National Gypsum Construction Guide
National Gypsum Construction Guide The entire - AECinfo.com
National Gypsum Construction Guide The entire - AECinfo.com
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09 29 00/NGC<br />
BUYLINE 1100<br />
RECOMMENDATIONS<br />
SINGLE LAYER WALLBOARD<br />
APPLICATION (also Base<br />
Layer of Double Layer)<br />
1. NAILS<br />
Nails shall be GWB-54 or<br />
cooler type located 3/8"<br />
min. to 1/2" max. from<br />
edges and ends of<br />
wallboard. Nails shall be a<br />
max. of 7" o.c. on ceilings<br />
and a max. of 8" o.c. on<br />
walls, except for “Double<br />
Nailing” Procedure.<br />
2. SCREWS<br />
Drywall screws for attaching<br />
gypsum wallboard to wood<br />
framing shall be 1 1/4",<br />
Type W spaced not to<br />
exceed 12" o.c. on ceilings,<br />
16" o.c. on sidewalls where<br />
studs are 16" o.c. and 12"<br />
o.c. on sidewalls where<br />
studs are spaced 24" o.c.<br />
Screws for attaching<br />
gypsum wallboard to<br />
gypsum wallboard shall be<br />
Type G spaced as required.<br />
3. STAPLES<br />
Base layer gypsum board may<br />
be applied with powerdriven<br />
staples spaced 7"<br />
o.c. on ceilings; 8" o.c. on<br />
sidewalls. Staples shall be<br />
U.S. Standard 16 gauge<br />
galvanized wire staples<br />
with 7/16" wide crown<br />
with legs having divergent<br />
points. Legs shall be not<br />
less than 1" long for 3/8"<br />
base board, 1 1/8" long for<br />
1/2" base board or 1 1/4"<br />
long for 5/8" base board.<br />
4. CORNERBEADS<br />
Cornerbead shall be nailed<br />
with gypsum wallboard<br />
nails spaced no greater<br />
than 9" apart on each<br />
flange of the bead with the<br />
nails opposite. In lieu of<br />
nailing, cornerbead may be<br />
crimp applied 6" o.c. with a<br />
special tool.<br />
5. ADHESIVE APPLICATION<br />
TO FRAMING<br />
A. Apply wallboard adhesive<br />
to the wood framing with a<br />
caulking gun.<br />
INSTALLATION<br />
FLOATING ANGLES<br />
No nails in shaded area.<br />
DOUBLE NAILING<br />
Minimizes nail-pop.<br />
SCREW APPLICATION<br />
Fast, positive, fewer<br />
heads to treat.<br />
ADHESIVE/NAIL-ON<br />
Ideal for prefinished boards.<br />
FLOATING INTERIOR<br />
ANGLES<br />
To minimize fastener popping<br />
in areas adjacent to wall<br />
and ceiling intersections,<br />
the floating angle method<br />
should be used for either<br />
single or double layer<br />
application of gypsum<br />
board to wood framing.<br />
This method is applicable<br />
where single nailing,<br />
double nailing or screw<br />
attachment is used.<br />
<strong>Gypsum</strong> board should be<br />
applied to ceiling first.<br />
REPAIRING NAIL-POPS<br />
Nail-pops are caused by<br />
lumber shrinkage after<br />
board application; loose<br />
gypsum board; improperly<br />
aligned, twisted or bowed<br />
framing; or improper<br />
nailing.<br />
Pops appearing before/during<br />
decoration should be<br />
repaired immediately.<br />
Those which occur after<br />
one or more month’s<br />
heating are usually caused<br />
by lumber shrinkage and<br />
should not be repaired until<br />
after heating season. To<br />
repair, renail about 1 1/2"<br />
from the popped nail along<br />
the framing while applying<br />
sufficient pressure adjacent<br />
to the nail to bring board in<br />
firm contact with the<br />
framing. If the popped nail<br />
was improperly driven,<br />
remove it. If properly<br />
driven, reseat just below<br />
the board face. Remove<br />
any loose material over<br />
reseated nail before treating<br />
nail heads with joint<br />
compound and<br />
redecorating.<br />
ADHESIVE NAIL-ON<br />
APPLICATION<br />
The adhesive nail-on system<br />
for application of gypsum<br />
wallboard to wood framing<br />
members strengthens the<br />
wall and minimizes the<br />
possibility of nail-popping.<br />
It reduces the number of<br />
nails in the field, provides<br />
for intimate contact and a<br />
continuous bond between<br />
the wallboard and wood<br />
framing. All surfaces that<br />
come in contact with the<br />
adhesive should be dry,<br />
free of dirt, grease, oil or<br />
other foreign materials.<br />
SCREW APPLICATION<br />
Drywall screws attach gypsum<br />
board to wood or steel<br />
framing or to other gypsum<br />
boards. They pull the board<br />
tightly to the supports,<br />
minimizing surface defects<br />
due to loose boards. When<br />
properly driven, they make<br />
a uniform depression free<br />
of ragged edges and fuzz.<br />
09 29 00<br />
NATIONAL GYPSUM WALLBOARD PRODUCTS<br />
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