At this point, 95 percent of the steel surface is still covered with zinc but preventive maintenance is necessary to prevent deterioration of the structure. Time to First Maintenance, or TFM, is defined as the appearance of rust on 5 percent of a galvanized steel surface. But the million-dollar question - or depending on the size of your project, maybe the $10 million or $100 million question - is how long does galvanized steel last?ĪSTM International, formerly known as the American Society for Testing and Materials, has a precise answer for this critical question. In the nearly-280 years since a French chemist named Paul Jacques Moulin first described the galvanizing process, fabricators and construction engineers all over the world have gathered a tremendous amount of evidence on the durability of galvanized steel. Hot-dip galvanized steel has been around since 1742.
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