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; prescr

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.