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Cut Edge Corrosion – What Is It, and How Can It Be Identified?

HS RoofClad

What is Cut Edge Corrosion?

Triggered by the cut edge of a metal sheet being insufficiently coated during the manufacturing stage, any untreated metal edge exposed to the elements is vulnerable to Cut Edge Corrosion (CEC). The process is accelerated by water being retained within the laps and joints of a roof’s structure, with the potential for oxidisation (rusting) to also occur.

How to Identify Cut Edge Corrosion

Keep an eye out for blisters, cracks and discolouration on your roof, with extra monitoring around the laps and joints of the structure.

Early identification of the problem is key when it comes to CEC, as if left untreated, it can quickly progress further into the metal and cause more than a cosmetic problem for your roof – including leaks and brittle sheets, which can affect the integrity of your building. Lack of identification and treatment can even lead to a complete re-roof in the worst cases. As specialists in the roofing industry, we would recommend including an annual Roof Survey within your Planned Preventive Maintenance (PPM).

Treatment and Repairs for Cut Edge Corrosion

Early treatment will not only save you money in the long run, but it will also prolong the life of your cladding and prevent potentially lengthy disruptions to your business.

The first step in treating CEC is to inspect the damage and determine the level of repairs required. As metal guttering can also be a contributing factor, gutters will need to be assessed, as if poorly fitted they will only further aggravate the corrosion to your roof sheets. Following inspections, the entire area will require a thorough clean to remove both rust and dirt, enabling waterproof sealants to be laid effectively. Further protective layers of sealant should then be applied to allow for increased protection – most waterproofing treatments carry a manufacturer supported warranty of 10 to 25 years.

If Cut Edge Corrosion is left untreated for long periods of time and the damage is extremely severe, preventative measures may not be suitable and removal of the entire metal sheet may be required

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Office

HS RoofClad
6 Caldbeck Road,
Croft Business Park,
Bromborough,
Wirral
CH62 3PL

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Horseshoe Hill,
Upshire,
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EN9 3SR

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