What roof flashing does around a wall or chimney

Dekoven Roofing

November 13, 2026

Flashing directs water where roof surfaces meet walls or roof openings. A gap at a transition can allow water into areas that look unrelated from inside.

Ask where the flashing sits beneath the roof covering and what needs to be removed to reach it. The proposal should identify the detail being repaired and how it will tie back into the surrounding roof.

If you need help finding the source of a leak or deciding what work to request, ask Dekoven Roofing for a roof assessment.

What flashing does

Flashing is thin metal or similar material that directs water away from joints, such as where a roof meets a wall or chimney.

Common flashing locations

  • Chimneys and walls.
  • Valleys.
  • Vent pipes and skylights.
  • Roof edges and dormers.

How it fails

Movement, age, rust and failed sealant open gaps. Water then enters at a joint rather than through the open roof surface.

What a repair looks like

Depending on the condition, flashing may be resealed, repaired or replaced, which may involve removing nearby shingles or siding for access.

Frequently asked questions

Can I just add sealant?

Sealant can slow a leak, but it is often a short-term fix. Ask the roofer what will last at the particular joint.

Related: Request a roof assessment

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