Fiberglass insulation that is overstuffed into a wall cavity and has air spaces along the top and bottom may only perform at ____ the expected insulating value due to the installation defects.

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Fiberglass insulation relies on the air trapped between its fibers to provide insulation. When it is overstuffed into a wall cavity, it compresses these air spaces, reducing its effectiveness. Additionally, air spaces along the top and bottom create thermal bridging, further reducing its insulating capability. Despite these issues, it doesn't reduce its effectiveness to as low as one-third, one-fourth, or one-fifth, but it can perform at around one-half the expected insulating value due to these installation defects.

Fiberglass Insulation That Is Overstuffed into a Wall Cavity and Has