IBC Construction Type Classification Calculator

Classify building construction type (I-A through V-B) based on structural element fire-resistance ratings per IBC Table 601.

Input Parameters

Results

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Construction Type
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Sub-Classification
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Combustibility
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IBC Reference
Note: IBC construction types determine allowable height and area per Table 504.3 and 506.2. Type I is the most fire-resistant (noncombustible, highest ratings). Type V is the least restrictive. The classification is based on the fire-resistance ratings of structural elements.

Reference

IBC Table 601 - Fire-Resistance Rating Requirements (hours) Type I-A: Structural=3, Bearing=3, Floor=2, Roof=1.5 Type I-B: Structural=2, Bearing=2, Floor=2, Roof=1 Type II-A: Structural=1, Bearing=1, Floor=1, Roof=1 Type II-B: Structural=0, Bearing=0, Floor=0, Roof=0 (Noncombustible) Type III-A: Ext Bearing=2, Int=1, Floor=1, Roof=1 Type III-B: Ext Bearing=2, others=0 Type IV-HT: Heavy Timber, Structural=2/HT Type V-A: Structural=1, Bearing=1, Floor=1, Roof=1 (Combustible) Type V-B: No requirements (Combustible)