Venting a Pesdestal Sink
We have a 1930’s home where we are installing a pedestal sink into an old vanity bathroom on the first floor. Never having installed drains before, I am not certain on how I should proceed as far as hooking it into the drainage system of the house. I have spoken with several folks, and I realize that the sink must be vented.
The question I have is, is it possible to tie the sink drain into the existing stack vent of the house? Given the location of the bathroom and other drains in the house, this is the easiest place for me to go to. I know I could install an air admittance valve, but since it is a pedestal, it will be a little unsightly (also, putting the AAV in the wall is not option – too much plaster to break into).
From what I have read, I think it is O.K. to tie it into the stack. However, one more thing about it is, there is a bathroom directly above that also ties into the stack. Would this at all prevent me from tying in the pedestal on the first floor? Thanks!