Nevada C-17C Drywall Contractor Examination

Under NAC 624.340, what work does Nevada C-17C authorize that distinguishes it from C-17a lathing and C-17b plastering?

• ASelection and application of wood or metal lath only, with no coating of the base
• BApplication of sand-cement-lime plaster and the lath that receives it
• CPainting, wallcovering, and decorative coating of already-finished interiors
• DInstallation and coating of gypsum wallboard and sheathing, including suspended gypsum-bo…

When hanging gypsum panel products on both ceilings and walls of the same room, which sequence does GA-216 require?

• AHang whichever surface is fire-rated first, regardless of location
• BHang walls and ceiling in any order if joints will be taped the same day
• CApply panels to the ceiling first, then to the walls
• DApply wall panels first so the ceiling can rest on the wall edges

IBC 2018 Table 2508.1 requires gypsum board and gypsum panel products to be installed in accordance with which pair of standards?

• AGA-600 alone, without an application standard
• BGA-216 and ASTM C840
• CASTM C926 and ASTM C1063
• DASTM C841 and ASTM C842 only

Per IBC 2018 Section 2508.2.1, when may gypsum wallboard, gypsum lath, or gypsum plaster be installed?

• AOnly after weather protection for the installation is provided
• BAs soon as the roof sheathing is nailed, even if the building is open to rain
• CAny time the ambient temperature is above freezing
• DImmediately after concrete is placed, while the slab is still curing wet

What is the minimum distance from a gypsum panel edge or end to a fastener, per GA-216?

• A1/8 inch (3 mm)
• B3/4 inch (19 mm)
• C1-1/2 inches (38 mm)
• D3/8 inch (10 mm)

What does a perpendicular gypsum-panel application mean?

• APanels are laminated face-to-face with no framing
• BPanels are hung only on steel studs, never on wood
• CPanel edges run at right angles to the framing members
• DPanel edges run parallel to the framing members

What makes Type X gypsum board different from regular gypsum wallboard?

• AA thinner 1/4-inch panel used only for curves
• BA core formulated for greater fire resistance as defined in ASTM C1396
• CA plastic face that does not need joint treatment
• DA cementitious core that can replace plaster in showers

How must gypsum panel products be stored on a C-17C job after delivery?

• AStacked flat on risers, dry, and protected from weather, sun, and condensation
• BStood on the long edge against a stud wall so air can circulate
• CLeft in the plastic rail-shipment wrap in the weather until hang day
• DLeaned on end in the garage so the tapered edges do not crush

What is the minimum nominal thickness of wood supports for lath, gypsum board, or gypsum panel products under IBC 2018 2504.1.1?

• A1 inch in the least dimension for all members
• B3-1/2 inches, because only 2x4 studs are permitted
• C5/8 inch, matching Type X board thickness
• D2 inches in the least dimension

For single-layer gypsum panels nailed to wood studs, what is the maximum nail spacing on walls?

• A12 inches on center
• B16 inches on center
• C8 inches on center
• D7 inches on center

For single-layer gypsum panels nailed to wood ceiling joists, what is the maximum nail spacing?

• A16 inches on center
• B7 inches on center
• C8 inches on center
• D12 inches on center

Wood framing is 16 inches on center. What is the maximum screw spacing for single-layer gypsum panels?

• A12 inches on center on ceilings and 16 inches on center on walls
• B8 inches on center on both ceilings and walls
• C16 inches on center on ceilings and 24 inches on center on walls
• D7 inches on center on ceilings and 8 inches on center on walls

Wood framing is 24 inches on center. What is the maximum screw spacing for single-layer gypsum panels on both walls and ceilings?

• A16 inches on center
• B24 inches on center
• C8 inches on center
• D12 inches on center

Per GA-216 Table 1, what is the maximum framing spacing for 1/2-inch gypsum panels on a ceiling when the panels run parallel to the framing?

• A12 inches on center
• B19.2 inches on center
• C16 inches on center
• D24 inches on center

Per GA-216 Table 1, 5/8-inch gypsum panels may be applied on a ceiling with framing at 24 inches on center only when the panels are oriented how?

• ADiagonally across the joists
• BPerpendicular to the framing
• CParallel to the framing
• DEither parallel or perpendicular, without restriction

Unless a control joint is placed at the opening, how close may a gypsum-panel joint come to the corner of a window or door?

• ANo joint within 12 inches of the corner
• BJoints may land on the corner if they are taped Level 4
• CNo joint within 2 inches of the corner
• DJoints must align with the head and jamb of every opening

How must gypsum-panel joints be arranged on opposite faces of a wood or steel partition?

• AJoints must stack on the same stud so one fastener row serves both faces
• BJoints may align if both faces receive Type X board
• COnly the face layer of a double-layer wall must stagger
• DJoints on opposite sides shall not occur on the same stud

How far above the floor must the bottom edge of wall gypsum panels be held?

• AA minimum of 2 inches for a base-trim chase
• BFlush with the finish floor after the flooring is installed
• CA minimum of 1/4 inch
• DTight to the subfloor with no gap

Using the floating-angle method with single nailing, where is the first fastener placed at a ceiling-to-wall intersection?

• AOnly into the top plate, with no fasteners in the first ceiling joist
• BNot more than 7 inches from the intersection on the ceiling and not more than 8 inches do…
• CIn both the ceiling and the wall within 1 inch of the intersection
• DOmitted on the ceiling and 16 inches down the wall

When may the floating-angle method not be used?

• AWhere fire ratings or shear values are required
• BOn any ceiling hung perpendicular to the joists
• CWhenever Type S screws are used instead of nails
• DOn partitions that will receive only a Level 1 finish

For a horizontal gypsum-board diaphragm ceiling under IBC 2018 2508.6.4, fasteners shall be spaced not more than which distance on center at all supports, including perimeter blocking?

• A12 inches
• B16 inches
• C24 inches
• D7 inches

A rectangular room is 12 feet by 16 feet with 8-foot walls. Estimate 4-foot by 8-foot gypsum sheets for the four walls only, ignore openings, and add 10 percent waste. How many sheets should be ordered?

• A18 sheets
• B12 sheets
• C16 sheets
• D14 sheets

A room is 18 feet by 22 feet with 8-foot ceilings. Take off walls and the flat ceiling with 4-foot by 12-foot sheets, ignore openings, and add 10 percent waste. How many sheets are required?

• A20 sheets
• B24 sheets
• C22 sheets
• D28 sheets

A 50-foot by 10-foot partition must receive two layers of 5/8-inch Type X on each face (a four-layer takeoff). Using 4-foot by 8-foot sheets and 10 percent waste, how many sheets should be ordered?

• A69 sheets
• B63 sheets
• C55 sheets
• D80 sheets

IBC 2018 2508.5 requires joints and fasteners of fire-resistance-rated gypsum assemblies to be treated. Which condition is a listed exception that allows untreated joints?

• AOn any single-layer Type X wall, because Type X does not need tape
• BWhenever the finish will be flat latex paint
• COn ceilings only, if the attic is sprinkled
• DOn multilayer systems where the joints of adjacent layers are offset

Per IBC 2018 Table 2508.6, what is the listed shear value of a 1/2-inch gypsum-board ceiling diaphragm with framing at 16 inches on center?

• A200 pounds per linear foot of ceiling
• BShear values are not assigned to gypsum ceilings
• C90 pounds per linear foot of ceiling
• D70 pounds per linear foot of ceiling

In a multi-layer gypsum application where adjacent layers run in the same direction, how far must joints be offset between layers?

• AOnly the face layer must have joints; the base layer may run wild
• BHorizontal joints offset not less than 12 inches and vertical joints offset not less than…
• CAll joints stacked so fasteners hit the same framing twice
• DEnd joints offset 2 inches and edges may align

Per GA-216 Table 4, what is the maximum weight of unsupported insulation that a single layer of 1/2-inch gypsum wallboard may carry when ceiling framing is 24 inches on center?

• A1.6 pounds per square foot
• B2.2 pounds per square foot
• C4.4 pounds per square foot
• DThere is no published insulation-weight limit

What minimum penetration into the framing is required for screws attaching gypsum panels?

• A3/8 inch into wood and 5/8 inch into steel
• B1-1/2 inches into both wood and steel
• CFlush with the face of the stud is sufficient
• D5/8 inch into wood and 3/8 inch into steel

Per GA-216 Table 5, what are the minimum nail and screw lengths for fastening 1/2-inch gypsum panels to wood framing?

• A1-1/2-inch nails and 1-1/4-inch screws
• B2-inch nails and 1-5/8-inch screws
• C1-3/8-inch nails and 1-1/8-inch screws
• D1-1/4-inch nails and 1-inch screws

What does GA-214 Level 0 require?

• AA full skim coat over the entire surface
• BNo taping, finishing, or accessories
• CTape embedded in compound with tool marks left exposed
• DTape plus two coats of compound over joints

Which finish level is commonly called fire-taping?

• ALevel 1 — tape embedded in joint compound, tool marks and ridges acceptable
• BLevel 0 — no tape at all
• CLevel 4 — three coats ready for flat paint
• DLevel 5 — skim coat for gloss paint

Which GA-214 finish is the usual specification under flat or eggshell paint in occupied rooms?

• ALevel 1
• BLevel 2
• CLevel 0
• DLevel 4

What additional step distinguishes GA-214 Level 5 from Level 4?

• AUsing only mesh tape and no compound
• BLeaving tool marks so the painter can hide them
• CA thin skim coat of joint compound, or a manufactured skim-coat material, over the entire…
• DSkipping tape at fastener heads

How is paper joint tape applied under GA-216 20.5.1?

• AApply paper tape only on butt ends; tapered edges need no tape
• BButter the joint with compound, center and embed the tape, and wipe off the excess, leavi…
• CStick the dry paper to the board and coat over it later
• DStaple the paper to the face, then apply setting-type compound only at the edges

What is the principal difference between setting-type and drying-type joint compounds?

• ASetting-type hardens by chemical reaction; drying-type hardens by evaporation of water
• BSetting-type is only for paint; drying-type is only for plaster
• CDrying-type cannot be sanded; setting-type cannot be recoated
• DThey are interchangeable names for the same ready-mix product

What minimum room temperature does GA-216 require for joint treatment and for laminating gypsum panels?

• A32°F (0°C) so long as the compound does not freeze in the bucket
• B70°F (21°C) with no exception
• C40°F (4°C) for joint treatment and 32°F for hanging
• D50°F (10°C) beginning 48 hours before mixing and held until the materials are dry

May drying-type and setting-type joint compounds be mixed together on a C-17C coating job?

• AYes, if the blend is used only on fastener heads
• BOnly when coating veneer plaster base
• CNo, unless the joint-compound manufacturer specifically recommends it
• DYes, in any ratio, to speed drying of ready-mix

What must be applied to a finished gypsum-panel surface before paint or water-based texture?

• ANothing; joint compound is already a primer
• BA good-quality drywall primer compatible with the finish
• CA second skim coat of topping compound in place of primer
• DA solvent-based varnish to seal the paper

Which GA-214 finish is typically specified under ceramic tile or in a garage where appearance is secondary?

• ALevel 2 — tape embedded, wiped with a thin coat, fastener heads covered once
• BLevel 5 — full skim for gloss
• CLevel 0 — no tape
• DLevel 4 is mandatory under all tile

A specification calls for a medium spray texture on gypsum walls. What is the minimum GA-214 finish under that texture?

• ALevel 1 — fire-tape only
• BLevel 0 — texture will hide everything
• CLevel 5 — skim coat is required under every texture
• DLevel 3 — two coats over tape and two coats over fasteners, surface free of tool marks

Self-adhering glass-mesh joint tape must be covered with which compound?

• AReady-mix all-purpose compound exclusively
• BGypsum veneer plaster ASTM C587
• CSetting-type joint compound forced through the mesh to fill the joint
• DDrying-type topping only, with no fill under the mesh

How far beyond the joint center should the second coat of compound extend?

• AFlush with the tape edges only
• BApproximately 3-1/2 inches (90 mm)
• CApproximately 1 inch (25 mm)
• DApproximately 12 inches (300 mm)

When a third coat is specified, how far from the joint center should that coat be feathered?

• AApproximately 6 inches (150 mm)
• BApproximately 2 inches (50 mm)
• CApproximately 3-1/2 inches (90 mm), same as the second coat
• DAcross the entire sheet (a skim coat)

How many coats of joint compound does GA-216 require over fastener heads for a finished surface, and how are they applied?

• AOne heavy coat that fills the dimple in a single pass
• BTwo coats only, both pulled in the same direction
• CNo compound on fasteners if paper tape covers them
• DThree coats, each applied in a different direction, with each coat dry or set before the…

Which tape is preferred for interior angles on a C-17C coating job?

• AMetal corner bead crimped into the inside corner
• BNo tape; a heavy fill of topping compound is enough
• CPaper tape folded into the angle and embedded in compound
• DSelf-adhering mesh tape only, with no compound in the corner

When may the next coat of drying-type joint compound be applied?

• AOnly after 7 days of moist curing, as with cement plaster
• BOnly after the previous coat has dried thoroughly
• CAs soon as the surface skins over, even if the core is wet
• DImmediately, because drying-type does not shrink