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100+ Free CSLB C-9 Drywall Exam Practice Questions

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Key Facts: CSLB C-9 Drywall Exam Exam

3.5 Hours

Time Limit

CSLB

4 Years

Experience Required

CSLB

$450

Application Fee

CSLB

19%

Safety Weight

CSLB

32%

Installation & Repair Weight

CSLB

The CSLB C-9 Drywall exam is a 3.5-hour, computer-delivered test administered by PSI. It requires 4 years of journey-level experience and a $450 application fee. Topic weights include Planning and Estimating (18%), Preparation, Framing, and Layout (14%), Installation and Repair (32%), Finishing (17%), and Safety (19%).

Sample CSLB C-9 Drywall Exam Practice Questions

Try these sample questions to test your CSLB C-9 Drywall Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A contractor is estimating drywall for a commercial office room measuring 30 ft by 40 ft with a 10 ft ceiling height. Assuming 4 ft by 12 ft sheets and adding a 10% waste factor, how many drywall sheets are required for the walls and flat ceiling combined?
A.60 sheets of 4' x 12' drywall
B.72 sheets of 4' x 12' drywall
C.48 sheets of 4' x 12' drywall
D.84 sheets of 4' x 12' drywall
Explanation: GA-216 and standard C-9 estimating practices require calculating net square footage of walls and ceilings, dividing by board coverage (48 sq ft for 4x12 panels), and applying a 10% waste allowance. Total perimeter walls (1,400 sq ft) plus ceiling (1,200 sq ft) equals 2,600 sq ft, which with 10% waste equals 2,860 sq ft, requiring 60 panels.
2For a commercial drywall project covering 8,000 sq ft of wallboard, how many 5-gallon buckets of ready-mix joint compound should be estimated for a standard Level 4 finish?
A.24 five-gallon buckets of compound
B.16 five-gallon buckets of compound
C.32 five-gallon buckets of compound
D.08 five-gallon buckets of compound
Explanation: According to GA-214 and Gypsum Association estimating standards, Level 4 finishing requires approximately 9 to 10 gallons of joint compound per 1,000 square feet of panel surface. For 8,000 square feet of wallboard, 80 gallons are required, which translates to exactly 16 five-gallon buckets.
3An estimator is calculating paper joint tape requirements for a 12,000 sq ft drywall installation. How many standard 500-foot rolls of tape are required for this scope?
A.15 rolls of 500-foot paper tape
B.20 rolls of 500-foot paper tape
C.09 rolls of 500-foot paper tape
D.30 rolls of 500-foot paper tape
Explanation: ASTM C840 and Gypsum Association guidelines specify an average tape usage rate of 370 linear feet per 1,000 square feet of drywall. A total area of 12,000 square feet requires 4,440 feet of tape, which rounds up to 9 standard 500-foot rolls.
4How many 1-1/4 inch drywall screws are required to fasten 150 sheets of 4 ft by 8 ft gypsum board to wall studs spaced 16 inches on center?
A.3,200 drywall screws total
B.6,400 drywall screws total
C.2,100 drywall screws total
D.4,800 drywall screws total
Explanation: Standard drywall estimating practice assumes 12-inch screw spacing along each framing member for reliable wall fastening, averaging approximately 32 screws per 4'x8' sheet on 16-inch o.c. studs. GA-216 permits wall screw spacing up to 16 inches on center, but 12-inch spacing is standard for production estimates because it accounts for perimeter edge fastening. Multiplying 32 screws per sheet by 150 sheets yields a total requirement of 4,800 screws.
5A C-9 contractor is framing a straight 160-foot non-load-bearing partition wall with metal studs placed 16 inches on center. How many steel studs are needed, excluding corners and openings?
A.121 steel studs required
B.101 steel studs required
C.141 steel studs required
D.161 steel studs required
Explanation: The formula for calculating stud count on a single partition wall is total length in feet divided by stud spacing in feet, plus 1 starter stud. For 160 feet at 1.333 feet spacing (16" o.c.), 120 spaces plus 1 results in 121 metal studs.
6When planning a commercial project with 9-foot ceiling heights, which panel size minimizes horizontal butt joints and overall labor?
A.4 ft by 08 ft panels hung vertically only
B.5 ft by 10 ft panels hung horizontally
C.4 ft by 10 ft panels hung vertically
D.4 ft by 12 ft panels hung vertically
Explanation: GA-216 recommends installing panels horizontally whenever possible using continuous full-length panels to reduce joints. Utilizing 54-inch (4.5 ft) or 5-foot wide panels installed horizontally on 9-foot walls eliminates horizontal mid-wall butt joints, significantly decreasing finishing labor.
7A 20-foot long by 10-foot high interior acoustic partition requires resilient channels (RC-1) installed horizontally at 24 inches on center. What total linear feet of RC-1 channel is needed?
A.160 linear feet of RC-1
B.240 linear feet of RC-1
C.120 linear feet of RC-1
D.080 linear feet of RC-1
Explanation: Resilient channels installed at 24 inches on center across a 10-foot high wall require 6 horizontal runs from floor to ceiling. Multiplying 6 runs by the 20-foot wall length yields 120 linear feet of RC-1 resilient channel.
8A 2-hour fire-rated corridor partition wall measuring 100 feet long by 10 feet high requires double-layer 5/8-inch Type X gypsum board on both sides. How many 4' x 10' sheets are needed without waste?
A.025 sheets of 4' x 10' panels
B.050 sheets of 4' x 10' panels
C.075 sheets of 4' x 10' panels
D.100 sheets of 4' x 10' panels
Explanation: Under CBC Chapter 25 and GA-600 Fire Resistance Design Manual, a 2-hour fire partition with double-layer 5/8-inch Type X wallboard on both sides comprises 4 total layers of gypsum panels. A 100 ft by 10 ft wall equals 1,000 sq ft per side; four layers total 4,000 sq ft, which requires exactly 100 panels of 4' x 10' size.
9A commercial project contains 45 exterior wall corners with 9-foot ceilings. How many standard 10-foot metal corner beads must be ordered to trim all corners?
A.45 ten-foot corner beads
B.50 ten-foot corner beads
C.35 ten-foot corner beads
D.60 ten-foot corner beads
Explanation: ASTM C840 and standard drywall detailing require continuous corner bead runs for vertical exterior corners. For 9-foot ceilings, each of the 45 corners requires one 10-foot corner bead trimmed to length, requiring a minimum order of 45 pieces.
10When estimating joint compound for a Level 5 skim coat over 5,000 sq ft of wallboard, how much additional ready-mix compound is needed beyond a Level 4 finish?
A.10 to 12 additional gallons
B.35 to 40 additional gallons
C.70 to 80 additional gallons
D.15 to 20 additional gallons
Explanation: GA-214 specifies that Level 5 finish requires a continuous thin skim coat over the entire board surface to conceal porosity variations. Estimating standards add 7 to 8 gallons per 1,000 square feet for skim coating, resulting in 35 to 40 additional gallons for 5,000 square feet.

About the CSLB C-9 Drywall Exam Exam

The California C-9 Drywall Contractor exam assesses knowledge in planning, estimating, preparation, framing, installation, repair, finishing, and safety as required for drywall contracting in California.

Assessment

Question count not published by the exam provider

Time Limit

3.5 hours

Passing Score

Disclosed at test site

Exam Fee

$450 application fee (California Contractors State License Board (CSLB))

CSLB C-9 Drywall Exam Exam Content Outline

18%

Planning and Estimating

Evaluating plans and specifications, estimating materials, and calculating project costs.

14%

Preparation, Framing, and Layout

Site preparation, layout tasks, and metal or wood framing requirements.

32%

Installation and Repair

Installing drywall, lath, suspended ceilings, and repairing existing drywall structures.

17%

Finishing

Taping, texturing, applying joint compound, and achieving specific levels of finish.

19%

Safety

Cal/OSHA regulations, scaffold safety, fall protection, and handling hazardous materials.

How to Pass the CSLB C-9 Drywall Exam Exam

What You Need to Know

  • Passing score: Disclosed at test site
  • Assessment: Question count not published by the exam provider
  • Time limit: 3.5 hours
  • Exam fee: $450 application fee

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CSLB C-9 Drywall Exam Study Tips from Top Performers

1Review the GA-216 manual for application and finishing of gypsum panel products.
2Understand the five levels of drywall finish and when to use each.
3Familiarize yourself with Cal/OSHA safety requirements, especially for scaffolds and respirators.
4Practice reading blueprints and performing material take-offs accurately.
5Memorize the fastener spacing requirements for different drywall assemblies.

Frequently Asked Questions

How long is the CSLB C-9 exam?

The exam is a computer-delivered multiple-choice test with a time limit of 3.5 hours (210 minutes).

What is the experience requirement for the C-9 license?

Applicants must have at least 4 years of qualifying journey-level experience in the drywall trade within the past 10 years.

How much does it cost to apply?

The application fee for the CSLB examination is $450.

Where can I take the exam?

Exams are administered by PSI at various computer testing centers throughout California.