What is thermal bridging?

• A. A path of least resistance through which heat flows in a building assembly.
• B. A special kind of insulation material.
• C. An energy-efficient window coating.
• D. A moisture barrier.

Answer: (A)

Thermal bridging happens when parts of a building envelope are more conductive than the surrounding insulated areas, creating a path for heat to flow through the assembly. Structural elements like studs, concrete slabs, metal connections, and corners often have higher thermal conductivity, so heat (or cold) moves more easily through these points than through the insulated gaps. This creates bridges where heat loss is concentrated, reducing the overall effectiveness of the insulation, and can lead to cold spots on interior surfaces and potential condensation.

In green architecture, reducing these bridges improves energy efficiency and occupant comfort by keeping temperatures more uniform and lowering heating and cooling loads. The description that fits this concept is a path of least resistance through which heat flows in a building assembly. It’s not a special insulation material, a window coating, or a moisture barrier.