National Gypsum Construction Guide

2. Laminating is an excellent
way to apply Durasan, the
vinyl-surfaced gypsum
wallboard boards. This
method eliminates any
visible attachment.
3. Sta-Smooth Compound
or Sta-Smooth Lite is
recommended for
laminating as well as for
joint treatment where fast
hardening is required.
FINISH LAYER TAPERED EDGE
GYPSUM WALLBOARD
CEILING JOISTS
LIMITATIONS
1. Joints of succeeding layers
must not fall at the same
location. For greatest
strength, it is recommended
that the boards of
each layer be staggered so
that joints of each layer are
at least 10" apart.
2. During cold weather,
maintain a room
temperature of not less
than 40˚F during
mechanical attachment of
gypsum wallboard, and
between 50˚F and 70˚F
for 48 hours before
lamination, joint treatment,
texturing and decoration,
and continuously thereafter
until completely dry.
BASE
PROFORM JOINT TREATMENT
(ALL JOINTS AND CORNERS)
BASE LAYER
GYPSUM
WALLBOARD
LAMINATING
ADHESIVE
2 X 4 WOOD
FRAMING
WOOD
SOUND TRANSMISSION CLASS 45
FIRE RESISTANCE RATING 1 HR.
SOUND TRANSMISSION CLASS 58
FIRE RESISTANCE RATING 2 HRS.
1/2" FIRE-SHIELD C WALLBOARD 2 LAYERS 5/8" FIRE-SHIELD WALLBOARD
1/4" GYPSUM WALLBOARD
2 X 4, 16" O.C.
3 1/2" MINERAL WOOL
OR GLASS FIBER
2 X 4 PLATE
4D NAILS 12" O.C.
JOINT COMPOUND
CAULKING
CAULKING
102 NATIONAL GYPSUM WALLBOARD PRODUCTS