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Although cut edge corrosion is one of the most frequent problems for roofs using metal cladding systems over their service life. It is not always easy to detect when cut edge corrosion starts to develop. This is a problem as failing to identify the development of cut edge carrion at an early stage, can lead to serious damage to the roofing system. This of course will lead to expensive roof repair costs. In this article, we will help you understand the early warning signs of cut edge corrosion. And help you understand how to treat this corrosion in its early stages to prevent the need for expensive repairs or even the need to have a full roof replacement.
Rust is the most obvious sign of cut edge corrosion beginning to develop. The place where rust will first become an issue is on the cut edge of the metal cladding. This will be where the protective coating has broken down and now left the metal cladding panel expose to the elements. Rust (1) may appear as spots or streaks on the surface of the metal roof cladding. The colouring of these spots or streaks will be reddish-brown in colour. When first developing, the rust may be hard to spot due to the size of these spots or streaks being small. But, when spotted they must be dealt with as this will only get worst. Left to deteriorate further will result in the rust eating away at the metal. And over time this will lead to holes in the roof. At best this will result in a new roof panel being need and in worst case an expensive full roof replacement.
When the protective coating which covers the metal roof panels begins to peel back, you have an early sign of cut edge corrosion developing. As mentioned in the previous paragraph, rust develops once the protective coating has begun to leave the metal cladding below exposed. If you can identify protective coating which has begun to peel back and fix the problem before rust develops, you will have gone a long way to maximising the service life or your roof. As we will cover later the only real way to identify the initial stages of the protective coating peeling back is with regular roof surveys.
Cracks and splits in the protective coating of the metal roof can also indicate a high risk of corrosion developing. The most likely reason for this to develop is due to thermal movement. This is where fluctuations in temperature cause the metal panels on the roof to expand and contract. This places stress on the protective coating which covers them. And can eventually lead to cracks of splits. Once a crack or split develops there is an opportunity for the elements to penetrate and the result is the metal below being exposed. Over time there is a good probability corrosion will develop.
Other warning signs of cut edge corrosion developing include any damp smells or water staining on the inside of the building. If you notice any decline in the appearance of your metal roof this is also a sign cut edge corrosion could be present or developing. If any other these signs are present, you would be best served by booking a roof survey.
Like with any roof, the first step is to make sure you start off with a correctly installed roofing system. Make sure whoever installs your roof is a reputable roofing contractor who has expertise in installing metal systems. Using quality materials and a quality contractor, will give you the maximum chance of delaying any cut edge corrosion issues as far into the service life of the roof as possible.
Once your roof is installed, the next most important steps to avoiding issues with cut edge corrosion is to schedule regular roof inspections. If any maintenance works are identified as to being required in these inspections they should be conducted promptly. Over the service life of a roof, regular inspections and maintenance will cost you far less than large scale replacements or a roof which needs replacing before its expected lifespan.
If cut edge corrosion is detected it is remedied by applying a protective coating over the areas which was suffering from corrosion. This is done by cleaning the affected areas down so it is free of debris, dirt and rust. A rust converted can be applied to the area. Then a primer if necessary. With the best protective coating to be a Pu liquid. The reason for this is the elastic nature of a Pu liquid coating will allow for thermal movement and provide protection to the metal cladding for the longest period.
Once cut edge corrosion has been treated, regular inspections and the necessary maintenance should still be performed to ensure the roof has the maximum possible lifespan.
Overall, the important thing to recognise when dealing with cut edge corrosion is to understand it will develop into a serious problem if left untreated. Once the early signs are detected the best course of action is to act immediately. Any money you invest in regular commercial roof surveys and maintenance will save you from costly repairs and having to pay for a new roof before the expected lifespan of the roof.
If you would like some expert help on identifying or treating the early signs of cut edge corrosion. Please do not hesitate to get in touch with our team of roofing experts. You can do this through our contact form or call us on 01277 375 511. One of our friendly expert team will be delighted to help you find the best solution to your cut edge corrosion issue.
