What material is used in construction to prevent heat passage?

Insulation is specifically designed to reduce the transfer of heat, making it a crucial material in construction for energy efficiency and thermal control. It works by trapping air pockets, which hinder the flow of heat—keeping indoor spaces warm in the winter and cool in the summer. Insulation is commonly used in walls, roofs, and floors, and comes in various forms such as foam boards, fiberglass batts, and spray foam, each serving to improve energy efficiency and comfort in buildings.

In contrast, drywall, while integral to construction for creating walls and ceilings, does not have insulating properties and is primarily used for aesthetic finishes. Concrete is known for its strength and durability but can actually conduct heat rather than insulate against it. Veneer is typically a thin decorative layer and is not intended for heat resistance or insulation. Thus, insulation stands out as the material specifically tailored for the objective of preventing heat passage.