NCIDQ - IDFX (PART 2 OF 2)
gypsum wallboard - correct answer ✔✔The most common building material used for constructing
interior wall partitions and ceilings; also called drywall and sheetrock.
⅝" is most common size in commercial
Advantages of gypsum wallboard - correct answer ✔✔Low installation cost, quick and easy installation,
fire resistance, sound control capability, easy availability, versatility, ease of finishing and decorating, and
ease of installation of doors and other openings
GA-214 Recommended Level of Gypsum Board Finish - correct answer ✔✔Standardized by Gypsum
Association to specify the exact requirements for any project based on level 0 - 5
Level 0 - Gypsum Wallboard - correct answer ✔✔Requires no taping, finishing, or accessories
Level 1 - Gypsum Wallboard - correct answer ✔✔joints and interior angles have tape embedded in joint
compound with the surface free of excess joining compound;
Used for plenum above ceilings and other areas not normally open to view.
Level 2 - Gypsum Wallboard - correct answer ✔✔All joints and interior angles have tape embedded in
joint compound, and one separate coat of compound is applied over all joints/angles//fastener
heads/accessories
Used where water-resistant backing board is employed as a substrate for tile/areas where appearance is
not critical.
Level 3 - Gypsum Wallboard - correct answer ✔✔Similar to level 2, except 2 coats of joint compound are
used and the surface is free of tool marks and ridges;
,Used when surface will receive heavy-medium texture finishes OR when heavy-grade wall-covering to be
applied.
Level 4 - Gypsum Wallboard - correct answer ✔✔Similar to level 3, except 3 coats of joint is used
Used where light textures/wallcoverings will be applied or where the economy is of concern. gloss,
semigloss, and enamel paints NOT recommended over this level of finish.
Level 5 - Gypsum Wallboard - correct answer ✔✔Similar to level 4 except a thin skim coat of joint
compound is applied over the entire surface
Used where gloss, semigloss, enamel, or nontextured flat paints are specified/where severe lighting
conditions exist.
Typical Gypsum Board Size & Thickness - correct answer ✔✔size: 4' x 8', 10', 12', 14'
Thickness: 1/4" - 5/8" (3/4" and 1" for 2 hr fire ratings)
LC bead - correct answer ✔✔Edge trim requiring finishing with joint compound. It has a back flange, so it
must be fitted over the edge of the wallboard before the wallboard is fastened to the substrate.
L Bead - correct answer ✔✔edge trim without back flange. Install post gyp install. Finish with joint
compound.
U Bead - correct answer ✔✔Edge trim in which the edge of the metal is noticeable. Sometimes called J
metal by contractors. Does not require finishing with a joint compound
LK Bead - correct answer ✔✔Edge trim for use with various thicknesses of wallboard in a kerfed jamb
(one with a small slot cut in). It requires finishing with joint compound.
Synthetic Gypsum - correct answer ✔✔Chemically identical to natural, mined gypsum but is a byproduct
of various manufacturing, industrial, or chemical processes.
, flue gas desulfurization - correct answer ✔✔Nonregenrative systems, where the reagent is used to
remove the sulfur oxides from the gas stream is used and discarded; regenerative means that the
reagent is recovered and reused.
Power-generating plants (and similar plants) remove polluting gases from their stacks to reduce the
emission of harmful materials into the atmosphere. Allows the efficient use of refuse material that
would otherwise have to be discarded.
Glass-reinforced Gypsum (GRG) - correct answer ✔✔high-density gypsum reinforced with chopped glass
fibers
Used for decorative elements such as column covers, arches, coffered ceilings, ornate moldings, tight
troughs & trim. It is poured into molds to create cost effective pre-manufactured products
Plaster - correct answer ✔✔Finish made from various types of cementing compounds, fine aggregate,
and water.
Applied in 1-3 coats over several materials to create a smooth surface
Stucco - correct answer ✔✔Exterior plaster finish made of Portland cement
Plaster is made from - correct answer ✔✔Gypsum, lime, water, and aggregate of sand, vermiculite, or
perlite
Keene's cement - correct answer ✔✔A plaster that has a high resistance to abrasion and water
penetration.
Expanded Metal Lath - correct answer ✔✔punched metal that is stretched to open into a diamond
pattern to receive and hold plaster
Gypsum Lath - correct answer ✔✔a base for plaster consisting of a gypsum core sandwiched between
two sheets of heavy, porous paper.
gypsum wallboard - correct answer ✔✔The most common building material used for constructing
interior wall partitions and ceilings; also called drywall and sheetrock.
⅝" is most common size in commercial
Advantages of gypsum wallboard - correct answer ✔✔Low installation cost, quick and easy installation,
fire resistance, sound control capability, easy availability, versatility, ease of finishing and decorating, and
ease of installation of doors and other openings
GA-214 Recommended Level of Gypsum Board Finish - correct answer ✔✔Standardized by Gypsum
Association to specify the exact requirements for any project based on level 0 - 5
Level 0 - Gypsum Wallboard - correct answer ✔✔Requires no taping, finishing, or accessories
Level 1 - Gypsum Wallboard - correct answer ✔✔joints and interior angles have tape embedded in joint
compound with the surface free of excess joining compound;
Used for plenum above ceilings and other areas not normally open to view.
Level 2 - Gypsum Wallboard - correct answer ✔✔All joints and interior angles have tape embedded in
joint compound, and one separate coat of compound is applied over all joints/angles//fastener
heads/accessories
Used where water-resistant backing board is employed as a substrate for tile/areas where appearance is
not critical.
Level 3 - Gypsum Wallboard - correct answer ✔✔Similar to level 2, except 2 coats of joint compound are
used and the surface is free of tool marks and ridges;
,Used when surface will receive heavy-medium texture finishes OR when heavy-grade wall-covering to be
applied.
Level 4 - Gypsum Wallboard - correct answer ✔✔Similar to level 3, except 3 coats of joint is used
Used where light textures/wallcoverings will be applied or where the economy is of concern. gloss,
semigloss, and enamel paints NOT recommended over this level of finish.
Level 5 - Gypsum Wallboard - correct answer ✔✔Similar to level 4 except a thin skim coat of joint
compound is applied over the entire surface
Used where gloss, semigloss, enamel, or nontextured flat paints are specified/where severe lighting
conditions exist.
Typical Gypsum Board Size & Thickness - correct answer ✔✔size: 4' x 8', 10', 12', 14'
Thickness: 1/4" - 5/8" (3/4" and 1" for 2 hr fire ratings)
LC bead - correct answer ✔✔Edge trim requiring finishing with joint compound. It has a back flange, so it
must be fitted over the edge of the wallboard before the wallboard is fastened to the substrate.
L Bead - correct answer ✔✔edge trim without back flange. Install post gyp install. Finish with joint
compound.
U Bead - correct answer ✔✔Edge trim in which the edge of the metal is noticeable. Sometimes called J
metal by contractors. Does not require finishing with a joint compound
LK Bead - correct answer ✔✔Edge trim for use with various thicknesses of wallboard in a kerfed jamb
(one with a small slot cut in). It requires finishing with joint compound.
Synthetic Gypsum - correct answer ✔✔Chemically identical to natural, mined gypsum but is a byproduct
of various manufacturing, industrial, or chemical processes.
, flue gas desulfurization - correct answer ✔✔Nonregenrative systems, where the reagent is used to
remove the sulfur oxides from the gas stream is used and discarded; regenerative means that the
reagent is recovered and reused.
Power-generating plants (and similar plants) remove polluting gases from their stacks to reduce the
emission of harmful materials into the atmosphere. Allows the efficient use of refuse material that
would otherwise have to be discarded.
Glass-reinforced Gypsum (GRG) - correct answer ✔✔high-density gypsum reinforced with chopped glass
fibers
Used for decorative elements such as column covers, arches, coffered ceilings, ornate moldings, tight
troughs & trim. It is poured into molds to create cost effective pre-manufactured products
Plaster - correct answer ✔✔Finish made from various types of cementing compounds, fine aggregate,
and water.
Applied in 1-3 coats over several materials to create a smooth surface
Stucco - correct answer ✔✔Exterior plaster finish made of Portland cement
Plaster is made from - correct answer ✔✔Gypsum, lime, water, and aggregate of sand, vermiculite, or
perlite
Keene's cement - correct answer ✔✔A plaster that has a high resistance to abrasion and water
penetration.
Expanded Metal Lath - correct answer ✔✔punched metal that is stretched to open into a diamond
pattern to receive and hold plaster
Gypsum Lath - correct answer ✔✔a base for plaster consisting of a gypsum core sandwiched between
two sheets of heavy, porous paper.
