roof leak or condensation 21

https://wiki-book.win/index.php/Is_It_a_Roof_Leak_or_Condensation%3F_How_to_Tell_the_Difference

It's one of those mornings where you wake up to a damp spot on the ceiling, and you're not sure if it's a roof leak from last night's storm or just condensation from poor attic ventilation. The telltale sign is often the pattern—leaks leave a single dark trail, while condensation spreads in patches. Either way, mold starts creeping in within days, so you're up in the attic with a flashlight, feeling for soggy insulation and checking for frost on the roof deck.