Fire Resistance Ratings: wall_cmu
Fire resistance ratings for building assemblies per UL/ASTM E119 — IBC Table 601 construction-type requirements (Types IA through VB), CMU wall equivalent-thickness ratings by aggregate type, gypsum board on steel/wood stud assemblies, concrete slab and wall thicknesses, composite steel deck/concrete floors, spray-applied fireproofing (SFRM) for columns and beams by W/D ratio, concrete-encased column ratings, and fire door assembly ratings (20-minute through 3-hour). Sources: IBC 2021 Table 601, ACI 216.1-14, UL Fire Resistance Directory, GA-600-2021, NFPA 80-2022, ASTM E119.
| assembly category | record id | assembly description | assembly type | construction material | fire rating hr (hr) | key materials | min thickness in (in) | notes |
|---|---|---|---|---|---|---|---|---|
| wall_cmu | cmu_carbonate_1hr | CMU Wall — Carbonate Aggregate — 1 Hour | wall | concrete_masonry_unit | 1 | CMU_carbonate_aggregate, siliceous_aggregate_gives_higher_thicknesses | 3.2 | Equivalent thickness = solid thickness in hollow unit; per IBC Table 722.5.1.2 and ACI 216.1; CMU aggregate type governs thickness requirement |
| wall_cmu | cmu_carbonate_2hr | CMU Wall — Carbonate Aggregate — 2 Hour | wall | concrete_masonry_unit | 2 | CMU_carbonate_aggregate | 4.6 | Carbonate: limestone or dolomite coarse aggregate |
| wall_cmu | cmu_carbonate_3hr | CMU Wall — Carbonate Aggregate — 3 Hour | wall | concrete_masonry_unit | 3 | CMU_carbonate_aggregate | 6.2 | 10-inch CMU typically satisfies 3-hour with carbonate aggregate |
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