Nevada B-6 Commercial Remodeling Contractor Examination

Per ACI 318-14 Table 20.6.1.3.1, what is the specified concrete cover for cast-in-place nonprestressed reinforcement that is cast against and permanently in contact with the ground?

• A3 inches
• B2 inches
• C1-1/2 inches
• D3/4 inch

A B-6 crew is placing an interior concrete topping. Per ACI 318-14 Section 26.12.2, samples for strength tests of each mixture placed each day shall be taken at least once a day, once for each 5,000 square feet of slab or wall surface, and at least once for each:

• A50 cubic yards of concrete
• B75 cubic yards of concrete
• C150 cubic yards of concrete
• D300 cubic yards of concrete

Unless the contract documents specify otherwise, how long should ordinary portland-cement concrete for an interior remodel topping be kept moist after finishing?

• ANot less than 7 days
• BUntil the bleed water disappears, then uncovered
• C24 hours, then the slab may dry freely
• D28 days of continuous ponding only

An interior commercial remodel specifies a 1-1/2-inch concrete topping over a 28-foot by 22-foot room. Allowing 8 percent waste, how many cubic yards should be ordered?

• A2.4 cubic yards
• B2.6 cubic yards
• C2.8 cubic yards
• D3.1 cubic yards

IBC 2012 Section 1907.1 requires a vapor retarder under an interior concrete floor slab on ground. What is the minimum polyethylene thickness and the minimum joint lap stated in that section?

• A6-mil polyethylene lapped not less than 6 inches
• B4-mil polyethylene lapped 4 inches
• C10-mil polyethylene lapped 2 inches
• D15-pound felt lapped 12 inches

For a non-loadbearing interior masonry partition in a commercial remodel with ordinary exposure, which ASTM C270 mortar type is the general-purpose choice?

• AType N
• BType M
• CType K
• DType O only, with no alternatives

Per ACI 530.1 / TMS 602, cleanouts are required at the bottom of grout cells when the grout pour height exceeds:

• A32 inches
• B4 feet 0 inches
• C5 feet 4 inches
• D8 feet 0 inches

ACI 530 / TMS 402 treats masonry as laid in running bond when the overlap of units in successive courses is at least:

• AOne-eighth of the unit length
• BOne-half of the unit length, with no lesser overlap permitted
• COne-fourth of the unit length
• DThe full unit length so head joints align

How many nominal 8-inch by 8-inch by 16-inch concrete masonry units are required for a 24-foot-long by 8-foot-high interior partition, counting only full-face units and ignoring openings and waste?

• A216 units
• B192 units
• C168 units
• D144 units

What are the actual specified dimensions of a nominal 8-inch by 8-inch by 16-inch concrete masonry unit?

• A8 inches by 8 inches by 16 inches
• B7-1/2 inches by 7-1/2 inches by 15-1/2 inches
• C7-3/4 inches by 7-3/4 inches by 15-3/4 inches
• D7-5/8 inches by 7-5/8 inches by 15-5/8 inches

Which screw type is the correct fastener for attaching gypsum panels to 25-gauge cold-formed steel studs?

• AType W coarse-thread wood screws
• BType G gypsum-to-gypsum screws only
• CType S fine-thread steel screws
• DCommon nails with a minimum 1-1/4-inch penetration

For a nonstructural interior partition in a commercial remodel, which cold-formed steel stud designation is the typical non-loadbearing framing member?

• A25-gauge (18-mil) interior studs
• B12-gauge structural studs
• CHot-rolled W8×18 wide-flange columns
• D10-gauge moment-frame posts

Why do manufacturers punch knockouts in the webs of interior cold-formed steel studs?

• ATo reduce the stud to a loadbearing structural member
• BTo create a tested fire-door frame anchorage slot
• CTo allow electrical conduit, low-voltage cable, and bridging to pass through the web on a…
• DTo serve as the only approved control-joint location in the gypsum finish

A straight interior partition is 56 feet long and framed with steel studs at 16 inches on center. Including the starter stud, how many studs are required before adding extra studs at corners, doors, or intersecting walls?

• A42 studs
• B44 studs
• C43 studs
• D56 studs

What is the standard on-center spacing for wood or steel studs in a nonstructural interior commercial partition unless the drawings show otherwise?

• A12 inches
• B48 inches
• C30 inches
• D16 inches

For interior finish carpentry in a conditioned commercial space, kiln-dried millwork is typically specified to be installed at about what moisture content?

• A6 to 12 percent
• B19 to 25 percent
• CAbove 30 percent, the fiber-saturation point
• DAny moisture content, because interior wood does not move

Where should wood blocking be installed so grab bars in a commercial toilet room can meet accessibility mounting loads?

• AOnly in the ceiling cavity above the fixture
• BBlocking is never required if toggle bolts are used in 1/2-inch gypsum
• COn the room side of the finished gypsum after tile is grouted
• DIn the wall at the specified grab-bar heights, usually about 33 to 36 inches above the fi…

Per IBC 2012 Section 718.2.2, fireblocking in concealed stud-wall spaces shall be provided vertically at the ceiling and floor levels, and horizontally at intervals not exceeding:

• A4 feet
• B25 feet
• C16 feet
• D10 feet

A 48-foot interior partition needs a single bottom plate and a double top plate of 2x4 stock sold in 16-foot lengths. Ignoring waste from defects, how many 16-foot plates should be ordered?

• A6 pieces
• B8 pieces
• C9 pieces
• D12 pieces

When hanging commercial wall cabinets on an interior remodel wall, what is the preferred support method?

• ADrywall nails into 1/2-inch gypsum only
• BFinish nails into the gypsum joint compound
• CAdhesive caulk along the cabinet back rail with no mechanical fasteners
• DScrews or lag fasteners into studs or into solid blocking installed in the wall

A suspended acoustical ceiling is being installed in a commercial remodel. Unless the listing says otherwise, main runners are typically supported by hangers spaced not more than:

• A2 feet on center
• B12 feet on center
• C8 feet on center
• D4 feet on center

A 36-foot-long interior wall is framed 16 inches on center. Including the end stud, how many studs are in the straight run before adding door or intersection extras?

• A27 studs
• B24 studs
• C36 studs
• D28 studs

Which statement best describes the Nevada B-6 commercial remodeling classification in NAC 624.170?

• AIt authorizes interior remodeling of structures, including buildings over three stories,…
• BIt authorizes unlimited structural, mechanical, and fire-sprinkler work in any commercial…
• CIt is limited to dwellings not more than three stories and one story below grade
• DIt authorizes only exterior envelope and roofing work

IBC 2012 Section 1404.2 requires a water-resistive barrier behind exterior wall coverings. What material does that section name as the prescriptive barrier?

• AOne layer of No. 15 asphalt felt complying with ASTM D226, or other approved material
• BA single coat of interior latex paint
• CUnfaced R-13 fiberglass batts
• D6-mil polyethylene on the interior face of every climate zone

How does IBC 2012 Section 1405.3 classify a vapor retarder with a permeance of 0.05 perm?

• AClass I
• BClass II
• CClass III
• DClass IV

Unless the designer locates it otherwise, on which side of an insulated exterior wall is a Class I or II vapor retarder generally placed in a heating-dominated climate?

• AOn the exterior face, outboard of the water-resistive barrier
• BVapor retarders are prohibited on all exterior walls
• CIn the center of the stud cavity only
• DOn the interior (warm-in-winter) side of the insulation

IBC 2012 Section 720 generally limits the flame-spread index of thermal and sound-insulating materials to not more than:

• A25
• B75
• C200
• D450

What is the standard slope used to drain a shower receptor or wet-area mortar bed toward the drain?

• A1/8 inch per foot
• BNo slope is required if a waterproof membrane is used
• C1 inch per foot
• D1/4 inch per foot

Which ANSI material specification covers load-bearing, bonded, waterproof membranes used under tile in wet areas?

• AANSI A118.1
• BANSI A118.3
• CANSI A136.1
• DANSI A118.10

Elastomeric joint sealants used at exterior and wet-area perimeters of a commercial remodel are typically specified to ASTM:

• AC920
• BC36
• CD226
• DE84

When foam plastic insulation is used in an interior remodel, IBC 2012 Chapter 26 generally requires it to be separated from the interior with a thermal barrier equivalent to:

• A1/2-inch gypsum board, or another approved 15-minute thermal barrier
• B15-pound asphalt felt only
• CA coat of interior flat paint
• DNo thermal barrier is ever required if the foam is painted

An insulated metal-stud partition is 52 feet long and 9 feet high. Using unfaced batts that cover 40 square feet per bag and allowing 10 percent waste, how many bags should be ordered?

• A10 bags
• B12 bags
• C13 bags
• D15 bags

Through-wall flashing in masonry veneer should discharge at weepholes. What is a commonly specified maximum spacing for those weepholes?

• A8 inches on center
• B16 inches on center
• C33 inches on center
• D8 feet on center

What is the primary purpose of weatherstripping a newly installed commercial exterior door in a remodel?

• ATo increase the door’s fire-protection rating by one hour
• BTo allow the door to swing against the direction of egress
• CTo replace the need for a threshold
• DTo reduce air and water leakage at the head, jambs, and sill

In a commercial toilet-room remodel, where should the waterproofing or waterproof tile membrane turn up at walls and extend at the floor?

• AStop the membrane at the tile edge with no wall turn-up
• BOmit membrane if cement backer board is used
• CApply membrane only on the ceiling above the fixtures
• DTurn the membrane up the walls and treat the floor as a pan so water cannot reach the sub…

Per IBC 2012 Section 1008.1.1, what is the minimum clear opening width of a swinging means-of-egress door, measured from the face of the door to the stop with the door open 90 degrees?

• A28 inches
• B48 inches
• C36 inches
• D32 inches

Per IBC 2012 Section 1008.1.2, a door shall swing in the direction of egress travel when it serves:

• AAny room with an occupant load of 10 or more
• BOnly doors that are also fire doors
• COnly Group R dwelling units
• DAn occupant load of 50 or more, or a Group H occupancy

Per IBC 2012 Section 1008.1.7, the threshold at a required means-of-egress door shall be not more than how high above the finished floor, and how must a taller rise within that limit be shaped?

• A1/4 inch maximum, square-edged
• B2 inches maximum if a carpet transition is used
• C1 inch maximum, square-edged
• D1/2 inch maximum; rises above 1/4 inch beveled at a slope not steeper than 1:2

What fire-protection rating is typically required for a swinging door in a 1-hour fire-partition corridor wall under IBC 2012 Table 716.5?

• A20 minutes (1/3 hour)
• B45 minutes
• C90 minutes
• D3 hours

Per IBC 2012 Section 1008.1.3, the force to push or pull open an interior swinging egress door, other than a fire door, shall not exceed:

• A5 pounds
• B15 pounds
• C30 pounds
• D50 pounds

IBC 2012 Section 2406 requires safety glazing in hazardous locations. Which of the following is a hazardous location?

• AA small transom lite 8 feet above the floor in a private office
• BWired glass in a 3-hour fire wall where fire windows are not permitted
• CAny window in a fourth-story exterior wall regardless of size or sill height
• DGlazing in a door, and glazing within 24 inches of a door vertical edge whose bottom is l…

What does a 5/8-inch Type X gypsum panel provide that a 1/2-inch regular panel does not?

• AA glass-fiber core formulated for the fire-resistance listings used in 1-hour assemblies
• BA waterproof core that replaces tile membranes in showers
• CA structural sheathing rating that lets the B-6 contractor remove beams
• DA vapor permeance of zero

Per GA-216, when framing is 16 inches on center, screws attaching single-layer gypsum to wood or steel framing shall be spaced not more than:

• A6 inches on center on walls and 6 inches on ceilings
• B32 inches on center on walls only
• C24 inches on center on walls and ceilings
• D12 inches on center on ceilings and 16 inches on center on walls

Per ASTM C840 and GA-216, control joints shall be installed in an uninterrupted interior gypsum wall or partition when the straight-plane length exceeds:

• A10 feet
• B20 feet
• C30 feet
• D60 feet

Which GA-214 level of gypsum finish includes tape, two separate coats over joints, fastener covers, and a thin skim coat over the entire surface?

• ALevel 1
• BLevel 3
• CLevel 4
• DLevel 5