Metal roofs are popular for their durability, sleek appearance, and impressive longevity. I mean, they are pretty chic, right? However, like anything exposed to the elements over time, even metal roofs aren’t immune to wear and tear. One of the most common issues? Rust.
If you’ve spotted some reddish-brown patches or noticed weakened areas on your metal roof, don’t panic. At RoofCrafters, we've been installing, repairing, and maintaining metal roofs for over 30 years, and we know a thing or two about the remedy.
So, if you're the proud owner of one of these bad boys, and you're looking for some tips on eradicating rust once and for all, you're in the right place! Stick around to learn what you need to know about rust on metal roofs and, more importantly, what steps you can take to address it. Let's get started!
Why Do Metal Roofs Rust?
To understand why metal roofs rust, it’s helpful to get a sense of the metal roofing process and materials. Most metal roofs are made of steel or aluminum and coated with protective layers like zinc or special paint to guard against corrosion. However, over time, exposure to moisture, pollutants, and environmental factors can wear down these protective layers, allowing rust to set in.
Common causes of rust on metal roofs include:
• Weather exposure: Heavy rain, snow, and salty sea air (for homes near the coast) can break down protective coatings.
• Improper installation: If the roof wasn’t installed correctly, small gaps or exposed edges could be vulnerable to rust.
• Poor maintenance: Regular cleaning and inspection are essential to ensure the protective layers remain intact.
Step 1: Assess the Damage
Before diving into repairs, it’s essential to assess the extent of the rust. Take a look at your roof from a safe vantage point or call in a professional if you’re unsure. Ask yourself these 3 questions:
- Has the rust spread across a large area, or is it isolated to specific spots?
- Has the rust caused visible holes or structural weakness?
- Does the roof feel fragile or compromised when you inspect it up close?
A small rust patch here and there is often manageable, but widespread rust could be a sign that deeper repairs or even a replacement may be necessary.
Step 2: Clean and Remove Rust
Once you’ve assessed the damage, the next step is to clean the affected areas. Removing rust promptly can prevent it from spreading and potentially extending the lifespan of your roof. Here’s a quick guide on rust removal:
Scrub the area: Use a wire brush or sandpaper to scrub the rusty spots. Be gentle enough to avoid damaging the metal, but thorough enough to remove as much rust as possible.
Rinse: After scrubbing, rinse the area with water to remove any residue or loose particles.
Dry completely: Make sure the area is completely dry before moving on to the next step. Moisture trapped under a new layer of coating could cause further rust.
Pro tip: For large-scale rust issues, it’s best to call a professional who can safely clean the roof and ensure that no patches are missed.
Step 3: Apply a Rust Converter
A rust converter is a chemical solution designed to stop rust in its tracks. When applied to a rusted surface, it converts the iron oxide (rust) into a more stable, non-rusting compound. Applying a rust converter is a relatively straightforward process. You start by preparing the surface and making sure it's clean and dry.
From there, follow the instructions! Different rust converters have different application methods, so it’s essential to follow the manufacturer’s instructions. Then, give the converter time to work its magic. This step helps ensure the rust won’t continue spreading underneath any future coatings.
Using a rust converter is a quick fix and can significantly extend the life of your metal roof if the rust is caught early. However, the RoofCrafters team strongly recommends against roofing DIY projects, as it's better to let a professional lend a helping hand!
Step 4: Seal and Recoat
At this point, if you haven't called in a professional, it's time to treat the rust, it’s time to re-seal and protect your roof. A sealant or metal roof paint can act as a barrier against future moisture and environmental wear. Look for products specifically designed for metal roofs, ideally those with rust-inhibiting properties.
Then, use a roller, sprayer, or brush, depending on the product, and ensure an even coat across the entire surface. Always be sure to allow adequate drying time to ensure the sealant bonds well with the metal! Re-coating your roof can protect it from future rust, but make sure to choose a high-quality product that will hold up to the elements.
Step 5: Schedule Regular Maintenance
Prevention is always better than cure, and regular maintenance can go a long way in keeping your metal roof rust-free. Schedule a roof inspection at least once a year, especially if you live in a harsh climate. A professional can spot early signs of rust or damage that may not be visible from the ground.
Also, keeping your roof clean can work wonders! Debris, leaves, and dirt can trap moisture against the metal, encouraging rust. Regularly clean your roof, especially after heavy storms. If you start to notice any scratches, dings, or exposed metal spots, touch them up with a rust-inhibiting paint or sealant.
When to Call a Professional
While DIY maintenance can address minor rust issues, more extensive rust damage should be left to professionals. Here’s when to consider calling an expert:
• Widespread rust: If the rust covers large sections of your roof, it may be more cost-effective and safer to let professionals handle it.
• Structural damage: Rust can weaken the metal, causing holes or sagging. If the roof structure seems compromised, a professional can determine whether repairs or a full replacement are needed.
• Unfamiliar with metal roofing: If you’re unsure about the tools or techniques, it’s safer and more efficient to get expert help.
Options for Severe Rust Damage
In some cases, rust damage may be too severe to repair, and replacement may be the best option. But don’t worry, there are still plenty of choices if you’re looking to invest in a new metal roof. You should consider:
• Galvanized steel: This option has a protective zinc coating, making it more resistant to rust than regular steel.
• Aluminum: Aluminum is naturally resistant to rust and corrosion, making it a good choice for coastal homes.
• Standing seam metal roofs: These have fewer exposed seams, reducing the chances of rust setting in along panel edges.
While replacing a roof is an investment, it could ultimately save you money in maintenance and repairs in the long run.
Don’t Let Rust Get You Down
Rust on a metal roof is a common issue, but it doesn’t have to spell disaster. By taking early action, cleaning and treating rust, and committing to regular maintenance, you can keep your metal roof looking great and performing well for years to come.
Whether you’re a DIY enthusiast ready to tackle minor rust patches or someone looking for professional help, there’s always a solution.
And remember: a little bit of rust doesn’t mean your metal roof has lost its value, it just needs a little extra care to get back to its best. Hit that "Schedule an Inspection" button down below and give your metal roof the TLC it needs!
