Originally Posted By: jpeck
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I think Jeff Pope is on the right track.
Looks like excess flux was not rinsed off, which is acidic and can cause long term deterioration.
All flux should be rinsed off (all joints should be wiped after soldering). That alone is a good enough call to have the plumber address any, if any, long term corrosive damage to the pipes.
Even if the plumber says "It's no problem.", when (if) it does leak, you client will remember "Oh, yeah, that's what my inspector was referring to when he pointed that out."
By the way, that looks like a repair. The insulation is all pulled back and the two pipes are contorted with elbows. This is how plumbers make repairs. Cut the pipe, install two elbows facing up, cut a length of pipe to go between the two elbows, install two more elbows on that short length of pipe, then cut two very short pieces of pipe, dis-assemble everything, emery paper it all, flux it all, re-assemble, solder it all, the get-heck-out-of-that-hot-attic.
Oh, DANG! I forgot to wipe the joints clean when I was done! Who will ever know?
Shoulda moved that insulation back, that would have at least hidden it. Dang, am I stupid.