Examination Practice Questions And

Illinois Window Installer Certification Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of flashing in window installation?
• Improve window color
• Prevent water intrusion
• Increase insulation value
• Reduce window weight

Rationale: Flashing serves as a water-management component that directs

moisture away from the opening.

• Which tool is most appropriate for checking window opening

squareness? 1 / 4

• Tape measure only
• Level only
• Measuring diagonals
• Hammer

Rationale: Diagonal measurements confirm if the opening is square

because equal diagonals mean equal corners.

• The rough opening for a window is typically how much larger than the

window frame?

• Same size
• 1/4" to 1/2" larger
• 1" larger
• 2" larger

Rationale: A slight gap is required for shimming, squaring, and insulation.

• Which component of a window provides structural support and helps

transfer load to the wall?

• Glass
• Flashing
• Frame
• Caulk 2 / 4

Rationale: The frame is responsible for transferring structural loads and

holding the sash and glazing.

• What type of window is hinged on the side and opens outward?
• Slider
• Awning
• Casement
• Double-hung

Rationale: Casement windows hinge on the side and open outward with a

crank.

• Before installing a window, what must be verified about the rough

opening?

• The paint color
• Level, plumb, and square
• Nail type
• Window warranty

Rationale: Accurate geometry ensures proper fit, function, and sealing.

• Which of the following is a common sealant for window installations? 3 / 4

• Wood glue
• Silicone or polyurethane caulk
• White glue
• Epoxy adhesive

Rationale: Flexible exterior-rated caulks provide long-term waterproof

sealing.

• What is the purpose of shims?
• Decoration
• Fastening windows
• Leveling and supporting the window frame
• Blocking airflow

Rationale: Shims allow precise adjustment and help maintain frame

alignment.

9. A properly installed drip cap is designed to:

• Stop air leaks only
• Support the sash
• Direct water away from the top of the window
• Add insulation

Rationale: Drip caps protect the head of the window from water

infiltration.

• / 4