unprotected building elements

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Yong Jae Kim

December 28, 2018 04:52

Hello,

According to IBC, Type II-B construction allows unprotected noncombustible building elements. What does "unprotected" mean here? If fireproofing spray is applied to a beam, does that mean the beam is protected? Can you give me some examples of the projection method?

 

Thank you!

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  Osman Bilger December 28, 2018 12:03

  Protected means fireproofed. Could be sprayed, concrete encapsulation, gypsum, and so on. Building codes illustrated has good info on this. Certain building elements such as lateral bracing doesnt need a fire rating.

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  David Kaplan December 28, 2018 13:33

  Yes, "unprotected" means that there is no fire rated assembly that provides any rating to that structural element.  You look around a IIB building, you see fully exposed steel columns and floor structure above - no fireproof spray, no fire-rated gypsum board assemblies wrapping the columns.  In the event of a fire, that structure is "unprotected." 

  When you said "projection method" did you mean to say "protection method?"  If so, protection would be achieved by either fireproof spray or like I mention above, encapsulating the structure in some fire-rated, UL-tested wall assembly. 

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  Yong Jae Kim December 28, 2018 20:25

  Thank you! that's very clear. I really appreciate it.

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