Corrugated Metal Roofing
The corrugated metal roof has been used for centuries to provide safety and security to homes and businesses. Modern engineering has transformed this time-honored tradition and brought it into the twenty-first century with new materials and manufacturing innovations. While old corrugated metal roofs can seem rustic or unattractive, their modern counterparts gleam with functional strength and aesthetic beauty. There are many different kinds of material that can be used for this classic and functional style.
What Distinguishes Corrugated Metal Roofing
A corrugated metal roof is most easily distinguished by the way that the material looks and the way that it is made. Traditionally, the material is cold rolled after casting to form periodic folds in the metal. This isn’t done for looks – the cold rolling strengthens the material significantly, enhancing its physical endurance and mechanical durability. The material is only strengthened in the direction which is parallel to the corrugations. Corrugated metal roofs have been in use since 1840 when this process was first developed.
Corrugated Metal Roofing Materials
While the first corrugated metal roofs used wrought iron, those that are installed today use one of a variety of materials. Some have been highly engineered to provide enhanced mechanical properties or a better aesthetic. Others are more simple, having the benefit of lower costs. One of the most common materials seen is galvanized steel. Galvanized corrugated metal roofing is typically rolled steel which has been cold-pressed to provide mechanical strengthening. Before it’s been pressed, the metal is coated with zinc in order to stop the sheets from rusting. The downside to galvanized steel is that the finish will oxidize, changing the external color and appearance over time. While this coating acts as a passivation layer to keep the rest of the material safe, it may not be the most attractive choice. Stainless steel is another excellent choice, especially if you don’t expect the roofing to endure especially harsh conditions. While it may not be as strong as other steel alloys, stainless steel roofing is famous for its excellent natural corrosion resistance. This means that it retains its initial look for far longer than almost any other metal roofing material
Engineered Corrugated Metal Roofing Materials
There are certain engineered corrugated metal roofing materials that provide superior corrosion resistance, mechanical performance, and aesthetic look. While these may be more expensive, they can ultimately be worth the cost if you have the need. If you like the advantages of galvanized steel but desire something with greater corrosion resistance, you may want to look into Galvalume(R). This material uses a modified coating to provide better resistance to rusting and the elements. Instead of pure zinc, an alloy of 55% aluminum and 45% zinc with trace amounts of silicon is used. The silicon is added to ensure that the coating forms a sturdy bond to the underlying steel. By providing better corrosion resistance, there is less of a chance of the stress points on the roof weakening due to interactions with the environment. This ensures a longer lifespan for the roof. While previous materials tend to have metallic looks to them, it is possible to have a corrugated metal roof that does not exhibit this kind of finish. Manufacturers offer Kynar painted corrugated metal roofing for those that enjoy the benefits of this style of roofing but want something that’s a bit flashier. Kynar is one of the primary components of high-quality paint. It is famous for its excellent gloss, its color retention over time, and its resistance against corrosive elements. Using a Kynar finish on corrugated metal roofing ensures bright and bold colors that will last for decades, which is why it has been used on many prominent new buildings such as the Petronas Towers in Malaysia.
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