Roof flashing is one of the most important — and most overlooked — parts of your roofing system. It seals the vulnerable areas where water can easily sneak in: around chimneys, vents, skylights, and roof edges. When flashing becomes loose, cracked, or damaged, leaks often follow.
Here’s how to spot flashing problems early and prevent costly repairs.
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1. Look for Loose or Lifted Flashing
Wind, storms, and temperature changes can cause flashing to pull away from the roof surface.
Signs include:
- Flashing that appears lifted
- Gaps between flashing and shingles
- Visible nails popping up
- Flashing that rattles in the wind
Even small gaps can allow water to enter.
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2. Check for Rust or Corrosion
Metal flashing can rust over time, especially around chimneys or areas with standing water.
Look for:
- Orange or brown discoloration
- Pitting or flaking metal
- Holes or thin spots
Rust weakens flashing and makes leaks more likely.
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3. Inspect Sealant Around Flashing
Roofers often use sealant to reinforce flashing edges. Over time, sealant can:
- Crack
- Dry out
- Peel away
- Separate from the surface
If the sealant is failing, water can slip underneath the flashing.
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4. Examine Chimney and Skylight Flashing
These are the most leak‑prone areas on any roof.
Check for:
- Gaps between flashing and brick
- Missing mortar
- Loose counter‑flashing
- Water stains inside the home near these areas
Chimney flashing issues are extremely common and should be addressed quickly.
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5. Look for Water Stains Inside the Home
Interior signs of flashing failure include:
- Brown ceiling spots
- Peeling paint
- Damp drywall
- Musty odors
If stains appear after rain, flashing is a likely culprit.
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6. Check Roof Valleys
Valleys carry large amounts of water during storms.
If flashing in these areas is damaged, leaks can spread quickly.
Look for:
- Exposed nails
- Bent metal
- Debris buildup
- Water pooling
Valley flashing issues should be repaired immediately.
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7. When to Call a Roofing Professional
Call a roofer if:
- Flashing is visibly damaged
- You see interior water stains
- Sealant is cracked or missing
- Flashing has pulled away from the roof
- You’re unsure how extensive the damage is
Flashing repairs are typically quick and affordable — especially when caught early.
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⭐ Related Guides
How to Spot Early Signs of Roof Damage
Roof Leak After Rain? Here’s What to Do First
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⭐ External Resources
FEMA – Protecting Your Home From Water Damage
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