Light steel thin-walled structures (LSTS), in particular with thermoprofiles, are widely used in construction of buildings and structures of various applications. These structures possess high heat-saving parameters, at the same time, durability of these structures may be limited by low corrosion resistance of steel. According to the latest amendments in the documentary standards, zinc coated thermoprofiles without additional paint coating may be used as load-bearing structures only in non-aggressive conditions. In this investigation we have established that the use of zinc coated steel with additional paint coating is much more effective measure of protection of steel articles against corrosion than separate zinc and paint coating. As a result of methods for corrosion testing, it was established, that the most effective measure of protection of steel articles against corrosion in aggressive conditions is the use of zinc coated steel with additional paint coating. These samples have been just slightly corroded during the test period (230 days).