IBC vs. CBC – Exterior Wall Fire-Protection Difference

Consider a three-story, fully fire-sprinklered, 1-hour fire-rated, wood-framed Type V Group R-1 hotel building constructed under either the International Building Code (IBC) or the California Building Code (CBC) – which is modeled on the IBC.  Assume that the exterior wall assemblies are comprised of the following layers:

• Gypsum board (drywall) panels at interior
• Oriented strandboard (OSB) sheathing panels at interior
• 2” x 6” wood stud framing and associated batt insulation
• OSB sheathing panels at exterior
• Polyolefin weather-resistive ‘building wrap’
• Fiber cement exterior cladding panels

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