IBC Design 721.1(2) 15-1.4
1-Hour Fire Rated Exterior or interior walls — 3-5/8" No. 16 gage noncombustible studs 16" on center with 7/8"…
IBC Table 721.1(2), Item 15-1.4 (Exterior or interior walls): 3-5/8" No. 16 gage noncombustible studs 16" on center with 7/8" cement plaster (measured from the face of the studs) on the exterior surface with interior surface treatment as required for interior, nonbearing, noncombustible stud partitions in this table. Plaster mix 1:4 for scratch coat and 1:5 for brown coat, by volume, cement to sand. Minimum finished thickness (face-to-face) — 1-hr: Varies (d)". Prescriptive assembly from the adopted building code — thicknesses are code minimums, see table footnotes for conditions.
3-5/8" No. 16 gage noncombustible studs 16" on center with 7/8" cement plaster (measured from the face of the studs) on the exterior surface with interior surface treatment as required for interior, nonbearing, noncombustible stud partitions in this table. Plaster mix 1:4 for scratch coat and 1:5…
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