My Library

which will be filled with joint compound (Figure 165). The fasteners at the recessed edge of the sheet may be driven with the heads flush since they will be covered with tape and joint compound. Gypsum board may be “double-nailed,” that is, nails are driven in pairs about 50 mm (2 in.) apart at the required intervals (Figure 164). For ceilings, double nails are spaced no more than 300 mm (12 in.) on centre along the supports. For walls, double nails are spaced no more than 300 mm (12 in.) on centre. For single-nailing, the ceiling nails are spaced no more than 180 mm (7 in.) on centre and for walls, at 200 mm (8 in.) on centre. Where gypsum board provides required bracing in braced wall panels in areas exposed to high wind or earthquake forces, the nail spacing must not be more than 200 mm (8 in.).
Screw Attachment Special drywall screws are often used to fasten gypsum board using screw guns. Screws are usually spaced 300 mm (12 in.) on centre at both the edge and intermediate supports. The distance can be increased to 400 mm (16 in.) on walls when the supports are not more than 400 mm (16 in.) on centre. Where gypsum board provides required bracing in braced wall panels in areas exposed to high wind or earthquake forces, the screw spacing must not be more than 300 mm (12 in.). If two layers of gypsum board are needed, such as for sound control or additional fire rating, fasten the boards in the usual manner with nails or screws. The fasteners for the second layer must penetrate as much as for the first layer.
165 Finishing of gypsum board Indent nail or drywall screw
Taping inside corner
sharp fold Typical joint
stud gypsum board recessed edge joint cement tape joint cement feather edge