CO Framing Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is the most common type of wood used for
structural framing in residential construction?
A. Oak
B. Pine
C. Cedar
D. Douglas Fir
Douglas Fir is commonly used because of its strength, workability,
and availability.
2. What is the standard spacing for floor joists in residential construction?
A. 12 inches
B. 16 inches
C. 24 inches
D. 36 inches
16 inches on center is the standard to provide adequate support and
reduce deflection.
3. Which tool is primarily used to measure and mark a 90-degree angle in
framing?
A. Tape measure
B. Spirit level
C. Carpenter’s square
D. Chalk line
A carpenter’s square ensures precise right-angle markings for
framing joints.
4. What type of nail is typically used for fastening 2x4 lumber in wall
framing?
, A. Finish nail
B. Common nail
C. Brad nail
D. Roofing nail
Common nails provide the necessary holding power for structural
framing.
5. What is the main purpose of a sill plate in wood framing?
A. To support the roof
B. To anchor the walls to the foundation
C. To provide insulation
D. To act as a vapor barrier
The sill plate sits on the foundation and secures the wall framing to
the structure.
6. When installing headers over door and window openings, what must be
considered?
A. Color of the wood
B. Type of paint used
C. Load-bearing requirements
D. Placement of insulation
Headers must be sized to carry the load from above openings safely.
7. Which framing method uses pre-cut and assembled wall panels?
A. Balloon framing
B. Platform framing
C. Panelized framing
D. Timber framing
Panelized framing speeds up construction by using factory-built wall
panels.
8. In platform framing, which component is built first?
A. Roof trusses
B. Upper floor
C. Floor platform
D. Exterior walls
The floor platform provides the base for walls and the next floor
level.
9. What is the purpose of a cripple stud?
A. To support the roof
B. To hold the floor joists
, C. To fill the space between a header and top/bottom plate
D. To anchor the wall to the foundation
Cripple studs are short studs used above or below openings to
transfer loads to structural elements.
10. Which type of lumber defect weakens the structural integrity of
framing?
A. Dryness
B. Smooth surface
C. Knots
D. Light color
Knots can create weak points that reduce the strength of the lumber.
11. What is the minimum fire-resistant framing material for exterior
walls in many residential codes?
A. Pine
B. Cedar
C. Pressure-treated plywood
D. Fire-retardant-treated lumber
Fire-retardant-treated lumber is required to reduce fire spread in
exterior walls.
12. Which of the following tools is used to check a wall for vertical
alignment?
A. Carpenter’s square
B. Tape measure
C. Spirit level
D. Chalk line
A spirit level ensures that walls are perfectly plumb.
13. What spacing is standard for roof rafters in typical residential
construction?
A. 12 inches
B. 16 or 24 inches
C. 30 inches
D. 36 inches
Rafters are commonly spaced 16 or 24 inches on center, depending
on load and design.
14. Which type of joint is commonly used at the corners of wood
framing?
A. Butt joint
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is the most common type of wood used for
structural framing in residential construction?
A. Oak
B. Pine
C. Cedar
D. Douglas Fir
Douglas Fir is commonly used because of its strength, workability,
and availability.
2. What is the standard spacing for floor joists in residential construction?
A. 12 inches
B. 16 inches
C. 24 inches
D. 36 inches
16 inches on center is the standard to provide adequate support and
reduce deflection.
3. Which tool is primarily used to measure and mark a 90-degree angle in
framing?
A. Tape measure
B. Spirit level
C. Carpenter’s square
D. Chalk line
A carpenter’s square ensures precise right-angle markings for
framing joints.
4. What type of nail is typically used for fastening 2x4 lumber in wall
framing?
, A. Finish nail
B. Common nail
C. Brad nail
D. Roofing nail
Common nails provide the necessary holding power for structural
framing.
5. What is the main purpose of a sill plate in wood framing?
A. To support the roof
B. To anchor the walls to the foundation
C. To provide insulation
D. To act as a vapor barrier
The sill plate sits on the foundation and secures the wall framing to
the structure.
6. When installing headers over door and window openings, what must be
considered?
A. Color of the wood
B. Type of paint used
C. Load-bearing requirements
D. Placement of insulation
Headers must be sized to carry the load from above openings safely.
7. Which framing method uses pre-cut and assembled wall panels?
A. Balloon framing
B. Platform framing
C. Panelized framing
D. Timber framing
Panelized framing speeds up construction by using factory-built wall
panels.
8. In platform framing, which component is built first?
A. Roof trusses
B. Upper floor
C. Floor platform
D. Exterior walls
The floor platform provides the base for walls and the next floor
level.
9. What is the purpose of a cripple stud?
A. To support the roof
B. To hold the floor joists
, C. To fill the space between a header and top/bottom plate
D. To anchor the wall to the foundation
Cripple studs are short studs used above or below openings to
transfer loads to structural elements.
10. Which type of lumber defect weakens the structural integrity of
framing?
A. Dryness
B. Smooth surface
C. Knots
D. Light color
Knots can create weak points that reduce the strength of the lumber.
11. What is the minimum fire-resistant framing material for exterior
walls in many residential codes?
A. Pine
B. Cedar
C. Pressure-treated plywood
D. Fire-retardant-treated lumber
Fire-retardant-treated lumber is required to reduce fire spread in
exterior walls.
12. Which of the following tools is used to check a wall for vertical
alignment?
A. Carpenter’s square
B. Tape measure
C. Spirit level
D. Chalk line
A spirit level ensures that walls are perfectly plumb.
13. What spacing is standard for roof rafters in typical residential
construction?
A. 12 inches
B. 16 or 24 inches
C. 30 inches
D. 36 inches
Rafters are commonly spaced 16 or 24 inches on center, depending
on load and design.
14. Which type of joint is commonly used at the corners of wood
framing?
A. Butt joint
