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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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tn_2014512184435_DSCF1297.jpg

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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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