Metal roofing is one of the most durable and long-lasting roofing options available—especially in Dallas–Fort Worth and East Texas, where homes and buildings are constantly exposed to sun, rain, hail, and humidity. But despite its toughness, one thing metal roofs can be vulnerable to over time is rust.
At Shepherd Metal Roofing, we specialize in metal roof installation and maintenance—and we know that rust is not inevitable. With the right care, coatings, and materials, you can extend the life of your metal roof by decades.
In this post, we’ll explore what causes rust, how to prevent it, and what to do if your roof is already showing signs of corrosion.
Why Does Rust Form on Metal Roofs?
Rust is a form of corrosion that occurs when iron or steel reacts with water and oxygen over time. In roofing, this typically shows up as:
- Orange or brown spots
- Flaking or bubbling paint
- Weakening fasteners or seams
In Texas, high humidity, wind-driven rain, and large temperature swings can accelerate this oxidation process—especially if the protective coatings on your roof become damaged or worn.
Check out here on Top Benefits of a Metal Roof in Texas ->
Common Causes of Rust on Metal Roofs
- Scratches or Damage to Protective Coating
Factory-finished panels usually come with a galvanized (zinc) or painted coating. When this coating is scratched during installation or from falling debris, it leaves the metal underneath vulnerable to moisture. - Standing Water or Debris
Leaves, pine needles, and dirt can trap moisture on the roof surface, creating conditions for rust to form underneath. - Galvanic Corrosion
Mixing incompatible metals (like copper and steel) can trigger corrosion, especially in fasteners and flashing. - Poor Installation or Maintenance
Gaps around fasteners, missing sealant, or improper flashing can let water seep into areas that are hard to dry out.
3 Ways to Prevent Rust on Your Metal Roof
1. Choose Rust-Resistant Materials
If you’re building or replacing a metal roof, start by choosing the right type of material:
- Galvalume® steel (aluminum-zinc alloy coating) resists corrosion better than standard galvanized steel.
- Aluminum roofing won’t rust at all, making it ideal for humid or coastal regions.
- Standing seam metal roofing, which hides fasteners under panels, is less vulnerable to moisture intrusion.
At Shepherd Metal Roofing, we install high-quality standing seam and R-panel roofs designed specifically for Texas weather.
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2. Apply Protective Coatings and Sealants
Modern metal roofing systems are often finished with:
- Kynar 500® or PVDF coatings: Fade- and corrosion-resistant paint finishes
- Acrylic or silicone sealants around seams and flashings
- Elastomeric roof coatings for older metal roofs needing extra protection
Over time, it’s a good idea to have your roof resealed or recoated to maintain that protective barrier.
3. Keep It Clean and Clear
One of the simplest ways to prevent rust is with routine maintenance:
- Remove debris like leaves or twigs, especially in valleys and low-slope sections
- Keep gutters clear to prevent water from backing up onto panels
- Trim overhanging trees to prevent scratches and debris buildup
Curious about the difference between Standing Seam vs R-Panel Metal Roof? Check out this blog ->
4. Schedule Regular Inspections
We recommend having your roof professionally inspected at least once a year, especially after major storms. At Shepherd Metal Roofing, our inspections check for:
- Exposed fasteners
- Worn or missing sealant
- Panel damage or lifting
- Areas of ponding water
- Early signs of rust or corrosion
Catching small issues early can prevent expensive repairs—or a full roof replacement—later on.
Already Noticing Rust?
If you see rust spots forming on your roof, don’t wait. Early rust can often be cleaned, primed, and sealed, but severe corrosion can compromise the structural integrity of your roof panels.
We can help you decide whether a repair, partial panel replacement, or full recoating is the best option for your roof. Schedule an inspection today!
Why Work With Shepherd Metal Roofing?
We’re proud to serve Dallas–Fort Worth and East Texas with expert metal roofing solutions built to last. Whether you need a brand-new standing seam metal roof or want to protect the one you already have, we provide:
✅ Free roof inspections
✅ High-temp sealant and fastener upgrades
✅ Certified metal roof coatings
✅ Storm damage repair
✅ Standing seam and R-panel installations
Schedule a Free Metal Roof Evaluation
Rust doesn’t have to ruin your roof. Let our experienced team help you protect your home or building from corrosion and weather damage.
📞 Call Shepherd Metal Roofing at (972) 256-8817
🌐 Visit www.shepherdmetalroofing.com
📍 Proudly serving Dallas, Fort Worth, Tyler, Longview, Waxahachie, and beyond