Keep a lookout for cracking, buckling, curling, or missing shingles. While you’re at it, don’t forget to check your gutters for shingle granules. This is a strong sign your roof is just plain worn out.
The only time your roof should be green is if that was the original color. Green growths and streaking indicate moss, algae, lichen, or mold fungi. These are usually an indicator of more significant, hidden moisture and water damage.
A wavy, droopy, or crowning look to your roof is never a good thing. These signs can mean underlying moisture damage is creating rotting in the roof decking or structure supports.
Flashing around vents, skylights, and chimneys protect roof seams from rain and weather penetration. Periodically check these points for cracks, breaks, or missing caulking to insure proper defense against the elements.
If you’re concerned about your roof, the first place you should explore is the attic. Peer around for stains or streaking. Then turn the flashlight off to see if any beams of light are sneaking through. Any of these signs can indicate a leaky roof.