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NCIDQ IDFX Questions and Correct
Answers/ Latest Update / Already Graded
Advantages of Gypsum Drywall
Ans: 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
Ans: 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
Ans: 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
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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?
Ans: residential: 16" O.C.
commercial: 24" O.C.
Slip Joint
Ans: prevent wall from being damaged if the structural floor
deflects
Plaster Construction
Ans: 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
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Masonry Block Dimensions
Ans: 8"x8"x16" (-3/8" for mortar joints)
Demountable Partitions
Ans: 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
Ans: 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
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Ans: -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
Butt Hinge
Ans: 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
raised barrel hinge
Ans: used when there is not room for the barrel to extend past
the door trim; OFFSET to allow one leaf to be mortised into the
frame (kind of has an L shape on each side)
swing clear hinges
Ans: has a special shape that allows the door to swing 90
degrees or 95 degrees so the full opening of the doorway is
available
definition: latches & locksets
All rights reserved © 2025/ 2026 |
NCIDQ IDFX Questions and Correct
Answers/ Latest Update / Already Graded
Advantages of Gypsum Drywall
Ans: 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
Ans: 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
Ans: 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
All rights reserved © 2025/ 2026 |
, Page |2
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?
Ans: residential: 16" O.C.
commercial: 24" O.C.
Slip Joint
Ans: prevent wall from being damaged if the structural floor
deflects
Plaster Construction
Ans: 1. Scratch Coat
2. Brown Coat (level surface)
3. Finish Coat (Leveling & desired texture)
*Add Trim
All rights reserved © 2025/ 2026 |
, Page |3
Masonry Block Dimensions
Ans: 8"x8"x16" (-3/8" for mortar joints)
Demountable Partitions
Ans: 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
Ans: 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
All rights reserved © 2025/ 2026 |
, Page |4
Ans: -flat button (most common; typical)
-hospital
-oval head (typical)
-steeple
-flush
Butt Hinge
Ans: 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
raised barrel hinge
Ans: used when there is not room for the barrel to extend past
the door trim; OFFSET to allow one leaf to be mortised into the
frame (kind of has an L shape on each side)
swing clear hinges
Ans: has a special shape that allows the door to swing 90
degrees or 95 degrees so the full opening of the doorway is
available
definition: latches & locksets
All rights reserved © 2025/ 2026 |
