Georgia-Pacific DensArmor Plus Interior Panels - Manual (Page 3)

1 ⁄
2 9 (12.7 mm) DensArmor Plus ® may be applied to 249
(610 mm) o.c. joists as long as it is installed across or
per pendicular to ceiling joists as shown.
All nails should be “dimpled”. That is, drive the nails firm
enough to indent the board’s facer without tearing it. It’s
best to install board on the ceiling before installing board
on the wall.
It also helps to have a pair of T-braces to help hold the
board in place while it’s being nailed. A good T-brace can
be made by nailing a 28 (610 mm) piece of 19 x 49 (25 mm
x 102 mm) onto the end of a 29 x 49 (51 mm x 102 mm).
Install boards across (perpendicular to) ceiling joists.
Walls
Nail the board around the edges
(about
3 ⁄
8 9 [9.5 mm] from the
edge), and along each end.
Space fasteners at 89 (203 mm)
intervals at the ends, edges
and field of the panel. Fasteners
should be driven so that the
heads are slightly below the
surface.
Many professionals prefer screws to nails for their
extremely strong holding power. For screw application,
use only drywall screws.
Install boards horizontally or vertically, running across the
wall studs.
Masonry
If you’re installing gypsum
board on a masonry wall,
first cut 19 x 29 (25 mm x
51 mm) or 29 x 29 (51 mm
x 51 mm) furring strips to
reach from the floor to the
ceiling. 519 x 519 (25 mm
x 51 mm) strips are good if
you plan to back your drywall with insulation.) Cut enough
strips to go around the room when nailed vertically on
169 (406 mm) centers. Nail the strips on the walls, 169
(406 mm) o.c., using masonry nails. (Check with your
home supply dealer for the proper nails for your kind of
masonry wall.) When the furring strips are up, rigid foam-
board insulation and fiberglass insulation can be cut and
placed between strips. Then treat the furring as you
would ordinary wall studs, using the application methods
described in the “Walls” section.
Cornerbead
To protect outside corners from edge damage, install
cornerbeads after you’ve installed the drywall. Nail the
cornerbead every 59 (127 mm) through the gypsum
board, into the wood framing.
Finishing
The finishing and sanding of DensArmor Plus panels
should be performed in accordance with the most current
version of Gypsum Association Publication GA-214-07
“Recommended Levels of Gypsum Board Finish.”
DensArmor Plus panels may be finished with either
paper tape embedded with all purpose joint compound
or with fiberglass mesh tape and setting compound.
Because of the enhanced properties of DensArmor Plus
Interior Panels, drying times for the joint and setting
compounds may vary slightly. It is essential to allow
each coat of compound to dry thoroughly before applying
additional coats of compound. Care should be taken to
ensure that all joints and fasteners are properly and
adequately sanded to provide a smooth transition
between the compound and the face of the board.
Option 1 — Paper Tape
Joints
Finish the joints in four steps. First, apply a coat of joint
compound to the joints. Then, immediately imbed paper
tape in the joint compound, smooth out bubbles and
allow to dry. Next, apply two successive finish coats
over the tape and allow to dry
between coats. Sand when dry.
Bedding
With your 59 (127 mm) joint finishing
knife, apply a smooth, full, even coat
of joint compound into the recess
created by the tapered edges of
adjoining boards.
Center a strip of paper tape over the joint, and press it
firmly into the wet bedding compound with your drywall
knife at a 45° angle. Press hard enough to squeeze a little
compound out from the edge of the tape, but leave enough
compound for a good bond. Let dry about 24 hours.
Taping and Finishing
When the taped bedding coat is dry, apply your first
finish coat of all-purpose joint compound. Extend this
coat a few inches beyond the tape, and feather the
edges. Let dry about 24 hours. Then apply a second
finish coat with your 109 (254 mm) joint finishing knife.
Extend this coat 1
1 ⁄
2 9 (38 mm) wider than the first finish
coat. Wait 24 hours, and sand lightly with your sanding
block and medium grit sandpaper.
Don’t sand down
to the tape. Wipe off dust with a damp sponge.
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Insulation