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Old 03-16-2011, 09:54 AM   #1
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Beam in unheated crawl space in Chicago, pipe is hot water to baseboard system, this material was not present elsewhere. Sorry, do not have better pictures.

What am I looking at?
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Old 03-16-2011, 12:52 PM   #2
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Wondering if it is possibly where the apprentice happened to get his first opportunity to actually solder some pipe in the field?

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Old 03-16-2011, 01:37 PM   #3
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Don't see any scorching...
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Old 03-16-2011, 09:13 PM   #4
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No one knows?
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Old 03-19-2011, 09:46 AM   #5
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It appears to be sticking to the wood as opposed to being loose and easily brushed off (not scraped). Is this so? If so, this would rule out ant frass, but could still be cockroach fecal material, which is sticky. However, my gut feeling is that this is not insect/rodent related, especially since you are not finding evidence elsewhere.
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Old 03-19-2011, 10:05 AM   #6
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In the pic on the left, if you look at about 07:30 about an inch from the pipe, it appears to be a couple droplets of solder (silver). I see similar droplets in a couple other places as well. I suspect that is simply the burns from solder droplets, solder itself, or flux.

that is, unless you know of a bug that poops silver solder looking stuff.

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