Roof flashing is one of the most critical components of any roofing system. While shingles protect large surfaces, flashing protects the vulnerable areas where leaks most often occur.

Flashing is thin metal installed around roof penetrations and transitions to direct water away from seams and joints.

Where Flashing Is Installed

Flashing is typically installed around:

• Chimneys

• Skylights

• Roof-to-wall transitions

• Roof valleys

• Plumbing vents

• Dormers

These areas are the most common leak points on any roof.

Why Flashing Is So Important

Water always finds the path of least resistance. Anywhere your roof changes direction or has an opening becomes a potential entry point.

Flashing creates a waterproof barrier that forces water to flow safely off the roof instead of into your home.

Types of Roof Flashing

Step Flashing – Installed along walls and roof intersections

Valley Flashing – Protects roof valleys

Chimney Flashing – Seals chimney penetration

Vent Flashing – Seals plumbing vents and pipes

Signs Flashing Has Failed

• Leaks near walls or chimneys

• Rust or corrosion

• Loose or missing metal pieces

• Interior ceiling stains near roof transitions

Roofer Pro Tip

Many roof leaks are flashing failures — not shingle failures.