What is the main purpose of fiberglass batt insulation?

The primary function of fiberglass batt insulation is to prevent heat transfer by conduction. This insulation material works by trapping air within its fibers, creating a barrier that slows down the movement of heat. In colder climates, it helps keep the heat produced within a building from escaping, while in warmer climates, it slows the heat from the outside entering the living space. This capability is crucial for energy efficiency, as it helps maintain a comfortable indoor temperature without excessive reliance on heating or cooling systems, ultimately leading to energy savings.

While fiberglass batt insulation can provide some soundproofing benefits due to its density, its main design purpose is thermal resistance. Similarly, it does not primarily focus on moisture control; although it can resist some moisture, it is not intended as a moisture barrier and should be used alongside proper vapor barriers in areas where this is a concern. Additionally, fiberglass insulation does not serve to improve structural integrity, as it is not a load-bearing material, but rather a filler used in insulation applications. Thus, the emphasis on preventing heat transfer by conduction accurately highlights the essential role of fiberglass batt insulation in building performance.