
Furnace in attic. Moisture noticed.
Noticed this water mark for past couple years. What is causing this? Located in attic. Is this poor sealing around seams?
Furnace is about 10 years old.
Appreciate insight on cause and solution.

Noticed this water mark for past couple years. What is causing this? Located in attic. Is this poor sealing around seams?
Furnace is about 10 years old.
Appreciate insight on cause and solution.
Noticed about installing the spout is crooked and leaves gap 1/8 to 1/2 on one side. Took the new one off and pipe of course is slight angled. The old one was straight. I’m pretty confident I didn’t move it while replacing.
Would the original one have been handled tighter and pushed against the wall (shell) to keep flush?
I siliconed around the gap - only thing I could think to do.
What are your thoughts. Is this okay to silicone? Should I get a plumber to come? Or should I try to move the copper pipe to straighten it slightly?
The house is mostly all pex built 2000
Thanks!