Thermal Bridging is a process where the structural lumber or steel forms a bridge from the outside of the home to the inside of the home where heat can pass through by conduction. This reduces the effective insulation of many homes as they rely on dimensional lumber, referred to as studs, at regular intervals to provide structural support. There is very little dimensional lumber required to build a SIPs home because SIPs are structurally sufficient for most buildings. This reduction in lumber and careful application of foam sealant during a SIPs install create an effective, high quality insulation.