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NCIDQ IDFX EXAM/415 QUESTIONS AND ANSWERS
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NCIDQ IDFX EXAM/415 QUESTIONS AND ANSWERS
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NCIDQ IDFX EXAM/415 QUESTIONS AND ANSWERSAdvantages 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 - -most common; simple to install in holes drilled into door,
relatively inexpensive, most common in residential (like doors in home
bedroom)
-pre-assembled - -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
-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
all proprietary systems intended to be used in commercial applications
where the partition lights & other elements connected to the ceiling change
FREQUENTLY
, all components designed for max. REUSABILITY & FLEXIBILITY
-stainless steel - -used for its corrosion resistance, strength & appearance
-brass & bronze - -predominantly copper
in practical use, many alloys that are really brass are referred to as bronze
although corrosion resistant, it changes color with age & exposure to
moisture in the air
-finish carpentry - -exposed wood construction assembled AT THE JOB SITE
(i.e. doors & windows, door & window trim, standard wood base & other
molding, site-built stairs & handrails)
-architectural woodwork - -CUSTOM, SHOP-fabricated millwork built of
lumber, finished wood & other materials
-Finish carpentry grade - -determines the type & number of allowable
defects
-B & better: excellent for natural finishes/paint (supply limited)
-C select: slightly more defects & usually best grade to specify for painting &
some natural finishes
vertical grain: tends to warp less, more abrasion resistant, stain more
uniformly, cut so annual growth rings are PERPENDICULAR to face of board
-plywood - --made from an odd # of layers of thin veneer glued together
under heat & pressure
-used in FINISH carpentry (door trims, etc.)
-particleboard - --composed of small wood particles, fibers, and CHIPS of
various sizes mixed together in a binder and formed under pressure into a
panel
-commonly used as a SUBSTRATE for natural and laminate veneers in
architectural woodwork construction (i.e. casework not built on site)
-most common, dimensionally stable; smooth surface; impact resistance
-MDF - --made from wood particles REDUCED to fibers (fluff) in a moderate-
pressure stream vessel and then combined with a resin and bonded together
under heat and pressure
-most DIMENSIONALLY STABLE
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