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2026 Statistics
Key Facts: CSLB C-23 Exam
3.5
Hours
CSLB
4
Years Experience
CSLB
$450
Application Fee
CSLB
5
Exam Sections
CSLB
22%
Safety Weight
CSLB
The CSLB C-23 Ornamental Metal exam is a 3.5-hour, computer-based test administered by PSI. It requires 4 years of journey-level experience, a $450 application fee, and tests across five main domains.
Sample CSLB C-23 Practice Questions
Try these sample questions to test your CSLB C-23 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 the total weight for a decorative fence requiring 40 solid steel bars, each 1/2 inch square and 5 feet long. Given that steel weighs approximately 0.85 lbs per linear foot for 1/2-inch solid square stock, what is the total weight of the bar stock before accounting for waste?
A.A total weight of 170.0 pounds
B.A total weight of 145.0 pounds
C.A total weight of 210.0 pounds
D.A total weight of 255.0 pounds
Explanation: Calculating total weight requires multiplying the total linear footage by the weight per linear foot. 40 bars multiplied by 5 feet equals 200 linear feet of bar stock. Multiplying 200 feet by 0.85 lbs/ft yields exactly 170.0 pounds of steel.
2An estimator is laying out a guard railing with a clear opening length of 140 inches between end posts. If the decorative pickets are 1/2 inch square solid steel bars, what is the MINIMUM number of pickets required to ensure no opening allows passage of a 4-inch sphere as required by the building code?
A.Exactly 28 decorative pickets
B.Exactly 34 decorative pickets
C.Exactly 31 decorative pickets
D.Exactly 38 decorative pickets
Explanation: The building code requires that openings in guardrails must not allow passage of a 4-inch sphere, meaning the maximum clear space between pickets is 4.0 inches. For a run length of 140 inches with pickets 0.5 inches wide, the equation (140 - 0.5N) / (N + 1) <= 4.0 yields N >= 30.22. Since partial pickets are not possible, a minimum of 31 pickets is required to satisfy the 4-inch sphere rule.
3A custom ornamental metal staircase has a total rise of 108 inches and a total run of 144 inches. What is the slope angle (pitch) of the stair stringer to the nearest degree?
A.A slope angle of 31 degrees
B.A slope angle of 37 degrees
C.A slope angle of 43 degrees
D.A slope angle of 48 degrees
Explanation: The stair pitch angle is determined using the tangent trigonometric function where tan(angle) = Rise / Run. Dividing 108 inches by 144 inches gives 0.75, and arctan(0.75) equals approximately 36.87 degrees, which rounds to 37 degrees.
4An estimator is ordering structural steel tubing (HSS 2" x 2" x 3/16") for a commercial guardrail job requiring 120 linear feet. If HSS 2x2x3/16 steel tube weighs 4.32 lbs per foot, what total weight should be budgeted including a 10% scrap/waste factor?
A.A total weight of 466 lbs
B.A total weight of 518 lbs
C.A total weight of 622 lbs
D.A total weight of 570 lbs
Explanation: First calculate the base material weight: 120 feet multiplied by 4.32 lbs/ft equals 518.4 lbs. Adding a 10% scrap and waste allowance (518.4 * 1.10) results in 570.24 lbs, which rounds to 570 lbs.
5On an architectural shop drawing for a decorative canopy, a weld symbol shows a triangular fillet weld symbol located BELOW the reference line. According to AWS A2.4 standard welding symbols, where must this weld be performed?
A.On the far side of the joint
B.All around the joint perimeter
C.In the field during final assembly
D.On the arrow side of the joint
Explanation: AWS A2.4 standardizes welding symbol placement on shop drawings. Symbols placed below the reference line indicate welds to be executed on the arrow side of the joint, whereas symbols placed above the line specify welds on the other side.
6A contractor is estimating a 200-foot continuous exterior aluminum handrail installation. If the ambient temperature varies by 80°F over the year and aluminum has a thermal expansion coefficient of 12.8 x 10^-6 in/in/°F, what total linear thermal expansion must be accommodated across the entire rail length?
A.Approximately 1.23 inches
B.Approximately 2.46 inches
C.Approximately 3.69 inches
D.Approximately 4.92 inches
Explanation: Thermal expansion is calculated using the formula Delta L = L * Delta T * alpha. Converting 200 feet to inches yields 2,400 inches. Multiplying 2,400 in * 80°F * 0.0000128 in/in/°F results in 2.4576 inches (approximately 2.46 inches), which must be accommodated with expansion joints.
7According to the California Building Code, what minimum concentrated load applied in any direction at the top rail must a commercial guardrail system be designed to resist?
A.A concentrated load of 200 pounds
B.A concentrated load of 150 pounds
C.A concentrated load of 250 pounds
D.A concentrated load of 300 pounds
Explanation: The building code requires guardrail top rails and handrails to resist a minimum concentrated load of 200 pounds applied in any direction at any point along the top rail. This 200-pound force simulates a person leaning or falling against the rail and must be transferred safely through the posts into the structure. The concentrated load is analyzed separately from any uniform load requirement, and both conditions must be satisfied independently.
8According to CBC Chapter 16, what minimum uniform load applied horizontally along the top rail must be included in structural calculations for a commercial guardrail system?
A.A uniform load of 25 PLF
B.A uniform load of 35 PLF
C.A uniform load of 50 PLF
D.A uniform load of 75 PLF
Explanation: The building code requires handrails and guardrails in commercial occupancies to withstand a minimum uniform design load of 50 pounds per linear foot (PLF) applied horizontally. This uniform load represents crowd pressure along a railing and is analyzed independently from the concentrated 200-pound load. Both load conditions must be satisfied in the rail design, with the more severe case governing the post and anchorage sizing.
9An ornamental metal fabricator is bidding on brass/bronze decorative entrance plaques. Bronze (C36000) weighs approximately 0.307 lbs per cubic inch. What is the total weight of a 1/2-inch thick bronze plate measuring 24 inches by 36 inches?
A.A total weight of 105.4 lbs
B.A total weight of 132.6 lbs
C.A total weight of 158.8 lbs
D.A total weight of 184.2 lbs
Explanation: First calculate the plate volume: 24 in * 36 in * 0.5 in = 432 cubic inches. Multiplying volume by bronze density (432 cu in * 0.307 lbs/cu in) yields 132.624 lbs, which rounds to 132.6 lbs.
10According to National Ornamental & Miscellaneous Metals Association (NOMMA) Voluntary Joint Standards, which finish designation refers to a commercially smooth finish with welds ground smooth and flush?
A.NOMMA Finish Class 1
B.NOMMA Finish Class 3
C.NOMMA Finish Class 4
D.NOMMA Finish Class 2
Explanation: NOMMA Finish Class 1 is the highest architectural standard, requiring welds to be ground completely smooth and flush with adjacent surfaces. No visible pits, tool marks, or weld remnants may remain before painting or plating. This finish is typically specified for prominent ornamental work where surface perfection is critical to the final appearance.
About the CSLB C-23 Exam
The C-23 Ornamental Metal examination evaluates a candidate's knowledge of planning, estimating, fabricating, installing, and repairing ornamental metal products in compliance with California codes.
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-23 Exam Content Outline
23%
Planning and Estimating
Evaluating blueprints, specifications, and estimating material, labor, and equipment costs.
21%
Fabrication
Cutting, bending, welding, and assembling ornamental metal products.
20%
Installation
Installing ornamental metal works on site in compliance with building codes.
14%
Finishes and Repairs
Applying finishes like powder coating, painting, galvanizing, and performing metal repairs.
22%
Safety
Cal/OSHA safety regulations, hazardous materials, and safe work practices.
How to Pass the CSLB C-23 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-23 Study Tips from Top Performers
1Review the California Building Code (CBC) sections relevant to handrails and guardrails.
2Understand standard welding symbols and basic metallurgy principles.
3Familiarize yourself with Cal/OSHA safety standards, especially Title 8 regulations on welding and cutting.
4Practice taking material takeoffs from sample blueprints to improve estimating skills.
5Study different types of metal finishes and the proper surface preparation required for each.
Frequently Asked Questions
How long is the CSLB C-23 exam?
The examination is 3.5 hours long and is administered on a computer at PSI testing centers.
What is the experience requirement?
You need 4 years of qualifying journey-level experience within the preceding 10 years.