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Nails,
screws and adhesives are used to put gypsum board on interior walls and
ceilings. Gypsum board should not be applied until the moisture content
in the wall or ceiling framing is less than 15 percent. Low wood
moisture content reduces nail pop ups in the gypsum board. Nail spacing
is the same in horizontal and vertical gypsum board applications but
different for ceilings or walls. Gypsum horizontal and vertical wall
nails are spaced 150 mm to 200 mm apart and ceiling nails are spaced
125 mm to 175 mm apart. Nails are placed no closer to the edge of the
board than 10 mm . Screws are placed no further apart than 300 mm on
ceilings, and 400 mm on walls, when studs and joists are 400 mm on
centre. Screws are placed no further apart than 300 mm when studs are
600 mm on centre. Full sheets of horizontal gypsum boards are better at
reducing the number of wall vertical joints than vertical boards. Place
the joints at windows and doors. If that is not possible, stagger them
on the wall studs and other framing members. Gypsum board edges are
centred on studs and other framing members. Use nailing blocks between
studs when the stud spacing is greater than 400 mm and the board
thickness is less than 10 mm. When a single gypsum board layer is
applied, put it on the ceiling before covering the walls. Unattached ceiling
gypsum boards can be held in place by braces that are 25 mm longer than
the height of the ceiling. 2 ply laminated board applications require a
9.5 mm thick vertical panel undercourse and a horizontal 9.5 mm finish
panel. Some undercourses are used because of their sound deadening
capability. Nails are driven below the surface of the finish panel to form a
small dimple. Dimples and/or panel joints are filled and finished with
joint cement, perforated tape and sanding when the panel application is
completed.
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