How do you handle valleys and flashing on metal roofs?

How We Handle Valleys and Flashing on Metal Roofs (and Why It Matters)

When it comes to metal roofing, homeowners often focus on the panels. But what really keeps your home watertight?
The valleys and flashing.

At L&L Roofing & Construction, we pay extra attention to these areas because most roof leaks start at weak or improperly installed joints—not in the middle of the panels.

Here’s how we handle valleys and flashing the right way on metal roofs across Gainesville, Buford, Dawsonville, and surrounding areas.

FAQ: How do you handle valleys and flashing on metal roofs?

🔧 What Are Roof Valleys and Why Do They Matter?

Valleys are where two roof planes meet and form a channel. Water flows through these spots during every rainfall, which means:

• Valleys handle more water volume than any other part of the roof

• If not flashed properly, they become leak-prone over time

🛡️ How We Flash Roof Valleys the Right Way

At L&L Roofing, we follow best practices backed by manufacturer standards and building codes:

✅ W-Style or Hemmed Open Valleys

• Allows fast water flow without backup

• Panels cut cleanly and hemmed for no exposed edges

• No exposed fasteners in the valley itself (prevents rust)

✅ Underlayment Protection

• Ice & water shield or high-temp underlayment runs the full length of the valley

• Protects against wind-driven rain and backup under heavy flow

✅ Proper Overlaps and Sealing

• All valley panels and intersecting sections are sealed with butyl tape or sealant

• Mechanically fastened for long-term strength without relying solely on caulk

🏠 How We Handle Flashing Around Penetrations

Flashing is the metal trim that seals areas like:

• Chimneys

• Skylights

• Pipes and vents

• Walls and dormers

Our approach:

• Custom-bent flashing to fit your roof's exact dimensions

• Use of closure strips and foam blocks where needed

• Hidden fasteners when possible for a cleaner look and longer life

• Never reusing old flashing—we install brand-new, color-matched components

FAQs: Metal Roofing Valleys and Flashing

Q: Can improper flashing cause roof leaks?
A: Yes—most metal roof leaks start where flashing is missing or poorly sealed. That’s why proper valley and flashing work is non-negotiable in our installs.

Q: Do you use caulk to seal flashing?
A: Only as backup. We rely on mechanical overlaps and sealant tape, not just caulk, for long-term protection.

Q: Will the flashing match my roof color?
A: Yes. All flashing is either factory-painted to match your panel or custom-fabricated on-site with the same finish and color.

Q: How long will flashing last on a metal roof?
A: With proper materials and installation, flashing should last as long as the metal roof—40 to 70 years.

We Don’t Cut Corners—Especially in the Details

Valleys and flashing may not be the first thing you notice—but they’re the first thing that fails when rushed or done wrong.

At L&L Roofing, we treat these components as mission-critical—because you deserve a roof that doesn’t just look good, but lasts decades without leaks.

📞 Need a leak-resistant metal roof built the right way from day one?
Call (770) 874-0372 or request a free estimate at www.llroofs.com