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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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2507.1 General.
Lathing and plastering materials and accessories shall be marked by the manufacturer's designation to indicate compliance with the appropriate standards referenced in this section and stored in such a manner to protect them from the weather.
2507.2 Standards.
Lathing and plastering materials shall conform to the standards listed in Table 2507.2 and Chapter 35 and, where required for fire protection, shall also conform to the provisions of Chapter 7.
Table 2507.2
Lath, Plastering Materials and Accessories
Material
Standard 
Material
Standard 
Accessories for gypsum veneer base
ASTM C 1047
Blended cement
ASTM C 595
Cold-formed steel studs and track, nonstructural
AISI S220 and ASTM C 645, Section 10
Cold-formed steel studs and track, structural
AISI S200 and ASTM C 955, Section 8
Exterior plaster bonding compounds
ASTM C 932
Gypsum casting and molding plaster
ASTM C 59
Gypsum Keene's cement
ASTM C 61
Gypsum plaster
ASTM C 28
Gypsum veneer plaster
ASTM C 587
Hydraulic cement
ASTM C 1157; C 1600
Interior bonding compounds, gypsum
ASTM C 631
Lime plasters
ASTM C 5; C 206
Masonry cement
ASTM C 91
Metal lath
ASTM C 847
Plaster aggregates
   Sand
   Perlite
   Vermiculite

ASTM C 35; C 897
ASTM C 35
ASTM C 35
Plastic cement
ASTM C 1328
Portland cement
ASTM C 150
Steel screws
ASTM C 1002; C 954
Welded wire lath
ASTM C 933
Woven wire plaster base
ASTM C 1032
 
Section BC 2508: Gypsum Construction
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.

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