National Gypsum Construction Guide - 12th Edition

RECOMMENDATIONS
SINGLE LAYER GYPSUM
BOARD APPLICATION (also
Base Layer of Double Layer)
1. NAILS
Nails shall be GWB-54 or
cooler type located 3/8"
min. to 1/2" max. from
edges and ends of board.
Nails shall be a max. of 7"
o.c. on ceilings and a max.
of 8" o.c. on walls, except
for “Double Nailing”
Procedure.
2. SCREWS
Drywall screws for attaching
gypsum board to wood
framing shall be 1 1/4",
INSTALLATION
FLOATING ANGLES
No nails in shaded area.
DOUBLE NAILING
Minimizes nail-pop.
SCREW APPLICATION
Fast, positive, fewer
heads to treat.
102 NATIONAL GYPSUM BOARD PRODUCTS
Type W spaced not to
exceed 12" o.c. on ceilings,
16" o.c. on sidewalls where
studs are 16" o.c. and 12"
o.c. on sidewalls where
studs are spaced 24" o.c.
Screws for attaching
gypsum board to gypsum
board shall be Type G
spaced as required.
3. STAPLES
Base layer gypsum board may
be applied with powerdriven
staples spaced 7"
o.c. on ceilings; 8" o.c. on
sidewalls. Staples shall be
U.S. Standard 16 gauge
galvanized wire staples
ADHESIVE/NAIL-ON
Ideal for prefinished boards.
with 7/16" wide crown
with legs having divergent
points. Legs shall be not
less than 1" long for 3/8"
base board, 1 1/8" long for
1/2" base board or 1 1/4"
long for 5/8" base board.
4. CORNERBEADS
Cornerbead shall be nailed
with gypsum board nails
spaced no greater than 9"
apart on each flange of the
bead with the nails
opposite. In lieu of nailing,
cornerbead may be crimp
applied 6" o.c. with a
special tool.
FLOATING INTERIOR
ANGLES
To minimize fastener popping
in areas adjacent to wall
and ceiling intersections,
the floating angle method
should be used for either
single or double layer
application of gypsum
board to wood framing.
This method is applicable
where single nailing,
double nailing or screw
attachment is used.
Gypsum board should be
applied to ceiling first.
REPAIRING NAIL-POPS
Nail-pops are caused by
lumber shrinkage after
board application; loose
gypsum board; improperly
aligned, twisted or bowed
framing; or improper
nailing.
Pops appearing before/during
decoration should be
repaired immediately.
Those which occur after
one or more month’s
heating are usually caused
by lumber shrinkage and
should not be repaired until
after heating season. To
repair, renail about 1 1/2"
from the popped nail along
the framing while applying
sufficient pressure adjacent
to the nail to bring board in
firm contact with the
framing. If the popped nail
5. ADHESIVE APPLICATION
TO FRAMING
A. Apply gypsum board
adhesive to the wood
framing with a caulking
gun.
was improperly driven,
remove it. If properly
driven, reseat just below
the board face. Remove
any loose material over
reseated nail before treating
nail heads with joint
compound and
redecorating.
ADHESIVE NAIL-ON
APPLICATION
The adhesive nail-on system
for application of gypsum
board to wood framing
members strengthens the
wall and minimizes the
possibility of nail-popping.
It reduces the number of
nails in the field, provides
for intimate contact and a
continuous bond between
the gypsum board and
wood framing. All surfaces
that come in contact with
the adhesive should be dry,
free of dirt, grease, oil or
other foreign materials.
SCREW APPLICATION
Drywall screws attach gypsum
board to wood or steel
framing or to other gypsum
boards. They pull the board
tightly to the supports,
minimizing surface defects
due to loose boards. When
properly driven, they make
a uniform depression free
of ragged edges and fuzz.