To limit the probability that the overall thermal transmittance of building envelope assemblies that have radiant heating cables, heating or cooling pipes or membranes embedded in them will exceed the prescriptive limits, which could lead to excessive thermal transfer through the building envelope, which could lead to inaccuracy of the trade-off model, which could lead to overestimation of the energy used by the reference building or underestimation of the energy used by the proposed building, which could lead to excessive use of energy, which could lead to an unacceptable effect on the environment.
To limit the probability that the design of the building envelope will not ensure the performance of the insulation by preventing the increase of overall thermal transmittance due to the effects of air leakage or convection, wetting, or moisture bypassing the plane of thermal resistance, which could lead to excessive thermal transfer through the building envelope, which could lead to excessive use of energy, which could lead to an unacceptable effect on the environment.