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// CODE SNIPPET

2508.5 Horizontal Gypsum Board Diaphragm Ceilings

Building Code 2012 of South Holland, IL > 25 Gypsum Board and Plaster > 2508 Gypsum Construction > 2508.5 Horizontal Gypsum Board Diaphragm Ceilings
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Gypsum board shall be permitted to be used on wood joists to create a horizontal diaphragm ceiling in accordance with Table 2508.5.
TABLE 2508.5
SHEAR CAPACITY FOR HORIZONTAL WOOD FRAMED GYPSUM BOARD DIAPHRAGM CEILING ASSEMBLIES
MATERIAL THICKNESS OF MATERIAL
(MINIMUM) (inches)
SPACING OF FRAMING
MEMBERS (MAXIMUM)
(inches)
SHEAR VALUEa, b
(plf of ceiling)
MIMIMUM FASTENER SIZE
Gypsum board 1/2 16 o.c. 90 5d cooler or wallboard nail;
15/8-inch long; 0.086-inch shank;
15/64-inch headc
Gypsum board 1/2 24 o.c. 70 5d cooler or wallboard nail;
15/8-inch long; 0.086-inch shank;
15/64-inch headc
For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.59 N/m.
  1. Values are not cumulative with other horizontal diaphragm values and are for short-term loading due to wind or seismic loading. Values shall be reduced 25 percent for normal loading.
  2. Values shall be reduced 50 percent in Seismic Design Categories D, E and F.
  3. 11/4-inch, No. 6 Type S or W screws are permitted to be substituted for the listed nails.

2508.5.1 Diaphragm Proportions

The maximum allowable diaphragm proportions shall be 11/2:1 between shear resisting elements. Rotation or cantilever conditions shall not be permitted.

2508.5.2 Installation

Gypsum board used in a horizontal diaphragm ceiling shall be installed perpendicular to ceiling framing members. End joints of adjacent courses of gypsum board shall not occur on the same joist.

2508.5.3 Blocking of Perimeter Edges

All perimeter edges shall be blocked using a wood member not less than 2-inch by 6-inch (51 mm by 159 mm) nominal dimension. Blocking material shall be installed flat over the top plate of the wall to provide a nailing surface not less than 2 inches (51 mm) in width for the attachment of the gypsum board.

2508.5.4 Fasteners

Fasteners used for the attachment of gypsum board to a horizontal diaphragm ceiling shall be as defined in Table 2508.5. Fasteners shall be spaced not more than 7 inches (178 mm) on center (o.c.) at all supports, including perimeter blocking, and not more than 3/8 inch (9.5 mm) from the edges and ends of the gypsum board.

2508.5.5 Lateral Force Restrictions

Gypsum board shall not be used in diaphragm ceilings to resist lateral forces imposed by masonry or concrete construction.

Related Code Sections


2508.5 Gypsum Board and Plaster, Horizontal Gypsum Board Diaphragm Ceilings
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