View Single Post
  #21240  
Old Posted Mar 11, 2012, 2:55 PM
alan88 alan88 is offline
Registered User
 
Join Date: Feb 2012
Posts: 134
[QUOTE=NewYorkDominates;5622916]
Quote:
Originally Posted by sw5710 View Post

Why do the beams at the 92nd floor look like they have a different color?
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