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Part 3
APPLICATION

1. WORKMANSHIP
   Gypsum board shall be installed by mechanics skilled in this trade in accordance with CSA A82.31, ASTM C-840, or Gypsum Association GA216 Specification and the following standards.
    
2. COLD WEATHER APPLICATION
   Gypsum board and joint filler shall not be applied to surfaces that are damp or contain frost. In cold weather, ensure heating is provided to maintain a temperature of at least 10ºC., but not in excess of 14ºC., for seven days prior to and during application of boards and joint treatment, and for at least four days thereafter. (See Note 14)
   
   When temporary heating equipment is employed, ensure precautions are taken to avoid local concentration of heat by means of deflectors or protective screens. Ensure suitable ventilation is provided to ensure normal drying conditions.
    
3. GENERAL APPLICATION
   Plan the installation to avoid butt-end joints if possible, to reduce the amount of joint finishing.
   
   Do not locate joints on same stud on opposite sides of parititons. Stagger end joints occurring on same side of parititons.
   
   Keep vertical joints at least 300mm (12”) from the jamb lines of door, window and other openings.
   
   Cut sheets to fit accurately; butt edges of boards in moderate contact; do not force into place. Remove ragged edges or burrs with rasp or sandpaper.
   
   Isolate gypsum board from exterior metal windows and door frames. If not covered by any other means, use rigid PVC ‘J’ moulding at junction between board and frames. (See Note 15)
   
   Gypsum board shall be cut by scoring and breaking, or by sawing, working from the face side. When cut by scoring, the face paper shall be cut through with a sharp knife or sharp instrument. The gypsum board shall then be snapped back away from the cut face. Cutouts for pipes, fixtures, or other small openings shall be scored in outline on both sides before knocking out, or shall be cut out with a saw.
   
   Except when the spacing of nailing members does not exceed 400mm (16”) on centre, in single layer construction, and for the first layer of multiple layer construction, all ends and edges of gypsum board shall occur over fastening or nailing members. This is not required for edges at right angles to framing members in horizontal application.
   
   Gypsum board 12.7mm (1/2”) or 15.9mm (5/8”) thickness, attached to ceiling supports which are spaced more than 400mm (16”) on centre, shall be erected with the length of the sheet at right angles to the supports.