25 Roof Leak Warning Signs (With Photos) — When to Call a Roofer for Repair

Moment #4: Moisture discoloration on attic decking

Subtle discoloration on roof decking is a common “quiet leak” sign. It may appear long before you see a ceiling stain, especially if insulation absorbs the first moisture. Look for darkened wood, small water tracks, or a slightly glossy damp surface near seams. Persistent moisture here can lead to mold and structural weakening, so it’s worth documenting and checking again after rain.