What is insulation primarily used for in buildings?

Insulation is primarily utilized in buildings to resist heat passage, which is critical for maintaining energy efficiency and comfort within the living spaces. By minimizing the conduction of heat between the interior and exterior environments, insulation helps to keep homes warm in the winter and cool in the summer. This resistance to heat transfer contributes significantly to lowering heating and cooling costs and improving overall energy efficiency.

In practice, effective insulation materials create a thermal barrier that slows down the flow of heat. This principle is essential in meeting building codes and energy efficiency standards, as it directly impacts the thermal performance of a building. By ensuring that heat does not easily escape or enter a home, insulation plays a pivotal role in reducing energy consumption and enhancing occupant comfort. Thus, its primary function aligns perfectly with the concept of resisting heat passage.