Colorado Drywall Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the standard thickness of gypsum wallboard for interior walls
in residential construction?
A. 3/8 inch
B. 1/2 inch
C. 5/8 inch
D. 1 inch
B. 1/2 inch
Rationale: 1/2 inch gypsum board is standard for most interior walls in
residential buildings due to its balance of strength and ease of
installation.
2. Which type of drywall is typically used in areas with high moisture,
such as bathrooms?
A. Regular drywall
B. Green board
C. Type X
D. Fire-rated drywall
B. Green board
Rationale: Green board is moisture-resistant and is commonly used in
areas with higher humidity, though it is not fully waterproof.
3. Type X drywall is primarily used for:
A. Soundproofing
B. Moisture resistance
C. Fire resistance
D. Exterior siding
, C. Fire resistance
Rationale: Type X drywall contains additives that increase fire
resistance and is required by building codes in certain assemblies.
4. What is the purpose of corner beads in drywall installation?
A. To provide soundproofing
B. To protect and create a clean edge at corners
C. To attach drywall to framing
D. To reinforce joints
B. To protect and create a clean edge at corners
Rationale: Metal or plastic corner beads protect corners from damage
and ensure straight, clean edges for finishing.
5. When hanging drywall sheets horizontally, the end joints should be:
A. Staggered
B. Aligned
C. All on one stud
D. Against the ceiling
A. Staggered
Rationale: Staggering joints increases wall strength and reduces the
likelihood of cracks forming along seams.
6. The proper screw spacing for attaching 1/2 inch drywall to wood studs
is:
A. 12 inches
B. 16 inches
C. 24 inches
D. 8 inches
B. 16 inches
Rationale: Screws are typically spaced 16 inches apart on studs for 1/2
inch drywall to ensure secure attachment without damaging the board.
7. Joint compound is primarily used for:
A. Painting walls
B. Filling and finishing seams and nail/screw holes
C. Securing drywall to framing
D. Fireproofing
B. Filling and finishing seams and nail/screw holes
Rationale: Joint compound smooths seams and fastener heads to
prepare walls for painting or texturing.
, 8. Which drywall installation technique reduces the likelihood of nail
pops?
A. Using adhesive along with fasteners
B. Only nailing at the edges
C. Overdriving nails
D. Using green board
A. Using adhesive along with fasteners
Rationale: Applying drywall adhesive to studs in addition to screws or
nails increases holding strength and reduces nail/screw pops over time.
9. Which tool is used to cut drywall?
A. Circular saw
B. Utility knife
C. Jigsaw
D. Table saw
B. Utility knife
Rationale: A utility knife scored along a straightedge and snapped
cleanly is the standard method for cutting drywall safely.
10. How much gap should be left between the bottom edge of the
drywall and the floor?
A. No gap
B. 1/4 inch
C. 1/2 inch
D. 1 inch
B. 1/4 inch
Rationale: A small gap prevents moisture wicking from the floor into
the drywall and allows for slight floor irregularities.
11. Which type of drywall is designed for enhanced soundproofing?
A. Type X
B. Green board
C. Soundboard or acoustic drywall
D. Standard 1/2 inch drywall
C. Soundboard or acoustic drywall
Rationale: Acoustic drywall contains additional layers or materials to
reduce sound transmission through walls and ceilings.
12. What is the recommended method for finishing inside corners?
A. Corner bead
B. Folded joint tape with joint compound
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the standard thickness of gypsum wallboard for interior walls
in residential construction?
A. 3/8 inch
B. 1/2 inch
C. 5/8 inch
D. 1 inch
B. 1/2 inch
Rationale: 1/2 inch gypsum board is standard for most interior walls in
residential buildings due to its balance of strength and ease of
installation.
2. Which type of drywall is typically used in areas with high moisture,
such as bathrooms?
A. Regular drywall
B. Green board
C. Type X
D. Fire-rated drywall
B. Green board
Rationale: Green board is moisture-resistant and is commonly used in
areas with higher humidity, though it is not fully waterproof.
3. Type X drywall is primarily used for:
A. Soundproofing
B. Moisture resistance
C. Fire resistance
D. Exterior siding
, C. Fire resistance
Rationale: Type X drywall contains additives that increase fire
resistance and is required by building codes in certain assemblies.
4. What is the purpose of corner beads in drywall installation?
A. To provide soundproofing
B. To protect and create a clean edge at corners
C. To attach drywall to framing
D. To reinforce joints
B. To protect and create a clean edge at corners
Rationale: Metal or plastic corner beads protect corners from damage
and ensure straight, clean edges for finishing.
5. When hanging drywall sheets horizontally, the end joints should be:
A. Staggered
B. Aligned
C. All on one stud
D. Against the ceiling
A. Staggered
Rationale: Staggering joints increases wall strength and reduces the
likelihood of cracks forming along seams.
6. The proper screw spacing for attaching 1/2 inch drywall to wood studs
is:
A. 12 inches
B. 16 inches
C. 24 inches
D. 8 inches
B. 16 inches
Rationale: Screws are typically spaced 16 inches apart on studs for 1/2
inch drywall to ensure secure attachment without damaging the board.
7. Joint compound is primarily used for:
A. Painting walls
B. Filling and finishing seams and nail/screw holes
C. Securing drywall to framing
D. Fireproofing
B. Filling and finishing seams and nail/screw holes
Rationale: Joint compound smooths seams and fastener heads to
prepare walls for painting or texturing.
, 8. Which drywall installation technique reduces the likelihood of nail
pops?
A. Using adhesive along with fasteners
B. Only nailing at the edges
C. Overdriving nails
D. Using green board
A. Using adhesive along with fasteners
Rationale: Applying drywall adhesive to studs in addition to screws or
nails increases holding strength and reduces nail/screw pops over time.
9. Which tool is used to cut drywall?
A. Circular saw
B. Utility knife
C. Jigsaw
D. Table saw
B. Utility knife
Rationale: A utility knife scored along a straightedge and snapped
cleanly is the standard method for cutting drywall safely.
10. How much gap should be left between the bottom edge of the
drywall and the floor?
A. No gap
B. 1/4 inch
C. 1/2 inch
D. 1 inch
B. 1/4 inch
Rationale: A small gap prevents moisture wicking from the floor into
the drywall and allows for slight floor irregularities.
11. Which type of drywall is designed for enhanced soundproofing?
A. Type X
B. Green board
C. Soundboard or acoustic drywall
D. Standard 1/2 inch drywall
C. Soundboard or acoustic drywall
Rationale: Acoustic drywall contains additional layers or materials to
reduce sound transmission through walls and ceilings.
12. What is the recommended method for finishing inside corners?
A. Corner bead
B. Folded joint tape with joint compound
