Which factor is described by the term j-value in building materials?

The term j-value refers to the measure of a material's ability to conduct heat, specifically under conditions that correlate to its thermal conductivity. It is an important factor when evaluating the thermal performance of insulation materials, as it quantifies how effectively a material can transfer heat. In construction and building applications, understanding the j-value helps in selecting materials that provide optimal energy efficiency and comfort in a building.

When assessing building materials, understanding their heat transfer characteristics is crucial for ensuring that structures maintain desired temperatures with minimal energy loss. The j-value directly impacts heating and cooling requirements, making it a significant consideration in energy-conscious building design and materials selection.