IDFX NCIDQ EXAM SCRIPT FULL
QUESTIONS AND CORRECT ANSWERS
DETAILED REVIEW SHEET
●● Advantages of gypsum wallboard
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
Answer: Standardized by Gypsum Association to specify the exact
requirements for any project based on level 0 - 5
●● Level 0 - Gypsum Wallboard
Answer: Requires no taping, finishing, or accessories
●● Level 1 - Gypsum Wallboard
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
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
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
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
,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
Answer: size: 4' x 8', 10', 12', 14'
Thickness: 1/4" - 5/8" (3/4" and 1" for 2 hr fire ratings)
●● LC bead
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
Answer: edge trim without back flange. Install post gyp install. Finish
with joint compound.
●● U Bead
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
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
Answer: Chemically identical to natural, mined gypsum but is a
byproduct of various manufacturing, industrial, or chemical processes.
●● flue gas desulfurization
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)
Answer: high-density gypsum reinforced with chopped glass fibers
QUESTIONS AND CORRECT ANSWERS
DETAILED REVIEW SHEET
●● Advantages of gypsum wallboard
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
Answer: Standardized by Gypsum Association to specify the exact
requirements for any project based on level 0 - 5
●● Level 0 - Gypsum Wallboard
Answer: Requires no taping, finishing, or accessories
●● Level 1 - Gypsum Wallboard
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
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
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
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
,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
Answer: size: 4' x 8', 10', 12', 14'
Thickness: 1/4" - 5/8" (3/4" and 1" for 2 hr fire ratings)
●● LC bead
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
Answer: edge trim without back flange. Install post gyp install. Finish
with joint compound.
●● U Bead
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
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
Answer: Chemically identical to natural, mined gypsum but is a
byproduct of various manufacturing, industrial, or chemical processes.
●● flue gas desulfurization
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)
Answer: high-density gypsum reinforced with chopped glass fibers
