Many coastal areas are subject to hurricanes, which can bring sustained winds from 74 mph to 157+ mph. (Photo courtesy of S-5!)Īfter the metal type and coating are determined for the specific job, you must consider how to keep the roof on the building. S-5!® WindClamps are designed to increase wind resistance. Flurothane® Coastal coatings can be applied to a variety of substrates, including Hot-Dip Galvanized (HDG), Galvalume®, and aluminum. The system has been field-proven and provides a high-performance finish, as well as the following unique benefits: outstanding resistance to UV rays, exceptional color retention, and resistance to chalking from salt spray and harsh coastal environments. Sherwin-Williams Coil Coatings offers Flurothane® Coastal, “a two-coat system that uses an innovative thick-film primer to thrive in the most severe coastal environments.” This premium fluoropolymer 70% PVDF system was created to deliver long-lasting protection for industrial, commercial, or architectural projects within 1,500′ of the coastline. Many coil coating companies make systems specifically designed to resist the issues commonly plaguing coastal roofs. A two-coat coil-applied PVDF system will help resist the harsh coastal environment.” Another option is stone-coated steel, which can provide prolonged resistance. A Polyvinylidene Difluoride (PVDF) coating is recommended to help keep the substrate metal free from oxidation. Bare metal is much more prone to oxidation, nothing stopping the salt spray from interacting with it. According to Lord, “It is important to utilize a coated metal when on the coast. Once a metal type is chosen, next up on the list of considerations is the coating/finish. Has a higher resistance to corrosion than galvanized. Zinc-Alum Coated Steel (commonly known as Galvalume®): Strong. Stainless Steel: Strong has some corrosion to fasteners of carbon steel. Patina darkens the coloring and the cost is high.Īnderson also added that alloys can bring added benefits: Warranty and performance to winds may be lower. Zinc: Though highly corrosion-resistant, does not have the strength of steel. Patina of aluminum oxide will dull the bare color. Warranty and performance to winds may be lower than other materials. Has a high cost and is heavier than other metals.Īluminum: Though highly corrosion-resistant, also does not have the strength of steel. Warranties and wind performance may be lower than other materials. Natural metals are often said to perform best, as shared by Robin Anderson, Technical Manager for Boral Roofing, who noted about each:Ĭopper: Though highly corrosion-resistant, copper does not have the strength of steel. The entire roof system will be less of a load on the structure, but won’t stand up to the punishment of a severe hailstorm as well as steel. Aluminum is more cost-effective than stainless steel and zinc and still does a superb job at handling salt-spray environments.” He recommends avoiding galvanized steel as it can rapidly corrode in this environment.ĭrexel Metals’ Director of Sales, Ken McLauchlan, added that while aluminum is more corrosion-resistant than steel (and is lighter), it is also softer. Stainless steel and zinc are also great options, but tend to be more expensive. Travis Lord, Product Manager for The Garland Company, said, “When on the coast, typically the go-to will be. Here are areas to consider when bidding a metal roofing job by the sea. roofing market requires solutions that can stand up to this often-harsh environment. With 22 states boasting saltwater coastline, the U.S. The NOAA also states that annually, coastal counties produce more than $8.6 trillion in goods and services-the businesses producing this money are housed in commercial, industrial, agricultural, or residential buildings, which also need roofs. Faced with salt spray exposure and hurricane-force wind and rain, more and more seaside homeowners are choosing metal roofing due to its hardiness, longevity, and proven track record along the coast. That’s a lot of people, who require a lot of residential structures, which need a lot of roofs. coastal counties according to a report by the National Oceanic and Atmospheric Administration’s (NOAA) Office for Coastal Management. In 2010, 123.3 million people lived in U.S. 2.4K Considerations and concerns for coastal installations
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