Metal roofs are a durable, long-lasting solution for many Wisconsin homes and businesses. However, even the sturdiest metal roofs may rust over time, especially when exposed to the harsh weather in the Badger State.
A rusted metal roofing system is characterized by reddish-brown or flaking spots on metal surfaces. This isn’t just unattractive, it can compromise your roof’s structural integrity, leading to leaks, higher repair costs, and potentially the need for a full replacement.
If your home has had a metal roof for years, it might have rust on it. But don’t panic! This guide will walk you through why rust forms, what you can do to address it, and how to prevent it in the future. As a trusted roofing company serving Wisconsin, we’re here to ensure your roof stays strong and beautiful for years to come.
Why Do Metal Roofs Rust?

Rust forms when metal, specifically steel or other iron alloys, is exposed to moisture and oxygen, resulting in a chemical reaction that degrades the material. Several factors can lead to rust on your metal roof:
- Exposure to Moisture: Wisconsin’s harsh winters, heavy snow, and rainy springs create the perfect environment for moisture to linger on your roof. This is one reason why roof maintenance is so important.
- Low-Quality Materials: Cheaper metals or poorly applied roof coatings are more prone to rusting as they wear out faster.
- Poor Maintenance: Debris buildup, clogged gutters, and neglected paint jobs can trap water against your roof’s surface, accelerating rust formation.
- Scratches and Damage: Any damage to the protective coating on your metal roof exposes the underlying metal to the elements, inviting rust.
Understanding the cause of rust is the first step in addressing it effectively.
What to Do About A Rusted Metal Roof
If your metal roof is showing signs of rust, acting quickly can save you time and money. Here’s how to tackle rusting metal roofs.
Inspect the Roof Damage
Start by assessing the rusted areas. Is the rust surface-level, or has it eaten through the metal? Or has your metal roof started corroding? Small rust spots are manageable, but widespread or severe rust may require help from a professional roofing company like ours. Look for the following signs :
- Rust spots and streaks.
- Bubbling or flaking paint.
- Holes or weak spots in the metal roof panels
If you are inspecting the roof yourself, ask a friend or a family member for help and take safety precautions before you climb on your roof. Otherwise, hiring a professional for a metal roof inspection is always a good idea.
Clean the Affected Area
Before making any repairs, you should start by cleaning the rusted area first. This step ensures that repair materials adhere properly and prevents rust from spreading.
To clean your metal roof, you will need the following tools: A wire brush, sandpaper, mild detergent, and water.
Start with scrubbing off rust with a wire brush and sandpaper, clean the area with detergent, and rinse with water. Let it dry completely before proceeding further.
Repairing Small Rust Spots
For minor rust damage on metal roofs, patching offers a cost-effective and reliable solution that can extend your roof’s lifespan.
- Start by thoroughly cleaning the affected area to remove loose rust and debris.
- Next, apply a rust converter – this chemical treatment transforms rust into a stable black compound that prevents further corrosion. Allow the converter to dry completely according to the manufacturer’s instructions.
- Once dried, apply a high-quality metal roofing sealant in thin, even layers. The sealant creates a waterproof barrier that prevents moisture from reaching the treated area.
- For the best aesthetic results, consider applying rust-resistant paint that matches your roof’s color once the sealant has fully cured.
This final step not only helps the repair blend seamlessly with the surrounding roof but also adds an extra layer of protection against future rust formation.
Replace Severely Damaged Panels
If the rust has penetrated the metal causing holes or compromising the roof’s structure, the affected panels may need replacing. This process involves:
- Removing the damaged panel.
- Installing a new panel of the same material and size.
- Sealing and securing the new panel to ensure a watertight fit.
Apply Protective Coatings
After repairing rusted areas, consider adding a protective coating to your entire roof. Products like rust-resistant paint or sealants act as a barrier against moisture, prolonging the life of your roof.
DIY vs. Professional Help
While some rust repairs can be done yourself, significant damage or large-scale rust problems are best left to professionals. An expert can ensure the job is done safely and effectively, saving you from headaches down the road.
Tips for Preventing Rust on Metal Roofs
Rust prevention is far easier—and cheaper—than repair. With regular maintenance and the right protective measures, you can keep your metal roof in top condition for decades.
Routine Inspections and Maintenance
Inspect your roof at least twice a year, ideally in spring and fall. Look for signs of rust, damage, or debris buildup. Promptly address any issues to prevent rust from taking hold.
Keep Your Roof Clean

Dirt, leaves, and other debris trap moisture against the roof’s surface. Regularly cleaning your roof and gutters minimizes the risk of rust forming.
Apply Protective Coatings
Invest in high-quality paint or a weather-resistant coating for your metal roof. These products create a barrier against moisture, reducing the likelihood of rust.
Choose Quality Materials and Installation
When installing or replacing a metal roof, opt for high-grade materials with factory-applied protective coatings. Professional installation ensures that your roof is sealed correctly, further reducing the risk of rust.
Manage Wisconsin Weather
Wisconsin’s climate is tough on roofs. Snow and ice can accumulate, trapping moisture against the metal. Clear your roof of heavy snow when possible and ensure your attic has proper ventilation to reduce the risk of ice dams.
Best Materials For Your New Metal Roof
If there is excessive rust on the metal roof or it has started to corrode, it is time to replace the metal roof panels. Fortunately, there are plenty of material options available:
Galvanized Steel
Galvanized steel is a popular choice for metal roofing systems due to its durability and resistance to corrosion. The steel is coated with a layer of zinc, which provides a protective barrier against rust. This type of metal roof is not only cost-effective but also offers a sturdy solution that can last for decades when properly maintained
Aluminum

Aluminum is lightweight and highly resistant to corrosion. It is also energy-efficient, as it reflects solar heat, helping to keep the interior of buildings cooler. Furthermore, aluminum can be painted or coated in various colors
Also Read: 5 Popular Metal Roof Colors Of 2025
Copper

Copper roofs are renowned for their beauty and longevity, often lasting over a century when well-maintained. They develop a green patina over time, which not only adds to their character but also provides a protective layer against corrosion.
Also Read: Your Guide to the Latest Metal Roof Types and Styles in 2024
Damaged Roof? Install A New Metal Roof In Wisconsin Today
A roof that reduces curb appeal and is not able to withstand the weather conditions of the area needs to be replaced. If your roof is also rusted, dented, or corroded, and you are looking for metal roof replacement, look no further than Prestige Roofing LLC.
With years of local experience and great customer service, our roofers are here to take care of your roof. Contact us today at (920) 791-0414.