To limit the probability that the thermal bridging effect of closely spaced, repetitive structural members and of ancillary members will not be accounted for in the calculation of the effective thermal resistance of assemblies, which could lead to an overestimation of the effective thermal resistance of the assembly, which could lead to excessive thermal transfer through the building envelope, which could lead to excessive use of energy for heating and cooling, which could lead to an unacceptable effect on the environment.