Thermal Bridging in Buildings

A building can hit excellent U-values on every wall, roof and floor and still lose significant heat, because heat does not only flow through the middle of an element. It finds the weak points: the junctions, the more conductive materials, the geometric corners where the insulation is interrupted. These are thermal bridges, and beyond wasting energy they chill inner surfaces enough to grow mould. This lesson covers the two kinds of bridge, why they matter beyond energy, and how they are designed out.