Section 719 — FIRE-RESISTANCE REQUIREMENTS FOR PLASTER — 2025 California Building Code (Title 24, Part 2)

719.1 Thickness of plaster. ¶

719.1 Thickness of plaster. The minimum thickness of gypsum plaster or Portland cement plaster used in a fire-resistance-rated system shall be determined by the prescribed fire tests. The plaster thickness shall be measured from the face of the lath where applied to gypsum lath or metal lath.

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719.2 Plaster equivalents. ¶

719.2 Plaster equivalents. For fire-resistance purposes, [1] / 2 inch (12.7 mm) of unsanded gypsum plaster shall be deemed equivalent to [3] / 4 inch (19.1 mm) of one-to-three gypsum sand plaster or 1 inch (25 mm) of Portland cement sand plaster.

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719.3 Noncombustible furring. ¶

719.3 Noncombustible furring. In buildings of Types I and II construction, plaster shall be applied directly on concrete or masonry or on approved noncombustible plastering base and furring.

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719.4 Double reinforcement. ¶

719.4 Double reinforcement. Plaster protection more than 1 inch (25 mm) in thickness shall be reinforced with an additional layer of approved lath embedded not less than [3] / 4 inch (19.1 mm) from the outer surface and fixed securely in place. Exception: Solid plaster partitions or where otherwise determined by fire tests.

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719.5 Plaster alternatives for concrete. ¶

719.5 Plaster alternatives for concrete. In reinforced concrete construction, gypsum plaster or Portland cement plaster is permitted to be substituted for [1] / 2 inch (12.7 mm) of the required poured concrete protection, except that a minimum thickness of [3] / 8 inch (9.5 mm) of poured concrete shall be provided in reinforced concrete floors and 1 inch (25 mm) in reinforced concrete columns in addition to the plaster finish. The concrete base shall be prepared in accordance with Section 2510.7.

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