Increased Exposure Allowances for IV-B Construction
What a difference a few years can make. The 2021 IBC guidelines for buildings of Type IV construction divided the classification into three categories: IV-A (buildings up to 18 stories), IV-B (12 stories), and IV-C (nine stories). In IV-B buildings, the amount of exposed timber ceilings permitted was only 20%.However, in 2024, IV-B was updated…
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