Structural scaffolding made from steel has a number of advantages. Steel is very strong and durable, with elasticity in a variety of conditions. It is not so elastic that it will bend and fail, but it's also not rigid, which could expose it to the risks of cracks and other flaws. Steel scaffolding is capable of supporting very high weights, allowing people to use it with heavy equipment and supplies. After a certain height, steel scaffolding becomes necessary because of the sheer weight of the scaffolding itself, even before anything is loaded on.
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