South Carolina Glass and Glazing
Contractor License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale
2026 Q&A| Instant Download Pdf
Graded A+
Domain 1: General Glazing
1. Which of the following best describes the primary purpose of
glazing in a building?
A) To provide structural support
B) To enhance aesthetic appearance only
C) To protect against weather and improve energy efficiency
D) To reduce interior space
Answer: C
Rationale: Glazing's primary function is to protect the building from the
elements and contribute to energy efficiency by managing heat loss or
gain. While aesthetics are important, they are secondary to weather
protection and thermal performance .
2. What is a primary concern when installing large glass panels?
A) Matching the interior paint
B) Structural load and wind pressure
, C) The age of the glass
D) The price of the glass
Answer: B
Rationale: Large glass panels must be evaluated for structural loads and
wind pressures to ensure safe and durable installation. Wind loads can be
significant on large glass surfaces, making this a critical consideration .
3. What is the effect of low-emissivity (Low-E) coatings on glazing?
A) Increased UV transmission
B) Reduced thermal loss
C) Reduced structural integrity
D) Increased glare
Answer: B
Rationale: Low-E coatings are microscopically thin layers applied to glass
to reflect infrared energy (heat), which helps reduce heat transfer and
improve a building's energy efficiency .
4. Laminated glass is best described as:
A) Glass that has been heat-treated for strength
B) Glass with a metal wire mesh embedded in it
C) Multiple layers of glass bonded with an interlayer
D) A single pane of thick glass
Answer: C
Rationale: Laminated glass is a type of safety glass that holds together
when shattered. It is constructed by bonding two or more layers of glass
with a plastic interlayer, typically PVB (Polyvinyl Butyral) .
5. Which type of glass is required by code for use in shower doors and
enclosures?
, A) Wired glass
B) Tempered glass
C) Laminated glass
D) Low-E glass
Answer: B
Rationale: Tempered glass is heat-treated to be significantly stronger and,
more importantly, shatters into small, relatively harmless granular pieces
upon breakage, reducing injury risk. It is required in hazardous locations
like shower doors .
Domain 2: Glass Systems & Installation
6. What is a primary advantage of a curtain wall system over
traditional window systems?
A) It provides structural support for the building
B) It is load-bearing and supports the entire building
C) It allows for continuous glass facades with minimal framing
D) It is only used for interior partitions
Answer: C
Rationale: A curtain wall is a non-structural outer covering of a building
that allows for extensive, continuous glass facades with minimal visible
framing, creating a modern aesthetic and allowing for maximum natural
light .
7. In insulated glass units (IGUs), the spacer serves what main purpose?
A) To hold the glass together permanently
B) To maintain a uniform gap between panes
C) To improve the aesthetic look
D) To provide additional weight
, Answer: B
Rationale: Spacers in IGUs are placed between the panes of glass to
maintain a consistent gap, which is then sealed and often filled with an
insulating gas like argon. This gap is essential for the unit's thermal
performance .
8. When installing a heavy glass panel, which of the following is the
correct procedure?
A) Use manual force only
B) Use mechanical lifting devices and proper support
C) Install it without any safety gear
D) Slide it into place using friction
Answer: B
Rationale: Heavy glass panels require the use of mechanical lifting devices
(like suction cups or glass lifters) and proper support to ensure safe
handling and precise placement, preventing injury and damage to the
glass .
9. What does the term "thermal break" refer to in glazing systems?
A) A sudden drop in glass strength
B) A method to interrupt the flow of heat
C) A crack in the glass surface
D) The edge treatment of glass
Answer: B
Rationale: A thermal break is a barrier of low-conductivity material (like
plastic or rubber) integrated into metal frames to reduce the conduction of
heat or cold through the metal, thereby improving the overall energy
performance of the window system .
Contractor License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale
2026 Q&A| Instant Download Pdf
Graded A+
Domain 1: General Glazing
1. Which of the following best describes the primary purpose of
glazing in a building?
A) To provide structural support
B) To enhance aesthetic appearance only
C) To protect against weather and improve energy efficiency
D) To reduce interior space
Answer: C
Rationale: Glazing's primary function is to protect the building from the
elements and contribute to energy efficiency by managing heat loss or
gain. While aesthetics are important, they are secondary to weather
protection and thermal performance .
2. What is a primary concern when installing large glass panels?
A) Matching the interior paint
B) Structural load and wind pressure
, C) The age of the glass
D) The price of the glass
Answer: B
Rationale: Large glass panels must be evaluated for structural loads and
wind pressures to ensure safe and durable installation. Wind loads can be
significant on large glass surfaces, making this a critical consideration .
3. What is the effect of low-emissivity (Low-E) coatings on glazing?
A) Increased UV transmission
B) Reduced thermal loss
C) Reduced structural integrity
D) Increased glare
Answer: B
Rationale: Low-E coatings are microscopically thin layers applied to glass
to reflect infrared energy (heat), which helps reduce heat transfer and
improve a building's energy efficiency .
4. Laminated glass is best described as:
A) Glass that has been heat-treated for strength
B) Glass with a metal wire mesh embedded in it
C) Multiple layers of glass bonded with an interlayer
D) A single pane of thick glass
Answer: C
Rationale: Laminated glass is a type of safety glass that holds together
when shattered. It is constructed by bonding two or more layers of glass
with a plastic interlayer, typically PVB (Polyvinyl Butyral) .
5. Which type of glass is required by code for use in shower doors and
enclosures?
, A) Wired glass
B) Tempered glass
C) Laminated glass
D) Low-E glass
Answer: B
Rationale: Tempered glass is heat-treated to be significantly stronger and,
more importantly, shatters into small, relatively harmless granular pieces
upon breakage, reducing injury risk. It is required in hazardous locations
like shower doors .
Domain 2: Glass Systems & Installation
6. What is a primary advantage of a curtain wall system over
traditional window systems?
A) It provides structural support for the building
B) It is load-bearing and supports the entire building
C) It allows for continuous glass facades with minimal framing
D) It is only used for interior partitions
Answer: C
Rationale: A curtain wall is a non-structural outer covering of a building
that allows for extensive, continuous glass facades with minimal visible
framing, creating a modern aesthetic and allowing for maximum natural
light .
7. In insulated glass units (IGUs), the spacer serves what main purpose?
A) To hold the glass together permanently
B) To maintain a uniform gap between panes
C) To improve the aesthetic look
D) To provide additional weight
, Answer: B
Rationale: Spacers in IGUs are placed between the panes of glass to
maintain a consistent gap, which is then sealed and often filled with an
insulating gas like argon. This gap is essential for the unit's thermal
performance .
8. When installing a heavy glass panel, which of the following is the
correct procedure?
A) Use manual force only
B) Use mechanical lifting devices and proper support
C) Install it without any safety gear
D) Slide it into place using friction
Answer: B
Rationale: Heavy glass panels require the use of mechanical lifting devices
(like suction cups or glass lifters) and proper support to ensure safe
handling and precise placement, preventing injury and damage to the
glass .
9. What does the term "thermal break" refer to in glazing systems?
A) A sudden drop in glass strength
B) A method to interrupt the flow of heat
C) A crack in the glass surface
D) The edge treatment of glass
Answer: B
Rationale: A thermal break is a barrier of low-conductivity material (like
plastic or rubber) integrated into metal frames to reduce the conduction of
heat or cold through the metal, thereby improving the overall energy
performance of the window system .
