Mixed Occupancy Fire Separation Calculator

Determine required fire separation ratings between different occupancy groups per IBC Table 508.4.

Input Parameters

Results

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Required Separation
hours
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Separation Type
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Sprinkler Reduction
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IBC Reference
Note: The IBC provides two methods for mixed occupancies: accessory use areas (Section 508.2), nonseparated uses (Section 508.3), and separated uses (Section 508.4). This calculator uses the separated use method. Sprinkler reductions shown are for buildings with NFPA 13 systems throughout.

Reference

IBC Table 508.4 - Required Separation of Occupancies (hours) Separated occupancies method per IBC Section 508.4 Sprinkler reductions per IBC Section 508.4 footnotes H occupancies generally require highest separations (3-4 hours) Common combinations: A/B = 2hr (1hr sprinklered) Same occupancy = no separation required