GWB Flashcards
gwb sheet dimensions
4’x
8,10,12,14’
gwb thickness:
standard
¼, ⅜, ½, ⅝”
gwb dimensions for shaft enclosures
1” thick for shaft enclosures, 2’ widths.
gwb thickness:
2hr fire-rating.
3/4”
special bc replaces typ. two layer
gwb thickness:
most common commercial, high-end res.
⅝”
gwb thickness:
most common residential.
½”
gwb thickness:
double layer applications,
or when overlayed in remodeling.
⅜”
gwb thickness:
for curves,
and new finishes over old walls/ceilings.
¼”
fire-rated partitions. 2/3/4 hrs.
type X
gwb application to concrete/ masonry
mastic application
gwb application to wood/metal framing
nailed or screwed
gwb joints finished w
embedding paper/ fiberglass tape,
joint compound applied
gwb recycled paper surface used since date
1950’s
gwb qualities of recycled paper core
more rigid, identical other properties
main source of sythetic gypsum:
flue-gas desulfurization
7% of market
recycling gwb
pulverize into ≤ ½”, and work into ground as soil additive.
advantage wood framing over metal
wood double as load bearing, whereas metal not unless heavy-gage, structural steel.
typ metal framing gage
25 gage most common
metl gage stud shape
c-shaped, pre punched for conduit/wiring.
at floor/ceiling, framed into
runners
wallboard trim:
fabricated edging
corner bead types:
edge trim, finish w joint compound.
LC bead
corner bead types:
edge trim w/o back flange.
useful for installation after the wallboard has been installed.
finish w joint compound.
L bead
corner bead types:
edge trim for use with a kerfed jamb.
finish w joint compound.
LK bead
corner bead types:
edge trim that does not req finishing w joint compound.
does have noticeable edge.
aka J metal by contractors.
U bead
broad class of products, high-strength, high-density gyp reinforced,
glass-reinforced gypsum: (GRG)
glass-reinforced gypsum:
typ use
pre manufactured decorative elements, poured in molds.
ex. column covers, arches, coffered ceilings,
ornate moldings, light troughs, and trim.
