Nevada C-3 Carpentry Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which type of lumber is most commonly used for framing residential
structures in Nevada?
A. Ponderosa Pine
B. Red Oak
C. Douglas Fir
D. Teak
Rationale: Douglas Fir is commonly used for residential framing due to its
strength, straight grain, and availability in construction-grade dimensions.
2. What is the minimum allowable spacing for 2x6 floor joists supporting
a residential floor with a span of 10 feet?
A. 12 inches on center
B. 16 inches on center
C. 18 inches on center
D. 24 inches on center
Rationale: Building codes typically require 2x6 joists to be spaced 16 inches
on center for residential floors to ensure adequate load distribution and
structural integrity.
3. When installing exterior plywood sheathing, which method provides
the best allowance for wood expansion and contraction?
A. Tight fit against edges
B. 1/8 inch gap between panels
, C. Overlap edges by 1/4 inch
D. Nail continuously along the edges
Rationale: Leaving a 1/8 inch gap between panels allows for seasonal
expansion and contraction, preventing buckling or warping.
4. What type of fastener is recommended for securing treated lumber to
avoid corrosion?
A. Standard steel nails
B. Hot-dipped galvanized nails or screws
C. Aluminum nails
D. Brass nails
Rationale: Treated lumber contains chemicals that can corrode standard
steel; hot-dipped galvanized fasteners resist corrosion and ensure long-
term structural integrity.
5. In stair construction, what is the maximum rise for a residential step in
Nevada?
A. 7 inches
B. 7 1/2 inches
C. 7 3/4 inches
D. 8 inches
Rationale: Building codes allow a maximum rise of 7 3/4 inches for
residential stairs to maintain safety and comfortable use.
6. Which type of wood joint is typically used to join two pieces of wood
at a 90-degree angle for cabinetry?
A. Dado joint
B. Lap joint
C. Miter joint
D. Tongue-and-groove joint
Rationale: A miter joint is commonly used for corners in cabinetry and trim,
providing a clean appearance and ease of assembly.
, 7. What is the purpose of installing a sill gasket between the foundation
and sill plate?
A. Aesthetic finish
B. Fire protection
C. Moisture and air barrier
D. Termite protection
Rationale: A sill gasket prevents moisture and air infiltration from the
foundation, improving energy efficiency and preventing wood rot.
8. What type of adhesive is most suitable for bonding exterior-grade
plywood panels?
A. White PVA glue
B. Epoxy resin
C. Contact cement
D. Phenol-resorcinol or exterior wood glue
Rationale: Phenol-resorcinol or exterior-grade wood glue provides durable,
waterproof bonding suitable for exterior plywood sheathing.
9. When constructing a flat roof, which type of lumber is typically used
for rafters?
A. 2x4
B. 2x6
C. 2x8 or larger depending on span
D. 1x8
Rationale: Rafters for flat roofs require larger dimensional lumber, like 2x8
or larger, to support live and dead loads and maintain structural stability.
10. Which method is most appropriate for preventing wood framing
from warping due to moisture?
A. Painting the lumber only
B. Storing lumber off the ground and covering it
C. Leaving lumber exposed to air
D. Using untreated wood indoors
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which type of lumber is most commonly used for framing residential
structures in Nevada?
A. Ponderosa Pine
B. Red Oak
C. Douglas Fir
D. Teak
Rationale: Douglas Fir is commonly used for residential framing due to its
strength, straight grain, and availability in construction-grade dimensions.
2. What is the minimum allowable spacing for 2x6 floor joists supporting
a residential floor with a span of 10 feet?
A. 12 inches on center
B. 16 inches on center
C. 18 inches on center
D. 24 inches on center
Rationale: Building codes typically require 2x6 joists to be spaced 16 inches
on center for residential floors to ensure adequate load distribution and
structural integrity.
3. When installing exterior plywood sheathing, which method provides
the best allowance for wood expansion and contraction?
A. Tight fit against edges
B. 1/8 inch gap between panels
, C. Overlap edges by 1/4 inch
D. Nail continuously along the edges
Rationale: Leaving a 1/8 inch gap between panels allows for seasonal
expansion and contraction, preventing buckling or warping.
4. What type of fastener is recommended for securing treated lumber to
avoid corrosion?
A. Standard steel nails
B. Hot-dipped galvanized nails or screws
C. Aluminum nails
D. Brass nails
Rationale: Treated lumber contains chemicals that can corrode standard
steel; hot-dipped galvanized fasteners resist corrosion and ensure long-
term structural integrity.
5. In stair construction, what is the maximum rise for a residential step in
Nevada?
A. 7 inches
B. 7 1/2 inches
C. 7 3/4 inches
D. 8 inches
Rationale: Building codes allow a maximum rise of 7 3/4 inches for
residential stairs to maintain safety and comfortable use.
6. Which type of wood joint is typically used to join two pieces of wood
at a 90-degree angle for cabinetry?
A. Dado joint
B. Lap joint
C. Miter joint
D. Tongue-and-groove joint
Rationale: A miter joint is commonly used for corners in cabinetry and trim,
providing a clean appearance and ease of assembly.
, 7. What is the purpose of installing a sill gasket between the foundation
and sill plate?
A. Aesthetic finish
B. Fire protection
C. Moisture and air barrier
D. Termite protection
Rationale: A sill gasket prevents moisture and air infiltration from the
foundation, improving energy efficiency and preventing wood rot.
8. What type of adhesive is most suitable for bonding exterior-grade
plywood panels?
A. White PVA glue
B. Epoxy resin
C. Contact cement
D. Phenol-resorcinol or exterior wood glue
Rationale: Phenol-resorcinol or exterior-grade wood glue provides durable,
waterproof bonding suitable for exterior plywood sheathing.
9. When constructing a flat roof, which type of lumber is typically used
for rafters?
A. 2x4
B. 2x6
C. 2x8 or larger depending on span
D. 1x8
Rationale: Rafters for flat roofs require larger dimensional lumber, like 2x8
or larger, to support live and dead loads and maintain structural stability.
10. Which method is most appropriate for preventing wood framing
from warping due to moisture?
A. Painting the lumber only
B. Storing lumber off the ground and covering it
C. Leaving lumber exposed to air
D. Using untreated wood indoors
