Table 601 indicates a 3 hour fire-resistance rating requirement for building type I.
However, as per 602.2, Types I and II construction shall be noncombustible.
I don't understand how the 3,2,1 hr fire ratings listed in the table 601 tie into this notion of non-combustibility.
If types I and II are required to be non-combustible, shouldn't the fire-resistance rating indicated in table 601 be the same for the two construction types (i.e. the fire resistance rating would be "non-combustible")
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