In addition to meeting the mandatory requirements, the project must demonstrate that the energy use of the project is equivalent to ASHRAE 90.1-2007. This can be demonstrated by complying with the prescriptive checklist or simulating whole-building energy use with an energy model, also known as the performance option.
The mandatory provisions (Section x.4) are separate from and in addition to the prescriptive requirements (Sections x.6) of ASHRAE 90.1. The two are commonly but incorrectly used interchangeably. None of the mandatory provisions can be compromised; prescriptive requirements, however, provide a way to meet the minimum efficiency requirements of this prerequisite and offer multiple options for doing so.
Non-compliance with any of the requirements disqualifies the project from LEED certification. All projects, including remodeling projects, must meet the requirements for all components and systems within the scope of the fit-out. Exemptions include buildings designated “historically significant” by a recognized authority (such as the U.S. Dept. of the Interior), 24-hour facilities, equipment and portions of building systems that use energy primarily to provide for industrial, manufacturing, or commercial processes.
Mandatory provisions of ASHRAE 90.1-2007, Sections 5–10, can be stricter than local codes and should be understood at the beginning of the design phase.
Lighting control requirements can present a problem if they are not properly understood early in the design stage. Have your lighting designer become familiar with section 9.4, which spells out the requirements for lighting controls and automation systems.
The MEP team should become familiar with the minimum efficiencies required for heating, cooling, and hot water equipment listed in ASHRAE 90.1-2007, Tables 6.8.1 and 7.8.
