What Is Roof Flashing?

• Roof flashing is a waterproof material (usually steel or aluminum) designed to redirect water away from vulnerable areas on your roof.
• It protects spots like chimneys, skylights, vents, and roof valleys from leaks and water damage.
• Improper or damaged flashing can lead to water damage, mold, rotting, and even pest infestations.

How Roof Flashing Works

• Strategically placed to seal and protect corners, crevices, and intersections where water could seep in.
• Guides water safely off the roof into gutters or away from structural vulnerabilities.

7 Common Types of Roof Flashing

• Base Flashing
• Used at vertical-to-horizontal intersections (e.g., where a roof meets a wall).

• Installed under siding and shingles, so it’s typically hidden.

• Step Flashing

• “L”-shaped pieces placed along corners where the roof meets a sidewall.

• Often partially visible; homeowners may choose matching materials for aesthetics.

• Counter Flashing

• Works with base flashing to create a watertight seal around chimneys or brick walls.

• Best installed during chimney construction but can be retrofitted.

• Continuous Flashing (Apron Flashing)

• Long pieces redirect water from vertical walls and sloped roofs into gutters.

• Valley Flashing

• Lines roof valleys (where two roof planes meet) to guide water off the roof.

• Kickout Flashing (Diverter Flashing)

• Redirects water into gutters when a gutter ends near a sidewall.

• Prevents water from running down the wall.

• Drip Edge

• Placed along roof edges to stop water from dripping behind gutters, preventing rot.

Signs Your Flashing Needs Attention

• Corrosion or rust on flashing and gutters.
• Broken or curling shingles near flashing.
• Patches on the roof, indicating temporary fixes.
• Water damage inside, such as attic stains or mold.

Costs for Repair or Replacement

• Chimney flashing: $300–$1,500 for replacement, $200–$500 for repairs.
• Other flashing repairs: Vary by type, size, and severity of damage.

When to Call a Professional

• Roof flashing installation and repair are complex and require precision.
• Missed spots or improper sealing can lead to expensive water damage later.
• Hire a local roofing expert for inspections and repairs if you notice any warning signs.

Proper roof flashing is essential to protecting your home from water damage. Regular inspections and maintenance can save you from costly repairs down the road!

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