NCIDQ IDFX Exam Questions and Answers
with Verified Solutions | Latest Updated 2026
Advantages of Gypsum Drywall low install cost, quick & easy installation,
fire
resistance, sound control capability, easy
availability, versatility, ease of finishing &
decorating, ease of installation of
doors/other
openings
Gypsum Drywall Edges Tapered: Most common; tapered on face
side
along the long dimension of the panel &
square
edges at the end; allows for application of
reinforcing tape & joint compound without
causing
bulges at joints
Square: used where appearance is NOT a
factor,
for basic layers of 2-layer applications &
for veneer
plaster work
,Levels of Gypsum Drywall 1: plenums above ceilings & other areas
not
normally open to view (tape embedded in
joint
compound w/ surface free of excess
compound
2. water resistant backing board (all joints
& angles
have tape embedded in joint & one
separate coat
of compound
3. heavy or medium textured
finishes/heavy-grade
wallcovering ( 2 coats of compound)
4. Light textured or wallcoverings & where
economy is concerned (3 layers)
5. all paints, severe lighting conditions (4
layers)
Studs are spaced how far apart? residential: 16" O.C.
commercial: 24" O.C.
Slip Joint prevent wall from being damaged if the
structural
floor deflects
Plaster Construction 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
Masonry Block Dimensions 8"x8"x16" (-3/8" for mortar joints)
, Demountable Partitions Consists of a system of individual
components that
can be quickly assembled, disassembled &
reused
with nearly total salvageability
consists of floor runners, ceiling runners,
stud
sections with clips to hold panels, &
prefinished
gyp. wallboard panels
uses aluminum for framing
Definition: Hinges Consist of 2 leaves with an odd number of
knuckles
on one leaf and an even number of
knuckles on the
other
knuckles are attached with a pin
knuckle + pin = barrel (finished with tip)
Types of Hinge Tips -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
Butt Hinge MOST COMMON; has both leaves fully
mortised
into the frame and the edge of the door so
the
hinge is flush with the surface of the frame
and
door
with Verified Solutions | Latest Updated 2026
Advantages of Gypsum Drywall low install cost, quick & easy installation,
fire
resistance, sound control capability, easy
availability, versatility, ease of finishing &
decorating, ease of installation of
doors/other
openings
Gypsum Drywall Edges Tapered: Most common; tapered on face
side
along the long dimension of the panel &
square
edges at the end; allows for application of
reinforcing tape & joint compound without
causing
bulges at joints
Square: used where appearance is NOT a
factor,
for basic layers of 2-layer applications &
for veneer
plaster work
,Levels of Gypsum Drywall 1: plenums above ceilings & other areas
not
normally open to view (tape embedded in
joint
compound w/ surface free of excess
compound
2. water resistant backing board (all joints
& angles
have tape embedded in joint & one
separate coat
of compound
3. heavy or medium textured
finishes/heavy-grade
wallcovering ( 2 coats of compound)
4. Light textured or wallcoverings & where
economy is concerned (3 layers)
5. all paints, severe lighting conditions (4
layers)
Studs are spaced how far apart? residential: 16" O.C.
commercial: 24" O.C.
Slip Joint prevent wall from being damaged if the
structural
floor deflects
Plaster Construction 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
Masonry Block Dimensions 8"x8"x16" (-3/8" for mortar joints)
, Demountable Partitions Consists of a system of individual
components that
can be quickly assembled, disassembled &
reused
with nearly total salvageability
consists of floor runners, ceiling runners,
stud
sections with clips to hold panels, &
prefinished
gyp. wallboard panels
uses aluminum for framing
Definition: Hinges Consist of 2 leaves with an odd number of
knuckles
on one leaf and an even number of
knuckles on the
other
knuckles are attached with a pin
knuckle + pin = barrel (finished with tip)
Types of Hinge Tips -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
Butt Hinge MOST COMMON; has both leaves fully
mortised
into the frame and the edge of the door so
the
hinge is flush with the surface of the frame
and
door
