NCIDQ IDFX Exam | Questions with 100% Correct Answers | Updated &Verified | 2024-
2025 | 100% Score
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
raised barrel hinge - ✔✔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 - ✔✔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 - ✔✔device to operate a door, hold in position & lock it
latchset - ✔✔ONLY holds door in place; NO lock (i.e. restroom partitions)
lockset - ✔✔special mechanism that allows the door to be locked with a KEY or THUMBTURN
mortise lockset - ✔✔installed in rectangular area cut out of door; more SECURE than cylindrical and
offers wider variety of locking options
cylindrical lockset - ✔✔most common; simple to install in holes drilled into door, relatively inexpensive,
most common in residential (like doors in home bedroom)
pre-assembled lockset - ✔✔rectangular box that fits within a notch cut in the edge of the door; easier to
install than mortise; door knob OR lever can be used
center hung pivot - ✔✔allow door to swing in either direction & is completely concealed
pivots CANNOT be used with a door stop (instead use a flexible strip of wool pile or synthetic stripping
can be rabbeted into the edge of the door) on the same side of the door with both jambs because it
makes it difficult to seal the door against sound or light transmission on the hinge and strike sides
door closers - ✔✔automatically return a door to its closed position after it is opened
control the DISTANCE a door can be OPENED & thereby protect the door and the surrounding
construction from damage
, door coordinator - ✔✔device that coordinates the closing sequence of the two doors so that they close
completely, rather than having the leaf with the astagral close first and prevent the other leaf from
closing
intumescent gasketing - ✔✔cannot be used alone; expands upon exposure to heat and forms a tight,
fire-resistant seal against the passage of smoke, gases, and heat
Fire rated glazing - ✔✔-wired: mesh of wire embedded in the middle of the sheet; NOT tempered &
doesn't qualify as safety glazing for hazardous locations
-tempered, fire protective glass
-glass block
glazing beads - ✔✔used to hold the glass in place
framing glass - ✔✔glass set in small channel or angle frames at the top and bottom and simply butt-
joined on sides
Fire Rated Doors - ✔✔1-hr rated exit access corridor or where a smoke & draft assembly is acquired: 20
minutes door rated
occupancy separation: 3/4-hr door rated
1 hr rated exit stair enclosure: 1 hr door rated
2 hr rated exit stair enclosure: 1 1/2 hr door rated
integrated ceilings - ✔✔suspended ceiling system specifically designed to accommodate acoustical
ceiling tile, light fixtures, supply & return air grilles, fire sprinklers and partition attachment in a
CONSISTENT, UNIFIED way
2025 | 100% Score
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
raised barrel hinge - ✔✔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 - ✔✔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 - ✔✔device to operate a door, hold in position & lock it
latchset - ✔✔ONLY holds door in place; NO lock (i.e. restroom partitions)
lockset - ✔✔special mechanism that allows the door to be locked with a KEY or THUMBTURN
mortise lockset - ✔✔installed in rectangular area cut out of door; more SECURE than cylindrical and
offers wider variety of locking options
cylindrical lockset - ✔✔most common; simple to install in holes drilled into door, relatively inexpensive,
most common in residential (like doors in home bedroom)
pre-assembled lockset - ✔✔rectangular box that fits within a notch cut in the edge of the door; easier to
install than mortise; door knob OR lever can be used
center hung pivot - ✔✔allow door to swing in either direction & is completely concealed
pivots CANNOT be used with a door stop (instead use a flexible strip of wool pile or synthetic stripping
can be rabbeted into the edge of the door) on the same side of the door with both jambs because it
makes it difficult to seal the door against sound or light transmission on the hinge and strike sides
door closers - ✔✔automatically return a door to its closed position after it is opened
control the DISTANCE a door can be OPENED & thereby protect the door and the surrounding
construction from damage
, door coordinator - ✔✔device that coordinates the closing sequence of the two doors so that they close
completely, rather than having the leaf with the astagral close first and prevent the other leaf from
closing
intumescent gasketing - ✔✔cannot be used alone; expands upon exposure to heat and forms a tight,
fire-resistant seal against the passage of smoke, gases, and heat
Fire rated glazing - ✔✔-wired: mesh of wire embedded in the middle of the sheet; NOT tempered &
doesn't qualify as safety glazing for hazardous locations
-tempered, fire protective glass
-glass block
glazing beads - ✔✔used to hold the glass in place
framing glass - ✔✔glass set in small channel or angle frames at the top and bottom and simply butt-
joined on sides
Fire Rated Doors - ✔✔1-hr rated exit access corridor or where a smoke & draft assembly is acquired: 20
minutes door rated
occupancy separation: 3/4-hr door rated
1 hr rated exit stair enclosure: 1 hr door rated
2 hr rated exit stair enclosure: 1 1/2 hr door rated
integrated ceilings - ✔✔suspended ceiling system specifically designed to accommodate acoustical
ceiling tile, light fixtures, supply & return air grilles, fire sprinklers and partition attachment in a
CONSISTENT, UNIFIED way
