If you replace a window and the fiberglass insulation in the wall is dusty. This indicates that...

If you replace a window and the fiberglass insulation in the wall is dusty. This indicates that...

• A. There is air leakage into the wall cavity
• B. The insulation needs replacement
• C. Moisture intrusion
• D. Pest infestation

Answer: (A)

Dusty fiberglass insulation in a wall cavity after replacing a window points to air movement through the wall. When a window is installed, gaps around the frame and rough opening can create leakage paths. As air flows in or out, it can carry dust from inside or outside into the cavity, where it settles in the insulation. This indicates a leakage issue that should be addressed with proper sealing, flashing, and weatherstripping to stop the drafts and improve energy efficiency. Moisture intrusion would show dampness or mold, and pest infestation would show droppings or signs of gnawing, so those scenarios don’t fit the dusty insulation clue as well.

Dusty fiberglass insulation in a wall cavity after replacing a window points to air movement through the wall. When a window is installed, gaps around the frame and rough opening can create leakage paths. As air flows in or out, it can carry dust from inside or outside into the cavity, where it settles in the insulation. This indicates a leakage issue that should be addressed with proper sealing, flashing, and weatherstripping to stop the drafts and improve energy efficiency. Moisture intrusion would show dampness or mold, and pest infestation would show droppings or signs of gnawing, so those scenarios don’t fit the dusty insulation clue as well.