Building Envelope Law and Legal Definition

According to 10 CFR 434.201 [Title 10 – Energy; Chapter II -- Department of Energy; Subchapter D -- Energy Conservation; Part 434 -- Energy Code for New Federal Commercial and Multi-Family High Rise Residential Buildings; Subpart B -- Definitions], the term building envelope means “the elements of a building that enclose conditioned spaces through which thermal energy may be transferred to or from the exterior or to or from unconditioned spaces.”