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Gypsum board is usually applied in single sheets directly on the framing members. On ceilings, the board is applied with the long dimension at right angles to the trusses or joists. When ceilings are strapped with 19 × 89 mm (1 × 4 in. nominal) lumber, the long dimension would run parallel to the trusses or joists. On walls it is more common to apply the sheets horizontally because horizontal joints are located at a convenient height for taping and sanding. Ends of sheets should terminate at a corner and always on a support.
Nail Attachment Gypsum board panels can be attached to wood members by nails or screws (Figure 164). Nails should be ringed, with 2.3 mm (3⁄32 in.) shanks and 5.5 mm (7⁄32 in.) diameter heads. The nails should be long enough to penetrate at least 20 mm (3⁄4 in.) into wood supports. Screws should be long enough to penetrate at least 15 mm (5⁄8 in.) into wood supports. The fastener heads are set slightly below the surface without damaging the paper so that a slight dimple is formed in the face of the board,
164 Application of drywall finish Vertical application and single nailing moderate contact space 150-200 mm (6 to 8 in.) o. c. recessed edge stud
Horizontal application and double nailing double-nailing pattern nail 50 mm (2 in.) apart 300 mm (12 in.) intervals nail or screw to stud recessed edge stud