Hello,

We are on the second story of a new building. Sometimes when we wash our hands, bubbles from the hand soap overflow back out of the overflow vent.

I don't think this is an issue, but I have been asked numerous times why this is happening.

Is this something I should be concerned about, or just a normal occurrence?

Thank you!

Over flow vent in the sink face, this can happen but nothing to worry about unless your are getting drainage problems, then I'd rod the drain and clean out the trap.

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Is this something I should be concerned about, or just a normal occurrence?

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It'snot normal but it's nothing to get worried about unless drainage is affected. So you'll better understand Let ne show you what's happening. Good luck, Tom