CA C43 Sheet Metal Contractor Exam

CA C43 Sheet Metal Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the minimum gauge of galvanized steel recommended for

residential roofing applications?

• 28
• 26
• 24
• 22

24-gauge steel is commonly used for residential roofing because it balances durability and workability.

• Which tool is essential for cutting sheet metal accurately?
• Hammer
• Chisel
• Tin snips
• Crowbar

Tin snips are designed specifically to cut sheet metal with precision.

• What is the primary purpose of flashing in sheet metal installation?
• Decoration
• Insulation
• Waterproofing joints and seams
• Reducing noise

Flashing directs water away from joints to prevent leaks.

• What type of joint is commonly used to connect two pieces of sheet

metal at a right angle?

• Butt joint
• Seam joint 1 / 3

• Tongue-and-groove
• Dovetail joint

Seam joints are folded or crimped to create a strong and weatherproof connection.

• When installing ductwork, what is the recommended clearance from

combustibles?

• 1 inch
• 2 inches
• 6 inches
• 12 inches

A 6-inch clearance prevents heat transfer from ducts to combustible materials.

• What is the function of a crimping tool in sheet metal work?
• Cutting
• Joining edges
• Bending
• Polishing

Crimping tools fold edges together to secure joints without fasteners.

• What is the most common alloy used in commercial sheet metal

fabrication?

• Copper
• Lead
• Aluminum
• Titanium

Aluminum is lightweight, corrosion-resistant, and easy to work with, making it ideal for commercial applications.

• Which sheet metal forming process uses a punch and die to cut shapes?
• Rolling
• Bending
• Welding
• Stamping

Stamping shapes metal by pressing it with a punch into a die.

• What is the maximum allowable leakage for low-pressure ductwork

according to most codes?

• 1%
• 3%

C. 5% 2 / 3

D. 10%

Low-pressure duct systems are typically allowed up to 5% leakage of total air volume.

• What type of solder is commonly used in HVAC copper tubing

connections?

• Lead-tin solder
• Silver-bearing solder
• Epoxy
• Zinc solder

Silver-bearing solder withstands high temperatures and provides a strong, leak-proof joint.

• Which protective coating is commonly applied to prevent

corrosion in sheet metal exposed to the elements?

• Wax
• Paint only
• Galvanization
• Plastic wrap

Galvanizing applies a zinc coating that prevents rust on steel sheets.

• What is the recommended pitch for a metal roof to ensure proper

drainage?

A. 1:12

B. 2:12

C. 3:12

D. 4:12 or greater

A 4:12 slope ensures water drains quickly, reducing leakage risk.

• Which type of metal seam is preferred for standing seam roofing?
• Butt seam
• Lap seam
• Folded seam
• Mortise seam

Folded seams provide weatherproofing and allow thermal expansion.

• When fabricating ducts, what is the standard method to join two

sections?

• Bolting
• Riveting
• Locking or Pittsburgh seams
• / 3