[QUOTE=NewYorkDominates;5622916]
Quote:
Originally Posted by sw5710
Why do the beams at the 92nd floor look like they have a different color?
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This steel is now at a mechanical room plenum and exposed to atmosphere as air intakes and exhausts, so it gets a different type of fire proofing, cementitious. This steel has been painted with a special epoxy that prevents corrosion but also allows for the fireproofing to adhere to it, and pass the pull tests.
Alan