Thermal bridging is a critical concept in building science, referring to the phenomenon where heat flows through a path of higher conductivity than the surrounding insulation. In building envelopes, such as walls, roofs, and floors, thermal bridges occur when materials like concrete, steel, or wood frames penetrate the insulation layer. These paths allow heat to escape easily during winter and enter during summer, significantly reducing the overall energy efficiency of a structure. For instance, a concrete balcony slab extending through an insulated wall acts as a direct thermal bridge, causing localized cold spots, condensation, and potential mold growth. The impact of thermal bridging is substantial: studies show it can increase heat loss by 30% or more compared to a fully insulated envelope. To mitigate these effects, designers use strategies like continuous external insulation, thermal break materials, and careful detailing at junctions. For example, adding rigid foam insulation over structural frames or using thermally broken window frames can interrupt the bridge. Understanding and addressing thermal bridging is essential for achieving high-performance buildings, reducing energy bills, and improving occupant comfort. By prioritizing thermal continuity in envelope design, we can create more sustainable and resilient homes and commercial spaces.