Quote:
Originally Posted by viewguysf
I think the lighter weight steel is for screening to hide the mechanical penthouse and finish off the top of the tower. We saw the same thing on 555 Mission, NEMA (not well done), and many other buildings, especially Salesforce Tower. You can see structural steel for a mechanical penthouse behind the lightweight steel.
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Looks like a galvanized coating; possibly all that steel will be exposed to the elements as part of an elaborate rooftop screen.
Sometimes you will also see red steel - this is steel that has been coated in a red primer and will be painted for an exposed look (in a skyscraper this usually requires intumescent coating for fireproofing which is very expensive).
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