What is one effect of thermal bridging on insulation?

Thermal bridging occurs when materials with high thermal conductivity create a pathway for heat transfer through building elements. This can lead to significant energy loss in the insulated envelope of a structure. When thermal bridges form, they allow heat to bypass the insulating material, effectively reducing the overall thermal resistance of the insulated system.

As a result, the presence of thermal bridging leads to a decrease in the total R-value, which is a measure of thermal resistance. Insulation works by resisting heat flow, and when heat can easily pass through a thermal bridge, it diminishes the insulation's effectiveness in maintaining desired temperature levels within a building. This principle is critical in energy-efficient design and underscores the importance of addressing thermal bridging when installing insulation to ensure optimal performance.