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Chapter 25: Gypsum Board, Gypsum Panel Products and Plaster
Section BC 2501: General
Section BC 2502: Definitions
Section BC 2503: Reserved
Section BC 2504: Vertical and Horizontal Assemblies
Section BC 2505: Shear Wall Construction
Section BC 2506: Gypsum Board and Gypsum Panel Product Materials
Section BC 2507: Lathing and Plastering
Section BC 2508: Gypsum Construction
2508.1 General.
2508.2 Limitations.
2508.2.1 Weather protection.
2508.3 Single-ply application.
2508.3.1 Floating angles.
2508.4 Joint treatment.
2508.5 Horizontal gypsum board or gypsum panel product diaphragm ceilings.
2508.5.1 Diaphragm proportions.
2508.5.2 Installation.
2508.5.3 Blocking of perimeter edges.
2508.5.4 Fasteners.
2508.5.5 Lateral force restrictions.
Section BC 2509: Showers and Water Closets
Section BC 2510: Lathing and Furring for Cement Plaster (Stucco)
Section BC 2511: Interior Plaster
Section BC 2512: Exterior Plaster
Section BC 2513: Exposed Aggregate Plaster
Section BC 2514: Reinforced Gypsum Concrete
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2508.1 General.
Gypsum board, gypsum panel products and gypsum plaster construction shall be of the materials listed in Tables 2506.2 and 2507.2. These materials shall be assembled and installed in compliance with the appropriate standards listed in Tables 2508.1 and 2511.1.1, and Chapter 35.
Table 2508.1
Installation of Gypsum Construction
Material
Standard 
Material
Standard 
Gypsum board and gypsum panel products
GA-216; ASTM C 840
Gypsum sheathing and gypsum panel products
ASTM C 1280
Gypsum board (Interior)
ASTM C 1396
Gypsum board (Exterior)
ASTM C 1396
Gypsum veneer base
ASTM C 844
Interior bathing and furring
ASTM C 841
Steel framing for gypsum board and gypsum panel products
ASTM C 754; C 1007
 
2508.2 Limitations.
Gypsum wallboard or gypsum plaster shall not be used in any exterior surface where such gypsum construction will be exposed directly to the weather. Gypsum wallboard shall not be used where there will be direct exposure to water or continuous high humidity conditions beyond the published recommendations of the manufacturer. Gypsum sheathing shall be installed on exterior surfaces in accordance with ASTM C 1280.
2508.2.1 Weather protection.
Gypsum wallboard, gypsum lath or gypsum plaster shall not be installed until weather protection for the installation is provided.

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