Roof flashing might not be the most glamorous part of your roof, but let me tell you—it’s the MVP in keeping your home dry and protected. Flashing is that thin material (usually metal) installed around roof features like chimneys, vents, and skylights to direct water away from those vulnerable areas. When it’s working, you don’t even think about it. But when it fails? You’re looking at leaks, water damage, and a whole lot of frustration.
So, let’s dive into how to spot and fix common roof flashing issues before they turn into bigger problems.
First, let’s get clear on what flashing does. Think of it as your roof’s waterproof armor. It seals the joints and edges where water is most likely to sneak in—like where the roof meets a wall, or around chimneys and skylights. Without proper flashing, even the best roof can’t keep water out.
Cracked or Corroded Flashing
Over time, flashing can crack, rust, or corrode, especially if it’s made of lower-quality materials. This is common in older homes or roofs exposed to harsh weather conditions. Once the flashing is compromised, water can seep in and cause damage.
How to Spot It:
Loose or Missing Flashing
High winds, heavy storms, or poor installation can cause flashing to come loose or even go missing entirely. When this happens, water has a direct path into your home.
How to Spot It:
Improper Installation
Not all roofers are created equal, and unfortunately, some cut corners when it comes to flashing. Improperly installed flashing can leave gaps, overlaps, or exposed edges that allow water to sneak in.
How to Spot It:
Sealant Failure
Flashing is often sealed with caulk or roofing cement to create a watertight barrier. Over time, this sealant can dry out, crack, or peel away, leaving the flashing vulnerable.
How to Spot It:
Replace Damaged Flashing
If your flashing is cracked, corroded, or missing, it’s time for a replacement. This involves removing the old flashing, cleaning the area, and installing new flashing that fits snugly and securely.
Pro Tip: Use high-quality materials like aluminum or galvanized steel for durability. And if you’re near the ocean, consider copper flashing to resist salt spray corrosion 4.
Reattach Loose Flashing
For flashing that’s come loose, you’ll need to secure it back in place with roofing nails or screws. Be sure to seal the edges with roofing cement to prevent water from sneaking in.
Quick Tip: Always nail flashing into the roof deck, not the shingles, to avoid creating new vulnerabilities.
Reseal Flashing Edges
If the sealant around your flashing has failed, remove the old caulk or cement and apply a fresh layer. Use a high-quality roofing sealant designed to withstand extreme weather conditions.
Pro Tip: Don’t skimp on the sealant—this is your first line of defense against leaks.
Call in the Pros
If you’re not comfortable working on your roof or the issue is more extensive, don’t hesitate to call a professional. A skilled roofer can assess the problem, recommend the best solution, and ensure the repair is done right the first time.
Roof flashing might not be the most exciting part of your home, but it’s one of the most important. By knowing how to spot and fix common issues, you can protect your home from leaks, water damage, and costly repairs. And if you’re ever in doubt, don’t hesitate to call in the pros—your roof (and your wallet) will thank you.
At MARASUN, we’re all about helping homeowners keep their roofs in top shape. Whether you need a flashing repair, a full inspection, or just some expert advice, we’ve got you covered. Contact us today to schedule a consultation and let’s make sure your roof is ready to handle whatever Mother Nature throws its way.