Virginia Glass and Glazing Contractor
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1. Which of the following best describes the primary role of the Virginia
Glass and Glazing Contractor (GLZ) classification under DPOR
regulations?
A. To perform only decorative glass installation in residential homes
B. To install, repair, and remove all types of glass systems including
glazing, framing, sealants, and glass substitutes in structures
C. To manufacture raw float glass for industrial distribution
D. To inspect building electrical systems related to storefront
installations
The GLZ classification primarily covers the installation, repair, and
, removal of glass systems, including glazing work, framing, doors, and
sealant applications across residential and commercial structures.
2. Which of the following types of glass is most appropriate for high-
impact commercial storefront applications?
A. Annealed glass
B. Float glass
C. Tempered glass
D. Patterned glass
Tempered glass is heat-treated to increase strength and safety,
breaking into small blunt fragments, making it ideal for high-impact
storefront environments.
3. What is the main function of an insulated glass unit (IGU) spacer?
A. To decorate the glass edge
B. To permanently bond glass panes together
C. To maintain separation between panes and support thermal
insulation and sealing
D. To increase glass transparency
The spacer ensures consistent separation between panes, contains
desiccant, and helps maintain the insulating air or gas space.
4. Which condition is most likely to cause failure in insulated glass units?
A. Excessively thick glass
B. Improper edge sealing allowing moisture infiltration
C. Use of laminated glass
, D. Use of tinted glass
Improper sealing allows moisture and air infiltration, leading to
condensation and IGU seal failure.
5. What is the primary purpose of sealants in exterior glazing systems?
A. To add aesthetic color contrast
B. To hold glass permanently in place
C. To prevent air and water infiltration while allowing structural
movement
D. To harden the aluminum frame
Sealants provide weatherproofing while accommodating expansion
and contraction of building materials.
6. In commercial glazing, why are backer rods installed in joints?
A. To increase glass weight capacity
B. To provide insulation only
C. To control sealant depth and support proper adhesion and joint
movement
D. To permanently lock glass panels in place
Backer rods ensure correct sealant geometry, prevent three-sided
adhesion, and allow joint flexibility.
7. Which glazing material is best suited for hurricane-prone coastal
regions?
A. Single-pane annealed glass
B. Wired glass panels
, C. Laminated impact-resistant glass with reinforced framing
D. Standard float glass
Laminated impact-resistant glass helps resist windborne debris and
maintains structural integrity during storms.
8. What is a common cause of fogging inside insulated glass units?
A. Excessively thick frames
B. Failure of edge seal allowing moisture ingress
C. Use of Low-E coatings
D. Overuse of desiccant
Seal failure allows moisture to enter the cavity, causing condensation
and visible fogging.
9. What is the function of pressure plates in storefront glazing systems?
A. To reduce thermal conductivity
B. To secure glass panels and distribute loads evenly within the frame
C. To provide decorative framing
D. To allow glass expansion without seals
Pressure plates mechanically retain glass and distribute loads to
prevent stress concentrations.
10. Which type of glass is required in guardrails or safety railing
systems?
A. Annealed glass
B. Float glass
C. Tempered or laminated safety glass
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which of the following best describes the primary role of the Virginia
Glass and Glazing Contractor (GLZ) classification under DPOR
regulations?
A. To perform only decorative glass installation in residential homes
B. To install, repair, and remove all types of glass systems including
glazing, framing, sealants, and glass substitutes in structures
C. To manufacture raw float glass for industrial distribution
D. To inspect building electrical systems related to storefront
installations
The GLZ classification primarily covers the installation, repair, and
, removal of glass systems, including glazing work, framing, doors, and
sealant applications across residential and commercial structures.
2. Which of the following types of glass is most appropriate for high-
impact commercial storefront applications?
A. Annealed glass
B. Float glass
C. Tempered glass
D. Patterned glass
Tempered glass is heat-treated to increase strength and safety,
breaking into small blunt fragments, making it ideal for high-impact
storefront environments.
3. What is the main function of an insulated glass unit (IGU) spacer?
A. To decorate the glass edge
B. To permanently bond glass panes together
C. To maintain separation between panes and support thermal
insulation and sealing
D. To increase glass transparency
The spacer ensures consistent separation between panes, contains
desiccant, and helps maintain the insulating air or gas space.
4. Which condition is most likely to cause failure in insulated glass units?
A. Excessively thick glass
B. Improper edge sealing allowing moisture infiltration
C. Use of laminated glass
, D. Use of tinted glass
Improper sealing allows moisture and air infiltration, leading to
condensation and IGU seal failure.
5. What is the primary purpose of sealants in exterior glazing systems?
A. To add aesthetic color contrast
B. To hold glass permanently in place
C. To prevent air and water infiltration while allowing structural
movement
D. To harden the aluminum frame
Sealants provide weatherproofing while accommodating expansion
and contraction of building materials.
6. In commercial glazing, why are backer rods installed in joints?
A. To increase glass weight capacity
B. To provide insulation only
C. To control sealant depth and support proper adhesion and joint
movement
D. To permanently lock glass panels in place
Backer rods ensure correct sealant geometry, prevent three-sided
adhesion, and allow joint flexibility.
7. Which glazing material is best suited for hurricane-prone coastal
regions?
A. Single-pane annealed glass
B. Wired glass panels
, C. Laminated impact-resistant glass with reinforced framing
D. Standard float glass
Laminated impact-resistant glass helps resist windborne debris and
maintains structural integrity during storms.
8. What is a common cause of fogging inside insulated glass units?
A. Excessively thick frames
B. Failure of edge seal allowing moisture ingress
C. Use of Low-E coatings
D. Overuse of desiccant
Seal failure allows moisture to enter the cavity, causing condensation
and visible fogging.
9. What is the function of pressure plates in storefront glazing systems?
A. To reduce thermal conductivity
B. To secure glass panels and distribute loads evenly within the frame
C. To provide decorative framing
D. To allow glass expansion without seals
Pressure plates mechanically retain glass and distribute loads to
prevent stress concentrations.
10. Which type of glass is required in guardrails or safety railing
systems?
A. Annealed glass
B. Float glass
C. Tempered or laminated safety glass
