Robles Custom Roofing - Re-Roofing, Repair, & Inspection Specialist in Walnut Creek, Danville, Concord, Lafyette CA
A water spot on the ceiling or damp attic insulation is a sure sign that water has come through the roof. Probably, by the time you notice a spot, the dampness has been there for some time.
Dark patches on an asphalt shingle roof is evidence that protective granules have washed away.
Curling Shingles or Brittle Roofing are the most obvious sign that the sun has drawn out oil and moisture from your roof covering. Soon, water-admitting cracks will appear.
Once you have Split Wood Shake or Splintering Shingles your roof is probably no longer waterproof.