Might be vent boot on roof is leaking and water running down outside of stack. Run the hose around the vent boot and see if you get water inside.
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Sent from my Moto E (4) Plus using Tapatalk
It's possible. Are any of those pipes hot water pipes?Thank you. There is no moisture on the outside of the stack all the way up, and we had a couple of storms the last two days. I am wondering whether it could be condensation but cannot figure out how old it is and from where. (I opened this cavity because we are doing remodeling. The water has been standing there ever since, a couple of weeks already.)
2ft away? Not likely, even using 50/50 solder. But a joint can resealIs it possible that soldering in one place can open up a solder joint two feet away and for that solder joint to reseal once cooled?