Which aspect of the Residential Code ensures energy efficiency?

The aspect of the Residential Code that ensures energy efficiency is primarily related to the building envelope and insulation requirements. The building envelope is the physical barrier separating the conditioned (interior) environment from the unconditioned (exterior) environment. This includes walls, roofs, floors, doors, and windows. Proper insulation and sealing within this envelope are crucial in minimizing heat loss in the winter and heat gain in the summer, thereby significantly reducing the energy consumption required for heating and cooling.

By establishing specific criteria for insulation levels, thermal performance of windows and doors, and air leakage rates, the code aims to promote designs that contribute to lower energy bills and enhance overall comfort within the home. These requirements are part of a larger effort to address climate change and promote sustainable building practices, making energy efficiency a fundamental goal of the code.

Other options, while they can contribute to overall building performance and sustainability, do not specifically address energy efficiency in the same direct manner as the building envelope and insulation requirements do.