hoone piirdetarindi osa, kus muidu ühtlaselt väike soojusläbivus on lokaalselt suurem soojustuse katkestuse, materjalist suurema soojuserijuhtivusega materjali läbiviigu, piirdetarindi geomeetria muutuse või muul sellisel põhjusel, part of the building envelope where the otherwise uniform thermal resistance is significantly changed by full or partial penetration of the building envelope by materials with a different thermal conductivity, and/or a change in thickness of the fabric, and/or a difference between internal and external areas, such as occur at wall/floor/ceiling junctions, a localised area of the building envelope where the heat flow is different (usually increased) in comparison with adjacent areas (if there is a difference in temperature between the inside and the outside), a component, assembly or area of the building envelope that has noticeably higher thermal conductivity than the surrounding area of a house's structure, allowing heat to transfer more easily in and out across the envelope