Type II Construction


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    Brandon Estes (Edited )

    Type II construction is simply of non-combustible materials, similar to Type I but a wee bit less stringent regarding fire-resistance ratings.  Types I and II are often lumped together (generally) because they are both of "non-combustible" materials.  Type III is the non-combustible walls but with combustible roof/interior materials.  

    The construction types table is based on levels of combustion/fire ratings and the "combustability" (maybe not a word) increases with each type, Type I and II being the least combustible, Type III using some combustible materials, Type IV being heavy timber which the structure is reasonably safe in a fire but is still combustible, and Type V being your standard stick-built that you see most in residential construction (and some small commercial).  

    So when you see Construction Type __, think about fire-resistant materials (concrete, steel), fire ratings, and whether they are "protected" or not, which is A, and unprotected is B.  Also, the IBC does not provide a definition of "protected," so don't rack your brain looking for one.  Fore example, A or B (protected or not) is the difference between a steel column being encased in gyp board or that spray-on stuff versus an exposed steel column, but "protected" is not a defined term in the code.

    I don't think masonry would be described as Type II, but I suppose it is possible if you supported the roof with a steel truss system that transferred the roof load to the masonry wall.  But this is NCRAB - they might classify a building made of cotton candy, licorice sticks, and wet hair as Type I construction and insist that gnomes are what causes elevators go up and down.  Good luck!

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