According to IBC, what is the maximum height allowed for Type IIIB construction for a business occupancy?
Correct Answer
D) 40 feet
Per IBC Table 504.3, Type IIIB construction is limited to 40 feet in height for business occupancy (Group B).
Why This Is the Correct Answer
According to IBC Table 504.3, Type IIIB construction (ordinary construction, unprotected) is specifically limited to a maximum height of 40 feet for Group B (business) occupancies. This height restriction is established to maintain fire safety standards for this construction type, which has limited fire resistance ratings and requires height limitations to ensure adequate egress time and fire department access.
Why the Other Options Are Wrong
Option A: 50 feet
85 feet is far beyond the height allowance for Type IIIB construction. This height would typically require construction types with superior fire resistance characteristics, such as Type I or Type II construction, not the ordinary unprotected construction of Type IIIB.
Option B: 85 feet
65 feet significantly exceeds the allowable height for Type IIIB construction. This height limitation might apply to other construction types with better fire resistance ratings, but Type IIIB ordinary unprotected construction is restricted to much lower heights for safety reasons.
Option C: 65 feet
50 feet exceeds the IBC height limitation for Type IIIB construction in business occupancies. This height might be confused with other construction types or occupancy groups, but Type IIIB specifically has a 40-foot maximum height restriction per Table 504.3.
Memory Technique
Remember 'Type IIIB Business = 40' - Type III-B for Business occupancy maxes out at 40 feet, like a typical 3-4 story office building.
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