What is cut edge corrosion and how can you fix it

Cut edge corrosion is a common issue affecting metal roofs across the UK, particularly in the commercial and industrial sectors. Despite it being quite a common issue, many building owners and facilities managers are unaware of the damage it can cause and the steps needed to address it effectively.

Understanding Cut Edge Corrosion

Metal roofs are often coated with a protective layer to guard against the elements, however at the edges of the metal sheets where they are cut either during manufacturing or installation, this protective coating can be thinner or even absent, leaving the bare metal exposed.

Over time, exposure to the UK’s wet and windy weather causes the unprotected edges to corrode. This corrosion can spread beneath the protective coating, weakening the roof’s structural integrity and leading to leaks, rust staining, and eventual failure if left unaddressed.

What to look out for

You may notice peeling or lifting of the protective coating, particularly at sheet overlaps or edges, where the coating is more vulnerable. Discolouration or rust stains around these areas are another common sign of corrosion while water ingress will look like stains or damp patches inside the building.

In some cases, you may observe bubbling or blistering of paint near the edges, indicating trapped moisture and underlying corrosion. Corroded metal edges can also cause debris to accumulate in gutters and drainage systems, so regular maintenance of these areas may provide an early clue.

Regular roof inspections or Drone Surveys are an excellent method for identifying these issues on larger commercial and industrial roofs. Equipped with high-resolution cameras and thermographic imaging, drones can safely inspect even the most challenging areas and provide detailed insights into your roof’s condition.

Prevention can be cheaper than the cure

Preventing cut-edge corrosion is far more cost-effective than dealing with the consequences of advanced damage. Regular roof inspections, whether conducted on-roof or through professional drone surveys, can help identify early signs of wear and tear.

Applying protective coatings during installation or routine maintenance ensures the edges are shielded from environmental exposure. Keeping gutters and drainage systems clear helps minimise water pooling, which can accelerate corrosion. Proactive cleaning and maintenance, combined with professional inspections, are key to prolonging the life of your roof and avoiding costly repairs.

How to fix cut edge corrosion?

If you are having problems with the metal roof and you think it's cut-edge corrosion that's causing the problems, the first step would be to book a roof assessment by one of our technical services team. They will perform a site survey to assess the condition of the roof and will provide a comprehensive condition report detailing their technical analysis and findings from the visit.

Allbase offers a range of advanced liquid applied roofing systems for tackling cut edge corrosion, each tailored to meet specific needs and budgets. These systems will provide long-term protection and are designed to withstand the UK’s challenging weather conditions.

Independently tested against rigorous industry standards, including acheiving the highest corrosion resistant rating in Europe, Allbase's range of cut-edge corrosion roofing systems has been specifically designed for gutter and roof environments.

Conclusion

Cut edge corrosion is a serious issue that can lead to major issues if left unaddressed. However, with regular maintenance, professional inspections, and the right repair systems, it is possible to manage and prevent this issue effectively.

Allbase’s range of advanced systems for cut edge corrosion, combined with decades of expertise and state-of-the-art drone surveys, ensures your roof remains in optimal condition. Contact Allbase today to discuss how their tailored solutions can protect your commercial or industrial property for years to come.