IBC Design 721.1(2) 6-2.3
1-Hour Fire Rated Solid gypsum plaster — Studless partition with 3/8" rib metal lath installed vertically…
IBC Table 721.1(2), Item 6-2.3 (Solid gypsum plaster): Studless partition with 3/8" rib metal lath installed vertically adjacent edges tied 6" on center with No. 18 gage wire ties, gypsum plaster each side mixed 1:2 by weight, gypsum to sand aggregate. Minimum finished thickness (face-to-face) — 1-hr: 2 (d)". Prescriptive assembly from the adopted building code — thicknesses are code minimums, see table footnotes for conditions.
Studless partition with 3/8" rib metal lath installed vertically adjacent edges tied 6" on center with No. 18 gage wire ties, gypsum plaster each side mixed 1:2 by weight, gypsum to sand aggregate.
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