Fire Sprinkler Protection: fire_resistance
Fire sprinkler K-factors, coverage areas, fire resistance assembly ratings, and clean/suppression agent properties — per NFPA 13, NFPA 2001, NFPA 12, UL Fire Resistance Directory, ACI 216.1
| record type | record id | UL design number example | assembly description | assembly type | min thickness in (in) | notes | rating hours (hr) | subcategory |
|---|---|---|---|---|---|---|---|---|
| fire_resistance | concrete_slab_1hr | ACI 216.1 Table 4.4.2 | One-hour fire-rated concrete slab: Normal-weight concrete (NWC) slab 3.5 in thick minimum; or lightweight concrete (LWC) 3.2 in thick minimum. Tested per ASTM E119. Restrained and unrestrained assembly. | concrete_slab_1hr | 3.5 | Cover to bottom reinforcement min 0.75 in; NWC density 145 pcf; calcareous aggregate | 1 | fire_resistance |
| fire_resistance | concrete_slab_2hr | ACI 216.1 Table 4.4.2 | Two-hour fire-rated concrete slab: NWC slab 4.5 in thick minimum; or LWC 4.0 in thick minimum. Tested per ASTM E119 unrestrained. | concrete_slab_2hr | 4.5 | Reinforcing cover increased for 2-hr; typical residential floor slab or parking deck | 2 | fire_resistance |
| fire_resistance | gypsum_wall_1hr | UL Design U305 | One-hour fire-rated partition: 2x4 wood studs @ 16 in OC, one layer 5/8 in Type X gypsum board each side. Min stud size 2x4 nominal, no cavity insulation required. Tested per ASTM E119 / UL 263. | gypsum_wall_1hr | 1.25 | Based on ASTM E119 testing; 5/8 in Type X gypsum is critical; framing protected by gypsum layer | 1 | fire_resistance |
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