attic condensation 4

https://mega-wiki.win/index.php/How_to_Tell_If_It%27s_a_Roof_Leak_or_Something_Else_on_Your_Ceiling

I never realized how much moisture builds up in an attic until I started noticing water stains on the ceiling below. It's not a leak, just condensation forming when warm, humid air from the house meets the cold roof sheathing during winter. Now I make sure to seal any gaps around vents and improve ventilation up there.