TablesC-4 Structural design for fire conditions
Qualification Standards
PDF page 688 · AISC 360-22
| Assembly | Item Number | Fire Protection Material Used | Minimum Thickness of Insulating Material for Fire-Resistance Times, in. (mm) | |||
|---|---|---|---|---|---|---|
| 4 hrs | 3 hrs | 2 hrs | 1 hr | |||
| 1. Steel columns and all of primary trusses | 1-3.1 | 4 in. (100 mm) hollow clay tile in two 2 in. (50 mm) layers; 1/2 in. (13 mm) mortar between tile and column; 3/8 in. (10 mm) metal mesh 0.046 in. (1.2 mm) wire diameter in horizontal joints; tile fill[b] | 4 (100) | – | – | – |
| 1-3.2 | 2 in. (50 mm) hollow clay tile; 3/4 in. (19 mm) mortar between tile and column; 3/8 in. (10 mm) metal mesh 0.046 in. (1.2 mm) wire diameter in horizontal joints; limestone concrete fill[b]; plastered with 3/4 in. (19 mm) gypsum plaster. | 3 (75) | – | – | – | |
| 1-3.3 | 2 in. (50 mm) hollow clay tile with outside wire ties 0.08 in. (2.0 mm) diameter at each course of tile or 3/8 in. (10 mm) metal mesh 0.046 in. (1.2 mm) diameter wire in horizontal joints; limestone or trap-rock concrete fill[b] extending 1 in. (25 mm) outside column on all sides. | – | – | 3 (75) | – | |
| 1-3.4 | 2 in. (50 mm) hollow clay tile with outside wire ties 0.08 in. (2 mm) diameter at each course of tile with or without concrete fill; 3/4 in. (19 mm) mortar between tile and column. | – | – | – | 2 (50) | |
| 1-8.1 | Wood-fibered gypsum plaster mixed 1:1 by weight, gypsum-to-sand aggregate applied over metal lath. Lath lapped 1 in. (25 mm) and tied 6 in. (150 mm) on center at all ends, edges, and spacers with 0.049 in. (1.2 mm) (No. 18 B.W. gage) steel tie wires. Lath applied over 1/2 in. (13 mm) spacers made of 3/4 in. (19 mm) furring channel with 2 in. (50 mm) legs bent around each corner. Spacers located 1 in. (25 mm) from top and bottom of member and a maximum of 40 in. (1 000 mm) on center and wire tied with a single strand of 0.049 in. (1.2 mm) (No. 18 B.W. gage) steel tie wires. Corner bead tied to the lath at 6 in. (150 mm) on center along each corner to provide plaster thickness. | – | – | 15/8 (41) | – | |