Chapter 25 — GYPSUM PANEL PRODUCTS AND PLASTER
2514 Reinforced Gypsum Concrete — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Building Code (Title 24, Part 2) § 2514 · Effective January 1, 2026 · Official source: Building Standards Commission
2514.1 General.¶
Reinforced gypsum concrete shall comply with the requirements of ASTM C317 and ASTM C956.
Exception: [DSA-SS and OSHPD 1, 1R, 2, 4 & 5] Reinforced gypsum concrete shall be considered as an alternative system, except for
[OSHPD 2] single-story Type V skilled nursing or intermediate care facilities utilizing wood-frame or light-steel-frame construction.
2514.2 Minimum thickness.¶
The minimum thickness of reinforced gypsum concrete shall be 2 inches (51 mm) except the minimum required thickness shall be reduced to 1 1/2 inches (38 mm), provided that the following conditions are satisfied:
- The overall thickness, including the formboard, is not less than 2 inches (51 mm).
- The clear span of the gypsum concrete between supports does not exceed 33 inches (838 mm).
- Diaphragm action is not required.
- The design live load does not exceed 40 pounds per square foot (psf) (1915 Pa).
CHAPTER 26 – PLASTIC
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
| Adopting agency | BSC | BSC-CG | SFM | HCD 1 | HCD 2 | HCD 1/AC | DSA AC | DSA SS | DSA SS/CC | OSHPD 1 | OSHPD 1R | OSHPD 2 | OSHPD 3 | OSHPD 4 | OSHPD 5 | OSHPD 6 | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adopt entire chapter | X | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||
| Adopt entire chapter as amended (amended sections listed below) | ||||||||||||||||||||||||
| Adopt only those sections that are listed below | ||||||||||||||||||||||||
| Chapter / Section |
The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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