how to tell if it's a roof leak

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Wondering if that water stain on your ceiling is from a roof leak or a plumbing issue? During a rainstorm, head up to your attic with a flashlight and look for active drips, or sunlight peeking through the sheathing. After the rain stops, check for dark, expanding patches on the drywall, or even a musty smell. Roof leaks often show up right after heavy rain, not when you run the washing machine.