IBC Design 721.1(2) 6-2.1
1-Hour Fire Rated Solid gypsum plaster — Studless with 1/2" full-length plain gypsum lath and gypsum plaster…
IBC Table 721.1(2), Item 6-2.1 (Solid gypsum plaster): Studless with 1/2" full-length plain gypsum lath and gypsum plaster each side. Plaster mixed 1:1 for scratch coat and 1:2 for brown coat, 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 with 1/2" full-length plain gypsum lath and gypsum plaster each side. Plaster mixed 1:1 for scratch coat and 1:2 for brown coat, by weight, gypsum to sand aggregate.
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