Venting a bathroom sink
Posted by Robert on December 02, 2001 at 13:39:24:
Our builder decided to vent the downstairs bathroom sink out the side of the vanity, not out the back. Since the vanity is in a corner of the bathroom this was OK. Now, we want to replace with a freestanding vanity, and run the pipes out the back or through the floor. Problem is there is no DWV in the back of the current vanity.

Now, the question. Can I vent the sink downward to the DWV pipe below the subfloor? I'm envisioning a trap, then a downsloping pipe to the main DWV. Is this kosher? If not, what are my options?



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