According to 2009 IBC Chapter 6, Type I thru Type IV construction is divided by the use of non-combustible vs. combustible materials. The addition of A or B defines if the construction is protected or unprotected which is the fire resistance protection applied to structural members and bearing walls; i.e. firerated gypsum board, spray-on fire protection, etc. etc. (not the same as sprinkled or non-sprinkled). Now the question: If type "B" is considered to be "Unprotected", why does Table 601 require fire resistance ratings (applied protections) to "B" categories?
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Construction Types
- Thread starter 1Tarzan1
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B = Unprotected – Unprotected means that all structural members of a building or structure has no additional fire rated
coating or cover. Exposed members are only fire resistant according to their natural ability and characteristics....
steve yarnall
coating or cover. Exposed members are only fire resistant according to their natural ability and characteristics....
steve yarnall
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