Download PrepIQ Nevada NV C‑17 Lathing Plastering Contractor Ultimate Exam and more Exams Technology in PDF only on Docsity!
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Question 1. In a Nevada C-17 project, which drawing typically shows the location of the finish schedule for plaster surfaces? A) Structural framing plan B) Architectural floor plan C) Mechanical layout D) Electrical riser diagram Answer: B Explanation: The architectural floor plan includes finish schedules that specify plaster types, textures, and thicknesses for each wall surface. Question 2. When performing a quantity takeoff for lath, the contractor must calculate the surface area of which component? A) Only the exposed studs B) The total wall area before openings are subtracted C) The net wall area after deducting doors, windows, and penetrations D) Only the ceiling area Answer: C Explanation: Net wall area excludes openings so the correct amount of lath material can be ordered. Question 3. The Nevada Building Code amendment for exterior stucco requires a minimum air-space behind the lath to prevent moisture accumulation. What is the minimum required gap? A) 1/8 inch B) 1/4 inch C) 3/8 inch D) 1/2 inch
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Answer: B Explanation: A 1/4-inch ventilated air space is mandated to allow drainage and drying behind exterior stucco systems. Question 4. Which specification detail controls the minimum thickness of the scratch coat in a traditional three-coat stucco system? A) ASTM C 926 B) IBC Section 1403. C) Local amendment 23- 4 - A D) Manufacturer’s data sheet Answer: C Explanation: Local amendments often prescribe minimum scratch-coat thickness (commonly 3/8 inch) for Nevada jurisdictions. Question 5. In sequencing work, which trade must finish installing electrical boxes before the lathing crew begins on interior walls? A) Plumbing B) HVAC C) Electrical D) Roofing Answer: C Explanation: Electrical boxes must be set prior to lath installation so the lath can be wrapped around or anchored to them. Question 6. Expanded metal lath is preferred for plastering over wood studs when the spacing between studs exceeds:
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Question 9. Tie wires used to secure lath to studs should be: A) 12-gauge stainless steel, spaced no more than 12 inches apart B) 16-gauge galvanized, spaced no more than 8 inches apart C) 20-gauge copper, spaced no more than 6 inches apart D) 14-gauge aluminum, spaced no more than 10 inches apart Answer: B Explanation: 16-gauge galvanized tie wires are standard, with a maximum spacing of 8 inches for adequate support. Question 10. The C-17f channel and stud framing system is primarily used for: A) Load-bearing exterior walls B) Non-structural interior fire-resistive partitions C) Roof decking D) Foundation forms Answer: B Explanation: C-17f steel channel and studs create fire-resistive, non-structural interior partitions that receive plaster. Question 11. Which accessory is installed at the top of an exterior stucco wall to allow water drainage? A) Corner bead B) Weep screed C) Control joint D) Casing bead
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Answer: B Explanation: A weep screed provides a path for moisture to escape from behind the stucco. Question 12. In an interior plaster wall, a corner bead is installed to: A) Provide a waterproof seal B) Reinforce the corner and produce a crisp edge C) Act as a fire-stop D) Allow movement for thermal expansion Answer: B Explanation: Corner beads protect the plaster edge and create a straight, durable corner finish. Question 13. Grade-D building paper used as a moisture barrier behind exterior lath must be installed with: A) Overlap of at least 2 inches horizontally and 4 inches vertically B) No overlap, but taped seams C) Overlap of at least 6 inches in both directions, sealed with roofing cement D) Overlap of 1 inch only at seams Answer: C Explanation: A 6-inch overlap in both directions, sealed with roofing cement, ensures a continuous moisture barrier. Question 14. The correct sand-to-cement ratio for a traditional scratch coat in Nevada’s arid climate is: A) 1: B) 2:
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Question 17. In a one-coat proprietary stucco system, the base coat must be applied at a minimum thickness of: A) 1/8 inch B) 1/4 inch C) 3/8 inch D) 1/2 inch Answer: C Explanation: Manufacturers typically require at least a 3/8-inch base coat to ensure adequate strength. Question 18. When using a chemical bonding agent on a smooth concrete substrate, the agent should be applied: A) After the first coat of plaster has dried B) Immediately before the plaster mix is placed C) Only on the edges of the wall D) Mixed directly into the plaster Answer: B Explanation: The bonding agent must be wet when the plaster is applied to create a chemical bond. Question 19. Moist curing of plaster in Nevada’s climate is most effectively achieved by: A) Applying a plastic sheet over the surface for 24 hours B) Spraying water continuously for 48 hours C) Covering with a wet burlap blanket for 12-24 hours D) Using a heat gun to speed drying
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Answer: C Explanation: A wet burlap blanket retains moisture and provides gentle curing, minimizing shrinkage. Question 20. The “dash” texture is created by: A) Dragging a trowel in a circular motion while the plaster is wet B) Spraying sand onto a tack coat and pressing with a brush C) Applying a thin coat of lime wash and stippling with a sponge D) Rolling a steel roller over a semi-dry finish coat Answer: B Explanation: Dash texture involves sprinkling sand onto a tack coat and lightly pressing it to embed the particles. Question 21. Which gypsum board type is required for a fire-rated wall assembly in a Nevada commercial building? A) Standard gray board B) Green moisture-resistant board C) Type-X board D) Blue acoustic board Answer: C Explanation: Type-X gypsum board contains glass fibers and provides a 1-hour fire rating per code. Question 22. When hanging gypsum board on a ceiling, the recommended screw spacing is: A) 6 inches on center at all edges B) 8 inches on center near walls, 12 inches in field
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Question 25. Level 3 finish (Level 3) for gypsum wall surfaces is defined as: A) No visible joints, smooth to touch B) Minor surface imperfections allowed, suitable for low-light areas C) Visible joints with a light texture, acceptable for painted walls D) Rough texture with pronounced joint lines Answer: C Explanation: Level 3 allows a light texture and visible joints; it is acceptable for painted interior walls. Question 26. In a suspended ceiling system, the main component that supports the grid is the: A) Perimeter wall angle B) Main runner C) Cross-tee D) Hanger wire Answer: D Explanation: Hanger wires suspend the main runners from the structural ceiling, supporting the entire grid. Question 27. Acoustical ceiling tiles are typically attached using: A) Construction adhesive only B) Mechanical clips in the grid system C) Nails through the tile into the joists D) Screws directly into the tile Answer: B
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Explanation: Acoustic tiles are held in place by the suspended grid’s metal clips. Question 28. Cementitious fireproofing applied to structural steel must achieve a minimum fire-rating of: A) 30 minutes B) 1 hour C) 2 hours D) 3 hours Answer: B Explanation: Most Nevada building codes require a minimum 1-hour fire rating for steel members protected with cementitious fireproofing. Question 29. Which method is NOT an acceptable way to apply cementitious fireproofing on steel? A) Spray-on using a high-pressure pump B) Hand-troweled thick coat C) Brush-on thin coat D) Pre-mixed panels attached with mechanical fasteners Answer: D Explanation: Pre-mixed panels are not a method for applying cementitious fireproofing; the material must be applied directly to the steel. Question 30. In an EIFS system, the primary purpose of the drainage plane is to: A) Provide structural support for the finish coat B) Allow water that penetrates the outer layer to escape C) Increase thermal resistance of the wall assembly
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Question 33. Under OSHA Table 1 for silica exposure, a worker who performs plaster sanding for 2 hours per day is required to wear: A) No respirator, because exposure is below the limit B) A disposable N-95 mask C) A half-face air-purifying respirator with a P100 filter D) A full-face supplied-air respirator Answer: C Explanation: Even short durations of silica-containing dust require a P100 filter respirator per OSHA Table 1. Question 34. Which scaffolding component must be installed on all open sides of a rolling tower scaffold to prevent falls? A) Base plates B) Toeboards C) Guardrails with mid-rails D) Ladder access Answer: C Explanation: Guardrails with a top rail and mid-rail protect workers from falling off the scaffold. Question 35. The Nevada Building Code requires a minimum fire-resistance rating for a partition separating a dwelling unit from a garage. The rating is: A) 30 minutes B) 45 minutes C) 1 hour D) 2 hours
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Answer: C Explanation: A 1-hour fire-rated partition is required between habitable spaces and attached garages. Question 36. When interpreting a wall section symbol on a blueprint, the symbol “––|–|––” most likely indicates: A) A double-stud wall with insulation B) A metal lath with plaster finish C) A control joint in a stucco system D) A recessed lighting fixture Answer: C Explanation: The broken line with a vertical bar denotes a control joint used to manage cracking. Question 37. A contractor must order plaster bags based on a coverage rate of 50 sq ft per 80-lb bag for the finish coat. If the finish area is 2,400 sq ft, how many bags are required? A) 40 bags B) 48 bags C) 50 bags D) 60 bags Answer: B Explanation: 2,400 sq ft ÷ 50 sq ft per bag = 48 bags. Question 38. The term “key” in plastering refers to: A) The chemical bond between cement and lime B) The mechanical interlock created by the lath surface
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Question 41. When applying a sand-finish texture, the recommended sand size is: A) 10- 20 mesh B) 30- 40 mesh C) 50- 70 mesh D) 80- 100 mesh Answer: B Explanation: 30- 40 mesh sand provides a noticeable but not overly coarse texture for interior walls. Question 42. Which of the following is a required inspection point before applying the brown coat? A) Verification that the scratch coat is fully cured and free of cracks B) Confirmation that the wall temperature is above 70 °F C) Measurement of the exact thickness of the scratch coat using a probe D) All of the above Answer: D Explanation: All three items are critical to ensure proper adhesion and performance of the brown coat. Question 43. For a gypsum board ceiling in a high-humidity environment, the recommended board type is: A) Standard gray board B) Green moisture-resistant board C) Blue acoustic board D) Type-X fire-rated board
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Answer: B Explanation: Green moisture-resistant gypsum board is designed for humid conditions to prevent mold. Question 44. The purpose of a control joint in a plaster wall is to: A) Provide a decorative line B) Allow for differential movement and prevent uncontrolled cracking C) Increase fire resistance D) Serve as a conduit for electrical wiring Answer: B Explanation: Control joints create a deliberate weak plane where cracks can occur without damaging the overall wall. Question 45. When installing corner beads on interior plaster walls, the bead should be anchored with: A) Adhesive only B) Staples placed every 6 inches C) Thin-set mortar over the entire length D) Screws driven into the studs Answer: B Explanation: Staples at 6-inch intervals securely attach the metal corner bead before plastering. Question 46. The recommended minimum thickness for a waterproofing membrane applied behind exterior stucco is: A) 1 mil B) 5 mil
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Question 49. The primary advantage of using a lime-based finish coat in interior plaster is: A) Faster setting time B) Higher compressive strength C) Greater flexibility and crack resistance D) Lower cost Answer: C Explanation: Lime adds flexibility, reducing the likelihood of cracking in interior environments. Question 50. When installing acoustic tile on a concrete slab, the recommended adhesive is: A) Thin-set mortar B) Construction adhesive with a minimum 40 psi shear rating C) Vinyl flooring glue D) No adhesive; tiles are mechanically fastened Answer: B Explanation: A high-strength construction adhesive ensures the heavy acoustic tile remains bonded to concrete. Question 51. Which fire-proofing material is classified as “Class A” for flame spread rating? A) Gypsum board B) Cementitious fireproofing C) Mineral wool insulation D) Intumescent paint
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Answer: C Explanation: Mineral wool is a Class A material, providing superior fire resistance. Question 52. The Nevada State Fire Marshal requires fire-resistive plaster to be tested in accordance with: A) ASTM E B) ASTM C 596 C) ASTM E D) ASTM C 150 Answer: C Explanation: ASTM E119 specifies fire-resistance testing methods for building assemblies. Question 53. For a three-coat stucco system, the recommended curing time before applying the finish coat is: A) 2 hours B) 6 hours C) 12 hours D) 24 hours Answer: C Explanation: A minimum of 12 hours allows the scratch and brown coats to gain sufficient strength. Question 54. When a plaster wall is being finished in a high-temperature environment (> 85 °F), the water content in the mix should be: A) Increased by 10% B) Decreased by 10%
