USG Manufactured Housing Handbook User Manual

Page 7

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Staple Attachment
Drywall can be secured using sta-
ples; however, wide-crown fas-
teners are difficult to conceal dur-
ing finishing. Use minimum 7/16

crown staples with 1-1/8

Љ legs for

1/2

Љ and 3/8Љ gypsum board, and

with 1-1/4

Љ legs for 5/8Љ board.

Space staples 7

Љ o.c. for walls

and ceilings.

6 Adhesive Attachment

The use of adhesive to attach
gypsum panels to wood framing
can reduce, or, in some cases,
eliminate the number of mechani-
cal fasteners required. The table
below provides general guidelines
for the spacing of mechanical fas-
teners used in conjunction with
adhesives. The recommendations
of the adhesive manufacturer
must be followed.

Caution: Certain wall and ceiling
assemblies in a manufactured
home are designed to resist wind
and transportation loads. These
assemblies must be constructed
in accordance with the specifica-
tions outlined in the test report
chosen by the design engineer.
General guidelines do not apply to
these assemblies.

A urethane foam adhesive is avail-
able for attaching gypsum panels to
wood framing. A two-component
urethane adhesive is spray-applied
to the intersection between the side
of the framing member and the back
of the gypsum panel. Immediately
after spraying, the urethane foams in
place to create a fillet-type of bond.
Mechanical fasteners are not typi-
cally required when using this
method. Take precautions to avoid
framing displacement during the
foaming process. Contact the adhe-
sive manufacturer for equipment
requirements and installation
instructions.

Select the proper adhesive for spe-
cific job requirements. Make sure
that framing is clean, sound and free
from oil, dirt or contamination. Apply
adhesive and fasteners per instruc-
tions on adhesive cartridge. Do not
use adhesive alone to secure panels
unless specifically recommended by
the adhesive manufacturer.

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Gypsum Wallboard
Installation
General recommendations for
gypsum panels applied to wood
framing:
– Cut boards so that they touch

but are not forced into position.
Butt all joints loosely.

– Whenever possible, place

tapered or wrapped edges next
to one another.

– Whenever possible, apply

boards perpendicular to framing
and in lengths that will span
ceilings and walls without creat-
ing end (butt) joints. If butt joints
do occur, stagger and locate
them as far from the center of
walls and ceilings as possible.

– Support all ends and edges of

gypsum board on framing,
except long edges at right
angles to framing and where
end joints are to be floated
between frame members and
back-blocked.

– When fastening, apply hand

pressure on panel next to fas-
tener being driven to ensure
panel is in tight contact with
framing member.

– If metal trim is to be installed

around edges, doors, or windows,
determine if trim is to be installed
before panel application.

– Do not anchor panel surfaces

across the flat grain of wide
dimensional lumber such as floor
joists and headers. Float panels
over these members or provide a
control joint to compensate for
wood shrinkage.

Measurements—All measurements
must be accurate. Make two mea-
surements as a check. Measure
across the diagonal corners of wall
and ceiling framing laid out on the
assembly fixture. This procedure will
usually warn of assemblies that are
out of square. Then, framing correc-
tions can be made before the board
is attached.

Cutting—Make straight-line cuts
across full width or length of board by
scoring the face paper, snapping the
board core, and then cutting the back
paper. The common tool used to
score and cut gypsum board is a util-
ity knife with replaceable blade.
Regardless of the type of knife used,

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Maximum Fastener Spacing
Gypsum Panel Constructions—Wood Framing

Maximum Fastener Spacing

Construction

Fastener

Gypsum Panels

Type

Location

in.

Single Layer—

nails

ceilings

178

Mechanically Attached

sidewalls

203

screws

ceilings

305

sidewalls

406

Single Layer—

nails/

ceilings

Љ or 406 mm o.c. at ends,

Adhesively Attached

screws

(perpendicular)

edges—1 field fastener per
frame member at mid-width
of board

ceilings

Љ or 406 mm o.c. along each

(parallel)

edge and 24

Љ or 610 mm o.c.

along intermediate framing

walls

Љ or 406 mm o.c. at ends,

(perpendicular)

edges—1 field fastener per
frame member at mid-width of
board