NACC Glazing Contractor Exam

North American Contractor Certification (NACC) Glazing Contractor Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following is the primary standard for safety glazing

materials in buildings?

A. ANSI Z97.1

B. ASTM C1036

C. ASTM E1300

D. ISO 9001

Answer: ASTM C1036

Rationale: ASTM C1036 sets standards for flat glass, including quality

and tolerance requirements, which is critical for safety glazing. 1 / 4

• When installing tempered glass in a commercial storefront, the glass

should be supported at what minimum distance from the edge?

• 1/8 inch
• 1/4 inch
• 1/2 inch
• 1 inch

Answer: 1/2 inch

Rationale: Tempered glass requires a minimum edge clearance to

prevent stress fractures and ensure proper fit within frames.

• Which glazing material is recommended for hurricane-prone regions

for maximum impact resistance?

• Annealed glass
• Laminated glass
• Tempered glass
• Wired glass

Answer: Laminated glass

Rationale: Laminated glass holds together when shattered, providing

superior impact resistance during high-wind events.

• Which ASTM standard covers the performance of insulated glass

units?

A. ASTM E2190

B. ASTM C1363

C. ASTM C1172 2 / 4

D. ASTM E1886

Answer: ASTM E2190

Rationale: ASTM E2190 outlines performance criteria and testing for

insulated glass units (IGUs), ensuring thermal performance and durability.

5. The purpose of using a setting block in a window frame is to:

• Seal the glass
• Support the glass weight
• Prevent condensation
• Hold the frame in place

Answer: Support the glass weight

Rationale: Setting blocks are installed at the bottom of the glazing

pocket to support the weight of the glass evenly.

• What is the minimum safety distance from the edge of a glass panel

for drilling holes?

• 1/4 inch
• 2 times the hole diameter
• 3 times the hole diameter
• 1 inch

Answer: 2 times the hole diameter

Rationale: This spacing reduces the risk of cracking or weakening the

glass around drilled holes. 3 / 4

• Which type of sealant is preferred for exterior glazing in commercial

curtain walls?

• Acrylic
• Silicone
• Polyurethane
• Latex

Answer: Silicone

Rationale: Silicone sealants provide long-term flexibility, UV

resistance, and adhesion to glass and metal.

• In curtain wall construction, the primary function of a pressure plate is

to:

• Seal against air infiltration
• Secure the glass in the frame
• Provide thermal insulation
• Support the structural steel

Answer: Secure the glass in the frame

Rationale: Pressure plates clamp the glass to the mullions and hold it

securely while allowing for sealant and expansion movement.

• Which glazing method allows the glass to move independently with

thermal expansion while remaining watertight?

• Butt-glazed
• Structural silicone glazing
• Captive or wet-glazed with gaskets
• / 4