Rust on Roofing: Why It Happens & How To Prevent
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Rust on Roofing: Why It Happens & How To Prevent
Metal roofs are the envy of the industry for their durability, lifespan, and modern looks. Even so, the most resilient materials cannot resist one formidable foe: rust. Whether you have a metal roof or are thinking of one, it's vital to know what causes rust, how to avoid it, and what to do if you see it to protect your investment.
What Should You Do If You Spot a Rust on Metal Roofing Issue?
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What is Rust, and Why Does It Matter for Metal Roofs?
Metal roofs rust due to a chemical reaction—oxidation—between iron, oxygen, and humidity. When metal comes into contact with water (even air-borne humidity), it corrodes over time, forming iron oxide. Further corrosion destroys structural integrity on roofing structures, resulting in repair expenses, lost energy efficiency, and, in extreme cases, complete roof failure.
Most contemporary metal roofing has protective coatings (such as galvanization or paint systems) that slow this reaction. These coatings can be compromised, enabling rust to form underneath the roof surface.
Signs Your Roof is Beginning to Rust
The sooner you detect roof rust, the greater your chances of avoiding extensive damage to the roof. Watch for these warning signs when you do a roof inspection:
- Reddish-brown spots or streaks on the metal panels.
- Blistered or bubbly paint that points to corrosion underlying the coating.
- Rust beads in the direction of fasteners, screws, and seams.
- Rust-through attics or ceilings resulting from holes eaten out by rust.
- Peeling or flaking metal in the edges, ridges, and flashings.
- Fading near drains or gutters where water converges.
- Sporadic checking after storms facilitates the discovery of such indicators before they escalate to widespread roof rust.
How Rust Affects the Roofing Function
Rust isn't only ugly - it gradually seeps into your roofing system's performance. This is what untreated corrosion can cause if not detected during roof inspection:
Weakens the Structure
While rust consumes the metal roofing, it weakens the panels and causes structural damage. Eventually, this erodes the strength of the roof and building structure. Panels can collapse or become detached in extreme cases.
A Leaking Roof is more likely
Rust can corrode fasteners and seams, creating small holes that allow water to enter. These leaks might not be apparent initially, but they can lead to mold growth, compromised insulation, rotting wood, and destroyed ceilings or walls.
Damaged Shingles
Rust from its top can leach down into shingles and damage them, prompting cracking, curling, or aging faster, especially in cases where metal components, say a flashing or nails, corrode while continually wet. This damages shingles nearby, causing them to leak, lose granules, and decrease weather protection. Fortunately, with regular checks, good roof ventilation, and rust-resistant roofing materials, you can help prevent this and continue protecting your roof for years.
Depreciated Property Value
A rust-colored roof sends a warning sign to home buyers. It indicates neglect and future roof repair expenses, making your property more difficult to sell and less appealing from the curb.
