for any insights. It seems like
reventing above the drain should be fine, but it's not very clear to me.
I have been doing some more reading. An easier way to comply with code
requirements seems to just use an air admittance valve (aav). Does
this look right? Thanks again for any insights.
| 2" vertical vent to roof
----Horizontal branch to Kitchen (1st floor)
| AAV (>4" abv trap)
-------|_|--- new branch to Washer (basement)
| 2" drain into slab that connects with main.
Yes you could do this BUT...
Don't be surprised if when you drain a full sink or run your dishwasher, you
get a glugging sound from the washer stand pipe. With this setup you will
allow air to enter the vent to protect the washer trap from vacuum but the
valve will not let air out from the high pressure in front of the slug of
water from the kitchen. And that is why I will not use them. Having done
service in new houses with these installed in them, the biggest complaint is
the weird noises in the drains. (And for those that want to pay for it, when
I run a proper vent, the noise goes away.)
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