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Posted

Gentlemen:

This foam had come out of the boot flange or appeared to come out of the boot flange of the laundry room vent stack. The pipe did not feel wet as would have been my expectation. Any idea how or why the bubbles?

Thanks.

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Posted

It probably bubbled up from the inside the vent pipe - then evaporated quicker on the warm pipe.

If it bubbled up from below the vent collar, it would be an obvious wet mess inside just below.

Posted

Everything inside was found to be normal, well as normal as could be. I just never had the pleasure of seeing soap bubble all the way up the vent like that prior to today. See something new everyday.

Thanks for the feedback.

Posted

Something is seriously wrong with the drainage for the vent to be blowing bubbles like that. The washer is pumping soapy water into the drainstack faster than it can get away, IMO.

Posted

I was told once that the code change a few yrs back requiring clothes washer standpipe to join directly to a minimum three-inch branch was due to soapmakers' efforts over time to make their product more and more sudsy, because market research told them the sudsier the better in consumer's mind. If the home is older and the 1 1/2 connects with a 2 the suds may be backing up the vent.

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