Why Every Roof Component Matters When Replacing Your Roof (Part 2):
This series is important, as nobody wants to be scammed. Again, we’ve all had a “roofer” knock on the door, mention hail damage, and start speaking another language while pointing vaguely at the roof. Vents, drip edge… and what is flashing?
At Roofing Louisiana, we offer all our customers the Red Carpet Experience, which includes covering the truth about your roof and our replacement process.
Of course, everyone knows shingles. If you read our last post, you now understand roof sheathing (or decking). The top and bottom layers of the complete roof system are important, but so are the rest of the components, like flashing. Every component of your roof system works together to protect your home. You’ll only get a full life out of your roof if you don’t cut corners.
Who really knows what is flashing—really?
If you better understand the purpose of flashing, and make sure it’s replaced when your roof is replaced, you’ll avoid bigger problems down the road.
What is flashing?
Flashing is a thin, water-resistant material—usually galvanized steel, aluminum, or sometimes copper—that acts as a barrier. It’s installed at every seam or joint, where the roof meets a wall, on dormers, around chimneys, and other vulnerable areas. Its purpose is to direct water away from potential entry points.
Let’s also be clear what it is NOT.
When many contractors say flashing, they include lead jacks and roof pipes, which are also metal. Using this trick, they won’t replace your roof/wall, roof/chimney, or drip edge (stay tuned for the next Roof Component blog posts).
This is one way they can cut corners and offer cheaper quotes. BUT BEWARE! Flashing is a key part of the complete roof system.
What is flashing’s importance?
Down here in Cajun Country, we’ve all experienced a heavy Louisiana downpour. You know what I mean… when rain seems to fall in buckets rather than drops. Looking out the window, you may have a passing thought of Noah as you watch water cascading off your eaves and gushing out of your gutters. Now, consider those spots where your roof meets vertical surfaces—like chimneys, vents, skylights, and dormers? That’s where roof flashing comes in.
Without properly installed or well-maintained flashing, even the best shingles can’t stop water from sneaking into your home. Even a tiny pinhole in rusted flashing left unchecked during a Louisiana hurricane can be an issue. Next thing you know, you’re scrambling to find buckets, acting like a circus performer, catching drips in your living room.
Why Replacing Flashing Matters During a Roof Replacement
Now that you’ve answered, “What is flashing?” and you know why it’s important, you still may be tempted to save money when those replacement quotes start coming in. Shady contractors cut corners to offer cheaper upfront quotes. They may only replace your shingles, as they don’t have the expertise to replace the rest. Though this may look fine from the ground, here’s why that’s a risky shortcut:
1. Hidden Damage
Over time, flashing can corrode, warp, or crack—especially in our humid, storm-prone climate. You simply can’t assess its true condition without stripping the shingles and underlayment. Replacing roof flashing only when it’s already failed is like repairing a leaky pipe after your ceiling has caved in.
Competent contractors strip to the decking—or roof sheathing—to make sure your new roof isn’t being installed on a compromised foundation. Even if flashing still looks flashy, you can’t see potential hidden damage without removing it. Our installers have removed perfectly nice-looking flashing with major rust on the underside. Though a shady contractor may have left it, it wouldn’t take long for that to cause leaks, not to mention, well, that’s the next point…
2. Manufacturer Requirements
Most shingle manufacturers state that neglecting flashing replacement voids your warranty. If a future windstorm or hail event damages your roof, you want the peace of mind that comes with a full manufacturer’s warranty. That means every component, including flashing, must be installed correctly.
3. Seamless Integration
What is flashing’s main purpose? Seamless Integration. A complete roof system isn’t just shingles, underlayment, and decking. Flashing is the glue that ties everything together. It’s that extra shield in the most suspect areas. Every roof flashing component is custom-fitted during a full replacement.
Competent roofers, like Roofing Louisiana, employ trained metal specialists to custom-make your roof’s flashing. Not having that trained expert or not knowing how to properly install flashing can be equally problematic.
When you replace flashing alongside other components—like underlayment, drip edge, and ventilation—you ensure each layer works in harmony. That synergy maximizes the lifespan and performance of your new roof.
What is Flashing’s Role in a Complete Roof System?
At Roofing Louisiana, we always replace complete roof systems. When you replace every one of these components—including roof flashing—you’re investing in a system engineered to withstand local weather extremes: from scorching sun to Category 4 hurricanes. Neglect just one piece, and the weakest link can compromise everything above it.
Why would you invest thousands of dollars in a brand-new roof, only to install it over 20-year-old metal? Faulty flashing is one of the leading causes of roof leaks after a replacement. Homeowners stuck in this situation will not only have to pay for a flashing replacement, but new shingles around the flashing—essentially paying twice for shingles. Doing things right the first time is always the best decision.
Signs Your Flashing Needs Replacement
How do you know if your flashing is past its prime? What is flashing red flags? Here are a few:
- Rust or Corrosion: Metal flashing that’s discolored, powdery, or flaking means it can’t redirect water properly.
- Cracks, Warping, or Gaps: Even small separations at seams can allow wind-driven rain to infiltrate your attic.
- Loose or Missing Sections: If flashing has shifted or pieces are missing, you’re asking for leaks.
- Interior Water Stains: Stains on your ceiling or walls often point to flashing failures around chimneys or roof intersections.
Catching these issues early saves you from emergency repairs later. Replacing the flashing doesn’t require a full roof replacement, but…
Peace of Mind with a Full Replacement
At the end of the day, investing in a complete roof system—flashing, underlayment, decking, and all—means you’re not just patching a problem. You’re setting your home up for decades of protection. Your roof becomes a fortress against water intrusion, energy loss, and structural damage.
Our level of attention is why we are an Owens Corning Platinum Contractor and why homeowners trust us to deliver the ultimate protection.
Now you know the answer to, “What is flashing?” Schedule a free consultation with Roofing Louisiana today. We’ll show you exactly why a complete roof system replacement empowers your home to stand strong against Louisiana’s toughest weather.
And stay tuned to learn more about each component of a full roof system…
