Cut Edge Corrosion

Stop Edge Failure Before It Spreads

Corrosion along the cut edges of metal roof sheets is a familiar problem for industrial and commercial properties, particularly where age or movement has caused coating breakdown. By addressing this early with purpose-made systems, contractors can seal joints, cover exposed edges, and prevent water ingress. Most treatments include primers, flexible jointing compounds, and UV-resistant finishes, forming a durable barrier that slows further deterioration and restores surface integrity.

Because these issues rarely occur in isolation, they’re often tackled alongside related cladding damage and covered using colour-matched metal paints that blend with the existing roof. Designed to handle high exposure and sheet movement, these systems are suitable for maintenance teams and roofing contractors working on warehouses, factories, and retail units. With proper preparation and application, they offer performance of up to 20 years and help reduce the need for re-sheeting. For larger sites, tailored specifications and site survey support are available.

Cut Edge Corrosion FAQs

Can I use a cut edge corrosion system during winter months?

Yes, provided temperatures meet the product's minimum application range. Some systems include fast-curing or moisture-tolerant properties suitable for colder months. Surfaces must be clean, dry, and frost-free before application. Avoid applying during heavy rain or extreme cold unless the system is specifically designed for such conditions. Always refer to the technical data sheet for seasonal application guidance or speak with a technical advisor before starting winter work.

Do I need to remove all rust before applying a treatment?

Yes, rust must be removed to a sound surface before applying the treatment. This can involve wire brushing, sanding, or using rust converters depending on the severity. Most systems require a stable, clean surface for adhesion, and failing to prepare correctly will result in premature coating failure. Some products tolerate minor embedded rust, but this should always be confirmed in the technical data sheet.

What kind of primer should I use before sealing overlaps?

Primer selection depends on the condition of the metal and the environment. Zinc-rich primers are used for galvanised steel, while epoxy or acrylic primers may suit weathered or rust-prone surfaces. Systems typically specify a compatible primer within their product range. Using a non-compatible primer risks undermining adhesion and longevity. Always follow the manufacturer’s guidance to ensure performance.

Is reinforcement tape always necessary for cut edge corrosion repairs?

Reinforcement tape is recommended when treating end laps or areas where movement or joint separation is expected. It strengthens the system and helps the sealant cope with expansion, contraction, and vibration. While some products claim to function without tape, using it ensures longer-lasting results, particularly on high-risk areas. Refer to the system specification to determine if reinforcement is essential for your project.