What does the term "thermal bridging" refer to?

The term "thermal bridging" refers to the phenomenon where heat transfer occurs through structural components of a building, such as walls, rafters, or studs, which are typically more conductive than the insulating materials surrounding them. This results in a reduction of the overall effectiveness of insulation, as these conductive materials can allow heat to flow in or out more easily than the insulated areas. Consequently, thermal bridges can lead to energy loss, increased heating and cooling costs, and potential condensation issues within the building envelope.

Understanding thermal bridging is essential for designing energy-efficient buildings, as it informs the selection and placement of insulation materials to minimize heat transfer through these structural elements. This concept is particularly relevant in roofing systems, where proper insulation and the avoidance of thermal bridging can significantly impact energy efficiency and comfort levels within the building.