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Title: Section 2511  •  Size: 7064

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SECTION 2511 - GYPSUM WALLBOARD

2511.1 General. Gypsum wallboard shall not be installed on exterior surfaces. See Section 224. For use as backing under stucco, see Section 2506.3.

Gypsum wallboard shall not be installed until weather protection for the installation is provided.

2511.2 Supports. Supports shall be spaced not to exceed the spacing set forth in Table 25-G for single-ply application and Table 25-H for two-ply application. Vertical assemblies shall conform with Section 2503. Horizontal assemblies shall comply with Section 2504.

2511.3 Single-ply Application. All edges and ends of gypsum wallboard shall occur on the framing members, except those edges and ends which are perpendicular to the framing members. All edges and ends of gypsum wallboard shall be in moderate contact except in concealed spaces where fire-resistive construction or diaphragm action is not required.

The size and spacing of fasteners shall conform with Table 25-G except where modified by fire-resistive construction meeting the requirements of Section 703.2. Fasteners shall be spaced not less than 3/8 inch (10 mm) from edges and ends of gypsum wallboard. Fasteners at the top and bottom plates of vertical assemblies, or the edges and ends of horizontal assemblies perpendicular to supports, and at the wall line may be omitted except on shear-resisting elements or fire-resistive assemblies. Fasteners shall be applied in such a manner as not to fracture the face paper with the fastener head.

Gypsum wallboard may be applied to wood-framing members with an approved adhesive. A continuous bead of the adhesive shall be applied to the face of all framing members, except top and bottom plates, of sufficient size as to spread to an average width of 1 inch (25 mm) and thickness of 1/16 inch (1.6 mm) when the gypsum wallboard is applied. Where the edges or ends of two pieces of gypsum wallboard occur on the same framing member, two continuous parallel beads of adhesive shall be applied to the framing member. Fasteners shall be used with adhesive application in accordance with Table 25-G.

2511.4 Two-ply Application. The base of gypsum wallboard shall be applied with fasteners of the type and size as required for the nonadhesive application of single-ply gypsum wallboard. Fastener spacings shall be in accordance with Table 25-H except where modified by fire-resistive construction meeting the requirements of Section 703.2.

The face ply of gypsum wallboard may be applied with gypsum wallboard joint compound or approved adhesive furnishing full coverage between the plies or with fasteners in accordance with Table 25-H. When the face ply is installed with joint compound or adhesive, the joints of the face ply need not occur on supports. Temporary nails or shoring shall be used to hold face ply in position until the joint compound or adhesive develops adequate bond.

2511.5 Joint Treatment. Gypsum wallboard single-layer fire-rated assemblies shall have joints treated.

EXCEPTION: Joint treatment need not be provided when any of the following conditions occur:

1. Where the wallboard is to receive a decorative finish such as wood paneling, battens, acoustical finishes or any similar application which would be equivalent to joint treatment.

2. Joints occur over wood-framing members.

3. Assemblies tested without joint treatment.

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