USG Manufactured Housing Handbook User Manual

Page 20

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joint compound over the previous
coat in an inside corner. This combi-
nation of tools allows you to apply a
consistent finishing coat to both
sides of the angle at once.

Attach the corner finisher to the
angle applicator, then fill the angle
applicator using a hand pump
attached to a box-filler adapter.
Keeping the corner finisher head
over the edge of the joint compound
bucket, pump until the applicator is
full.

Because the angle applicator is a
pressure-controlled tool, it is impor-
tant that you apply even pressure
when using it. Hold the applicator
with both hands, one near the end of
the handle and the other close to the
applicator. When the corner finisher
is placed in the corner, all blades
should be flush with the sides of the
angle. The applicator and corner fin-
isher should be centered in the angle
being finished, with no tilt to either
side.

For easiest operation, keep the han-
dle at a 45° angle, and the corner
finisher set flush in the angle.

Vertical Angles
To finish a vertical angle, position the
corner finisher (attached to the angle
applicator) near the bottom of the
vertical angle, with the blade end
closest to the floor. Applying even
pressure, pull up about 3

Љ-4Љ and

sweep the corner finisher away from
the angle.

Turn the angle applicator around and
position the corner finisher in the top
of the angle. Pull it down through the
top of the compound applied in the
first stroke, and sweep it away from
the angle.

Horizontal Angles
For a horizontal angle, position the
corner finisher (attached to the angle
applicator) in one corner of the
angle. Apply even pressure to the
applicator and pull it toward the
opposite corner. Near the end of the
opposite corner, sweep the corner
finisher away from the angle.

Turn the angle applicator around,
position it in the opposite corner,
apply even pressure, and pull it
through the end of the compound
applied in the first stroke. Sweep the
angle applicator away from the angle.

Nail Spotter

The nail spotter is a small box that is
used for filling fastener depressions.
It works best when all fasteners are
set at the correct depth. As the box is
dragged down a row of fasteners, a
thin layer of compound fills the
holes. The attached blade smoothes
the compound.

The nail spotter can be filled with
compound using a pump and
adapter.

To finish a row of fasteners, set the
box at the desired angle to the han-
dle, and position the nail spotter
against the wallboard at the begin-

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At the end of the joint, you must cut
the tape against an attached blade.

Flat (Box) Finishers

Finishing boxes are used to apply
joint compound to flat taped joints.
They come in a variety of widths, up
to 12

Љ, to serve a variety of purposes.

(For instance, a 7

Љ box might be used

to apply a bedding coat, a 10

Љ box to

apply a finish coat, and a 12

Љ box to

apply a skim coat.)

The box is controlled with specially
designed handles available in various
lengths (including long handles suit-
able for working overhead on ceiling
joints). As you apply pressure to the
box handle, compound is pushed
onto the wall. The lever on the handle
end will lock the box at the desired
angle. The box may also have an
adjustment wheel to control the
amount of crown left by the box; you
may need to experiment with the
adjustment wheel to find the opti-
mum setting for a particular task.

Load the box with joint compound
through the opening behind the
blade, using a hand pump and a box
adapter or “nipple.”

Ceiling Joints and Horizontal
Wall Joints
To apply compound, position the flat
box at the end of the joint being fin-
ished and apply pressure with the
handle to start the flow of compound.
The tool should be positioned so that
the wheels are leading and the blade
trailing. Draw the flat box steadily

along the joint while applying even
pressure with the handle. This will
dispense the compound at a steady
rate. The handle should lead the box,
except at the ends of joints.

Near the middle of the joint, lock the
angle of the box by pulling on the
lever, and gradually decrease pres-
sure while moving the box from the
surface in a sweeping motion.

Reversing position, begin again at
the other end of the joint. Draw the
box along until you have passed the
previous stopping point. To achieve a
smooth joint, a double pass is some-
times necessary.

Again, decrease pressure and sweep
the box away from the surface.

Vertical Wall Joints
To finish a vertical wall joint, start
from the bottom and move upward,
covering the joint as high as is com-
fortable, to a height of about 30

Љ.

Lock and sweep the box from the
surface and begin again at the top of
the joint. Draw the box down the joint
until you reach the previous stopping
point. Lock and sweep the box from
the surface, joining the two finished
sections.

Door and Window Openings
For door and window openings,
always work from the corner, moving
toward the opening. Just before the
wheels reach the opening, lock the
box, lift the wheels, and sweep the
box away from the wall.

Angle Applicator or Corner Pump (With
Corner Finisher)

An angle applicator or corner pump
is used in conjunction with a corner
finisher to apply a uniform layer of

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