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Guide to Different Roof Flashings and Installation Techniques


3 min read

Jun 17




Roof flashing is a critical defense against water damage, ensuring your home stays dry and secure. This comprehensive guide covers various types of roof flashings, installation techniques, and tips for maintaining them. At Fasto Roofing, located in Mason, OH, we pride ourselves on our commitment to excellence and detailed processes, ensuring your roof is always in top condition.

What Is Roof Flashing?

Roof flashing is typically made of metal and is designed to direct water away from areas where vertical surfaces meet the roof plane. Flashing acts as a water shield, preventing leaks and damage by directing water toward the gutters.

Common Flashing Locations:

  • Chimneys

  • Skylights

  • Roof vents

  • Valleys

  • Dormers

Common Problems Caused by Faulty Flashing

Faulty flashing can lead to significant issues, including:

  • Compromised structural integrity

  • Mildew build-up

  • Ideal conditions for pests

Key Takeaway

Properly installed and maintained roof flashing is essential to keep water out and prevent damage.

Types of Roof Flashings

Step Flashing

Step flashing consists of a series of metal pieces layered with shingles, ensuring water cannot seep into your home. Each piece overlaps the one below it, directing water onto the shingle below.

Valley Flashing

Valley flashing manages water flow in roof valleys, ensuring rainwater is safely channeled off the roof.

Chimney and Skylight Flashing

Proper flashing around chimneys and skylights prevents leaks. Layers of base and counter flashings ensure a watertight seal.

Counter Flashing

Installed in the opposite direction of other flashings, counter flashing adds another layer of water protection.

Gutter Apron Flashing

This L-shaped piece redirects water away from the roof edge and into the gutters, protecting the fascia and foundation.

Drip Edge Flashing

Drip edge flashing directs water away from the fascia board and into the gutters, preventing water damage to the roof edge.

Key Takeaway

Different types of flashing, such as step, valley, and drip edge flashing, play specific roles in keeping your roof watertight.

How Much Does it Cost to Repair Roof Flashing?

Repair costs range from $200 to $500, while replacement can cost between $300 and $1,500. Catching issues early can save money.

Repair vs. Replace

Minor issues can often be repaired, but replacement may be necessary for extensive damage.

Save Money by Choosing the Right Materials

Metal options like stainless steel and copper are durable and resistant to corrosion, while plastic and rubber are more flexible and cost-effective.

Key Takeaway

Choosing the right materials and addressing issues early can save money and ensure long-term protection.

How to Choose the Right Material for Roof Flashing

Metal Flashings

  • Stainless Steel: Highly durable and resistant to corrosion.

  • Copper: Naturally anti-corrosive and aesthetically pleasing.

  • Galvanized Steel: Affordable and resilient with a zinc coating.