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What is roof flashing and why does it fail?

Flashing is thin metal that seals the joints where the roof meets walls, vents and valleys. It fails when it rusts, loosens, or the sealant around it dries out, letting water slip in.

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Answered by RingaRoofer · Roof repair

Flashing is thin metal that seals the joints where the roof meets walls, vents and valleys. It fails when it rusts, loosens, or the sealant around it dries out, letting water slip in.

What to know

  • Common spots: where the roof meets a wall, around vents, in valleys.
  • Signs: rust, gaps, lifted edges, stains below those spots.
  • Fixing flashing is usually a repair, not a re-roof.
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General information for homeowners, not a substitute for a roofer looking at your roof. More on this: Roof Repair.

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