CA C09 DRYWALL ENGLISH EXAM ADVANCED ACTUAL
EXAM QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES GRADED A+ LATEST
,CA C09 Drywall English Exam (2025–2026)
1. A contractor is preparing to hang 5/8-inch Type X gypsum board on a commercial ceiling
requiring a 1-hour fire-resistance rating. Which action best ensures compliance with fire code
requirements?
A. Install 1/2-inch regular board with wider screw spacing
B. Use 5/8-inch Type X board per listed assembly and follow manufacturer fastening schedule
C. Apply additional joint compound layers
D. Use moisture-resistant board instead of Type X
Correct ANSWER: B Rationale: Fire-resistance ratings are based on tested assemblies.
Compliance requires installing the specified Type X board and fastening pattern according to the
listed fire-rated design.
2. When fastening gypsum board to wood studs on walls, what is the maximum typical spacing
for screws in the field of the board?
A. 24 inches
B. 16 inches
C. 12 inches
D. 8 inches
Correct ANSWER: B Rationale: Standard practice for wall applications is screws spaced
approximately 16 inches on center in the field to ensure proper support and prevent movement.
3. A drywall finisher notices blistering tape joints after drying. The most likely cause is:
A. Excessive sanding
B. Insufficient joint compound beneath the tape
C. Overdriven fasteners
D. High room temperature
Correct ANSWER: B Rationale: Blistering commonly occurs when inadequate compound is
applied under tape, preventing proper adhesion.
,4. In a high-humidity bathroom installation, which board type is most appropriate?
A. Regular gypsum board
B. Type X board only
C. Moisture-resistant gypsum board
D. Exterior sheathing board
Correct ANSWER: C Rationale: Moisture-resistant board is designed to resist humidity
exposure in areas such as bathrooms.
5. A wall shows nail pops several weeks after installation. The primary cause is:
A. Improper sanding technique
B. Stud shrinkage or fastener placement issues
C. Excess primer
D. Incorrect tape type
Correct ANSWER: B Rationale: Nail pops typically result from wood framing shrinkage or
improperly secured fasteners that loosen over time.
6. For Level 5 finish requirements, what additional step is necessary beyond Level 4?
A. Double-layer taping
B. Skim coating entire surface
C. Texturing the surface
D. Using fiberglass tape only
Correct ANSWER: B Rationale: A Level 5 finish includes a thin skim coat over the entire
surface to achieve uniform texture and appearance.
7. When installing drywall on metal studs, screws should:
A. Penetrate at least 3/4 inch into framing
B. Be longer than wood screws by 1 inch
C. Be fine-threaded and penetrate through the metal stud
D. Be spaced at 30 inches
Correct ANSWER: C Rationale: Fine-thread drywall screws are designed to penetrate and
secure properly into metal studs.
, 8. A contractor must reduce sound transmission between units in a multifamily building. Which
method is most effective?
A. Use thinner gypsum board
B. Install resilient channel or sound isolation clips
C. Increase screw spacing
D. Apply extra primer
Correct ANSWER: B Rationale: Resilient channels or isolation clips decouple drywall from
framing, reducing sound transmission.
9. When cutting gypsum board to fit around an electrical box, the best tool is:
A. Circular saw
B. Utility knife and keyhole saw
C. Framing hammer
D. Metal snips
Correct ANSWER: B Rationale: A utility knife scores the board, and a keyhole saw allows
precise cutouts for openings.
10. A ceiling shows sagging between joists. The most likely cause is:
A. Over-sanding joints
B. Excess paint application
C. Improper board thickness or excessive spacing of framing members
D. Too many fasteners
Correct ANSWER: C Rationale: Sagging ceilings often result from using board too thin for the
span or framing spaced too far apart.
11. Expansion joints are required when:
A. Walls exceed recommended continuous lengths
B. Using fiberglass tape
C. Applying texture finishes
D. Installing moisture-resistant board
Correct ANSWER: A Rationale: Expansion joints accommodate structural movement in long
wall or ceiling runs.
EXAM QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES GRADED A+ LATEST
,CA C09 Drywall English Exam (2025–2026)
1. A contractor is preparing to hang 5/8-inch Type X gypsum board on a commercial ceiling
requiring a 1-hour fire-resistance rating. Which action best ensures compliance with fire code
requirements?
A. Install 1/2-inch regular board with wider screw spacing
B. Use 5/8-inch Type X board per listed assembly and follow manufacturer fastening schedule
C. Apply additional joint compound layers
D. Use moisture-resistant board instead of Type X
Correct ANSWER: B Rationale: Fire-resistance ratings are based on tested assemblies.
Compliance requires installing the specified Type X board and fastening pattern according to the
listed fire-rated design.
2. When fastening gypsum board to wood studs on walls, what is the maximum typical spacing
for screws in the field of the board?
A. 24 inches
B. 16 inches
C. 12 inches
D. 8 inches
Correct ANSWER: B Rationale: Standard practice for wall applications is screws spaced
approximately 16 inches on center in the field to ensure proper support and prevent movement.
3. A drywall finisher notices blistering tape joints after drying. The most likely cause is:
A. Excessive sanding
B. Insufficient joint compound beneath the tape
C. Overdriven fasteners
D. High room temperature
Correct ANSWER: B Rationale: Blistering commonly occurs when inadequate compound is
applied under tape, preventing proper adhesion.
,4. In a high-humidity bathroom installation, which board type is most appropriate?
A. Regular gypsum board
B. Type X board only
C. Moisture-resistant gypsum board
D. Exterior sheathing board
Correct ANSWER: C Rationale: Moisture-resistant board is designed to resist humidity
exposure in areas such as bathrooms.
5. A wall shows nail pops several weeks after installation. The primary cause is:
A. Improper sanding technique
B. Stud shrinkage or fastener placement issues
C. Excess primer
D. Incorrect tape type
Correct ANSWER: B Rationale: Nail pops typically result from wood framing shrinkage or
improperly secured fasteners that loosen over time.
6. For Level 5 finish requirements, what additional step is necessary beyond Level 4?
A. Double-layer taping
B. Skim coating entire surface
C. Texturing the surface
D. Using fiberglass tape only
Correct ANSWER: B Rationale: A Level 5 finish includes a thin skim coat over the entire
surface to achieve uniform texture and appearance.
7. When installing drywall on metal studs, screws should:
A. Penetrate at least 3/4 inch into framing
B. Be longer than wood screws by 1 inch
C. Be fine-threaded and penetrate through the metal stud
D. Be spaced at 30 inches
Correct ANSWER: C Rationale: Fine-thread drywall screws are designed to penetrate and
secure properly into metal studs.
, 8. A contractor must reduce sound transmission between units in a multifamily building. Which
method is most effective?
A. Use thinner gypsum board
B. Install resilient channel or sound isolation clips
C. Increase screw spacing
D. Apply extra primer
Correct ANSWER: B Rationale: Resilient channels or isolation clips decouple drywall from
framing, reducing sound transmission.
9. When cutting gypsum board to fit around an electrical box, the best tool is:
A. Circular saw
B. Utility knife and keyhole saw
C. Framing hammer
D. Metal snips
Correct ANSWER: B Rationale: A utility knife scores the board, and a keyhole saw allows
precise cutouts for openings.
10. A ceiling shows sagging between joists. The most likely cause is:
A. Over-sanding joints
B. Excess paint application
C. Improper board thickness or excessive spacing of framing members
D. Too many fasteners
Correct ANSWER: C Rationale: Sagging ceilings often result from using board too thin for the
span or framing spaced too far apart.
11. Expansion joints are required when:
A. Walls exceed recommended continuous lengths
B. Using fiberglass tape
C. Applying texture finishes
D. Installing moisture-resistant board
Correct ANSWER: A Rationale: Expansion joints accommodate structural movement in long
wall or ceiling runs.
