NCIDQ - IDFX (PART 2 OF 2) Exam Questions
and Answers with Verified Solutions | Latest
Updated 2026
gypsum wallboard The most common building material used
for
constructing interior wall partitions and
ceilings;
also called drywall and sheetrock.
■" is most common size in commercial
Advantages of gypsum wallboard 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 Standardized by Gypsum Association to
Gypsum Board Finish specify the
exact requirements for any project based
on level
0-5
Level 0 - Gypsum Wallboard Requires no taping, finishing, or
accessories
,Level 1 - Gypsum Wallboard 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 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 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 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 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 & size: 4' x 8', 10', 12', 14'
Thickness Thickness: 1/4" - 5/8" (3/4" and 1" for 2 hr
fire ratings)
LC bead 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 edge trim without back flange. Install post
gyp
install. Finish with joint compound.
and Answers with Verified Solutions | Latest
Updated 2026
gypsum wallboard The most common building material used
for
constructing interior wall partitions and
ceilings;
also called drywall and sheetrock.
■" is most common size in commercial
Advantages of gypsum wallboard 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 Standardized by Gypsum Association to
Gypsum Board Finish specify the
exact requirements for any project based
on level
0-5
Level 0 - Gypsum Wallboard Requires no taping, finishing, or
accessories
,Level 1 - Gypsum Wallboard 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 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 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 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 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 & size: 4' x 8', 10', 12', 14'
Thickness Thickness: 1/4" - 5/8" (3/4" and 1" for 2 hr
fire ratings)
LC bead 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 edge trim without back flange. Install post
gyp
install. Finish with joint compound.
