855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 117

Extracted Content

ASHRAE 90.1-2022, Appendix G PRM differentiates the methodology used for new buildings, substantial alterations, and other alterations. This provides a fairer evaluation of project performance than earlier versions of ASHRAE 90.1, Appendix G PRM, where compliance was unachievable for projects with limited scope.

For projects documented using ASHRAE 90.1-2019, Appendix G PRM, the LEED rating system pairs this improved methodology from the 90.1-2022, Appendix G PRM with less stringent BPFs than from the 90.1-2019, Appendix G PRM.

ASHRAE 90.1 mandatory provisions All projects must meet mandatory provisions applicable to the project scope from the referenced version of ASHRAE 90.1, found in Sections: 5.4 (Building Envelope), 6.4 (HVAC), 7.4 (SWH), 8.4 (Power), 9.4 (Lighting), and 10.4 (Other Equipment).

Early in the design process, the project architect, engineer, and lighting designer should review these provisions and ensure they are integrated into the project design.

EXCEPTIONS TO MANDATORY PROVISIONS Project-specific exceptions or Project Priority Library alternatives to the mandatory provisions may apply to:

o Projects outside the U.S. where variations in equipment rating methodologies or

limited availability of the required equipment or controls precludes compliance.

o Provisions exempted by the local AHJ in areas regulated by codes of similar

stringency to the referenced version of ASHRAE 90.1 .

o Provisions that can be directly accounted for in ASHRAE 90.1, Appendix G PRM

energy simulation.

Further description of ASHRAE 90.1 Section 4.2.1 compliance paths

ASHRAE 90.1 4.2.1 compliance path: prescriptive method For the prescriptive method, projects must meet all requirements applicable to the project scope from each referenced ASHRAE 90.1 section. No trade-offs are permitted between the provisions of each section.

• Section 5 . Building Envelope

• Section 6 . HVAC

• Section 7 . SWH

• Section 8 . Power

• Section 9 . Lighting

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 106