Diagnose
Brown Water Stain on the Ceiling
A brown ceiling stain means water is getting into the structure, and the entry point is almost never directly above the stain....
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Diagnose
Granules in the Gutters
A light scatter of granules is normal, especially on a new roof shedding loose manufacturing grit. Heavy accumulation, bare black...
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Diagnose
Black Streaks Down the Roof
Black streaks on a roof are a blue-green algae called Gloeocapsa magma. It feeds on the limestone filler in asphalt shingles, it...
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Diagnose
Shingles Curling or Cupping
Curling or cupping shingles have dried out and lost the oils that kept them flexible. It is a late-stage aging signal, it cannot...
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Diagnose
Popping and Cracking Noises
Popping and cracking from the roof or attic is usually thermal movement: framing, decking and fasteners expanding in heat and...
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Diagnose
A Musty Smell in the Attic
A musty attic smell means moisture is present long enough for mold or mildew to grow. The three usual sources are a slow roof...
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Diagnose
Daylight Visible in the Attic
If you can see daylight through the roof deck from inside the attic, there is a physical opening. Pinpoints around nails are...
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Diagnose
A Sagging Roof Line
A visibly sagging or wavy roof line means something beneath the shingles has lost strength: decking, rafters or the ridge. It is...
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Diagnose
Missing Shingles After Wind
Shingles blown off in wind leave the underlayment and sometimes bare decking exposed. Cover it before the next rain, document it...
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Diagnose
A Leak That Only Shows in Heavy Rain
A leak that only appears during heavy or wind-driven rain usually means water is getting past a detail that handles normal rain...
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Diagnose
Wet or Matted Attic Insulation
Wet or matted attic insulation means water has been reaching it, from a leak above or condensation forming on a cold surface....
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Diagnose
Nail Pops on the Roof
Nail pops are fasteners that have backed out of the decking and pushed up under the shingle above, showing as small raised bumps,...
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Diagnose
Is It Hail Damage or Blistering?
Blisters are raised bumps in the asphalt that pop and leave small pits, and they appear on every slope regardless of which...
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Diagnose
Cracked or Split Shingles
Straight vertical or horizontal splits in shingles are thermal splitting, which is distinct from age-related curling and from...
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