Minnesota Window and Door
Installation Contractor Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of flashing around a window installation?
A. Improve interior appearance
B. Reduce sound transmission
C. Support the glass unit
D. Prevent water intrusion
Answer: D. Prevent water intrusion
Rationale: Flashing directs water away from the opening and helps
prevent moisture damage to wall assemblies.
2. Which tool is commonly used to verify that a window frame is level?
,A. Speed square
B. Chalk line
C. Spirit level
D. Utility knife
Answer: C. Spirit level
Rationale: A spirit level confirms horizontal and vertical alignment during
installation.
3. What does the term "rough opening" refer to?
A. Finished window size
B. Window glass area
C. Framed opening prepared to receive the window
D. Exterior trim dimensions
Answer: C. Framed opening prepared to receive the window
Rationale: The rough opening is the structural opening into which the
window or door is installed.
4. Which building component primarily resists air infiltration around
installed windows?
A. Exterior paint
B. Interior casing
,C. Glass coating
D. Air sealing materials
Answer: D. Air sealing materials
Rationale: Sealants, foam, and weather-resistant barriers help reduce air
leakage.
5. Why are shims used during window installation?
A. To increase glass thickness
B. To waterproof the opening
C. To provide alignment and support
D. To decorate the frame
Answer: C. To provide alignment and support
Rationale: Shims help ensure the window is plumb, level, square, and
properly supported.
6. Which factor most affects thermal performance of a window?
A. Frame color
B. Trim style
C. Hardware finish
D. U-factor
Answer: D. U-factor
, Rationale: U-factor measures heat transfer through a window assembly.
Lower values indicate better insulation.
7. What is the function of a drip cap above a window?
A. Improve ventilation
B. Increase daylight
C. Direct water away from the opening
D. Secure glass panes
Answer: C. Direct water away from the opening
Rationale: Drip caps help shed water and reduce moisture intrusion.
8. A window frame that is not square may result in:
A. Better insulation
B. Stronger operation
C. Lower energy costs
D. Operational problems
Answer: D. Operational problems
Rationale: Out-of-square installations can cause binding, poor sealing, and
difficulty opening or closing.
9. Which code requirement is commonly associated with sleeping
rooms?
Installation Contractor Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of flashing around a window installation?
A. Improve interior appearance
B. Reduce sound transmission
C. Support the glass unit
D. Prevent water intrusion
Answer: D. Prevent water intrusion
Rationale: Flashing directs water away from the opening and helps
prevent moisture damage to wall assemblies.
2. Which tool is commonly used to verify that a window frame is level?
,A. Speed square
B. Chalk line
C. Spirit level
D. Utility knife
Answer: C. Spirit level
Rationale: A spirit level confirms horizontal and vertical alignment during
installation.
3. What does the term "rough opening" refer to?
A. Finished window size
B. Window glass area
C. Framed opening prepared to receive the window
D. Exterior trim dimensions
Answer: C. Framed opening prepared to receive the window
Rationale: The rough opening is the structural opening into which the
window or door is installed.
4. Which building component primarily resists air infiltration around
installed windows?
A. Exterior paint
B. Interior casing
,C. Glass coating
D. Air sealing materials
Answer: D. Air sealing materials
Rationale: Sealants, foam, and weather-resistant barriers help reduce air
leakage.
5. Why are shims used during window installation?
A. To increase glass thickness
B. To waterproof the opening
C. To provide alignment and support
D. To decorate the frame
Answer: C. To provide alignment and support
Rationale: Shims help ensure the window is plumb, level, square, and
properly supported.
6. Which factor most affects thermal performance of a window?
A. Frame color
B. Trim style
C. Hardware finish
D. U-factor
Answer: D. U-factor
, Rationale: U-factor measures heat transfer through a window assembly.
Lower values indicate better insulation.
7. What is the function of a drip cap above a window?
A. Improve ventilation
B. Increase daylight
C. Direct water away from the opening
D. Secure glass panes
Answer: C. Direct water away from the opening
Rationale: Drip caps help shed water and reduce moisture intrusion.
8. A window frame that is not square may result in:
A. Better insulation
B. Stronger operation
C. Lower energy costs
D. Operational problems
Answer: D. Operational problems
Rationale: Out-of-square installations can cause binding, poor sealing, and
difficulty opening or closing.
9. Which code requirement is commonly associated with sleeping
rooms?
