Chapter 25 — GYPSUM PANEL PRODUCTS AND PLASTER
2506 Gypsum Panel Product Materials — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-09-25 · 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) § 2506 · Effective January 1, 2026 · Official source: Building Standards Commission
2506.1 General.¶
Gypsum panel products and accessories shall be identified by the manufacturer’s designation to indicate compliance with the appropriate standards referenced in this section and stored to protect such materials from the weather.
2506.2 Standards.¶
Gypsum panel products shall conform to the appropriate standards listed in Table 2506.2 and Chapter 35 and, where required for fire protection, shall conform to the provisions of Chapter 7.
TABLE 2506.2—GYPSUM PANEL PRODUCTS MATERIALS AND ACCESSORIES
| MATERIAL | STANDARD |
|---|---|
| Accessories for gypsum board | ASTM C1047 |
| Adhesives for fastening gypsum board to wood framing | ASTM C557 |
| Cold-formed steel studs and track, structural | AISI S240 |
| Cold-formed steel studs and track, nonstructural | AISI S220 |
| Elastomeric joint sealants | ASTM C920 |
| Expandable foam adhesives for fastening gypsum wallboard to wood framing | ASTM D6464 |
25-4 2025 CALIFORNIA BUILDING CODE
GYPSUM PANEL PRODUCTS AND PLASTER
TABLE 2506.2—GYPSUM PANEL PRODUCTS MATERIALS AND ACCESSORIES—continued
| MATERIAL | STANDARD |
|---|---|
| Factory-laminated gypsum panel product | ASTM C1766 |
| Fiber-reinforced gypsum panels | ASTM C1278 |
| Glass mat gypsum backing panel | ASTM C1178 |
| Glass mat gypsum panels | ASTM C1658 |
| Glass mat gypsum substrate used as sheathing | ASTM C1177 |
| Joint reinforcing tape and compound | ASTM C474; C475 |
| Nails for gypsum boards | ASTM C514, F547, F1667 |
| Steel screws | ASTM C954; C1002 |
| Standard specification for gypsum board | ASTM C1396 |
| Testing gypsum and gypsum products | ASTM C22; C472; C473 |
2506.2.1 Other materials. Metal suspension systems for acoustical and lay-in panel ceilings shall comply with ASTM C635 listed in Chapter 35 and Section 13.5.6 of ASCE 7 for installation in high seismic areas.
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