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Cut-Edge Corrosion: The Hidden Threat to Your Roof and Why Immediate Repair is Essential

Your building’s roof is its first line of defense against the elements, protecting your valuable assets and ensuring a safe environment for occupants. However, one often overlooked and insidious enemy of roofing systems is cut-edge corrosion. In this blog post, we’ll delve into what cut-edge corrosion is, what causes it, and why it’s absolutely imperative to have it fixed as soon as possible.

Understanding Cut-Edge Corrosion

Cut-edge corrosion, also known as edge peel corrosion, primarily affects metal roofs with coated steel or aluminum sheets. It occurs along the cut edges of these sheets, where the protective coating has been compromised during the installation process or due to wear and tear over time. When this coating is compromised, the metal beneath becomes vulnerable to the corrosive effects of the environment.

What Causes Cut-Edge Corrosion?

Installation Deficiencies:

Cut-edge corrosion often begins at the edges of metal roofing sheets where they are cut during installation. If not properly sealed and protected, these exposed edges become susceptible to moisture infiltration, which initiates the corrosion process.


Over time, exposure to various weather conditions, including rain, snow, and UV radiation, can wear down the protective coating on the roof’s edges. This gradual deterioration leaves the metal vulnerable to corrosion.


Condensation can form on the underside of metal roofing sheets, particularly in climates with temperature fluctuations. The moisture created by condensation can migrate to the cut edges, accelerating the corrosion process.

Why Immediate Repair is Imperative

Structural Integrity:

Cut-edge corrosion compromises the structural integrity of your roofing system. As the corrosion progresses, it weakens the affected metal, making it susceptible to further damage. Left unchecked, it can lead to leaks and even structural failure.

Cost-Effective Solution:

Addressing cut-edge corrosion promptly is cost-effective. Early detection and repair can prevent the need for extensive, costly roof replacements. The longer you wait, the more extensive and expensive the repairs become.

Protecting Assets:

Your building’s contents and assets are at risk when cut-edge corrosion is left untreated. Leaks resulting from corroded roofing can damage equipment, inventory, and the building’s interior, resulting in substantial financial losses.

Energy Efficiency:

A corroded roof is less energy-efficient. It can allow heat to escape during the winter and hot air to enter during the summer, increasing heating and cooling costs. A well-maintained roof, on the other hand, contributes to energy savings.

Safety Concerns:

A deteriorating roof poses safety concerns for building occupants. Water infiltration can lead to slippery surfaces, mold growth, and other hazards that can jeopardize the well-being of those inside.


Cut-edge corrosion is a silent threat to the longevity and functionality of your roofing system. It may start small, but if left unaddressed, it can wreak havoc on your building, finances, and operations. Regular roof inspections, especially for aging metal roofs, are crucial to detecting and addressing cut-edge corrosion early.

Investing in prompt repairs is not just about safeguarding your roof; it’s about protecting your entire business. It ensures the structural integrity of your building, reduces long-term maintenance costs, and helps you maintain a safe, energy-efficient, and comfortable environment for everyone. Don’t delay – tackle cut-edge corrosion head-on to secure the future of your roof and your business.