855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 224
Extracted Content
Early in the design process, the project architect, engineer, and lighting designer should review these provisions and ensure they get integrated into the project design.
Exceptions to Mandatory Provisions Project-specific exceptions or Project Priority Library alternatives to the mandatory provisions may apply to:
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Projects outside the United States where variations in equipment rating methodologies or limited availability of the required equipment or controls preclude compliance.
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Provisions exempted by the local authority having jurisdiction in areas regulated by codes of similar stringency to the referenced version of ASHRAE 90.1 .
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Provisions available in ASHRAE 90.1, Appendix G PRM energy simulation.
Further Description of ASHRAE 90.1, Section 4.2.1 Compliance Paths
PRESCRIPTIVE METHOD
For the prescriptive method, projects must meet all applicable requirements from each referenced ASHRAE 90.1 section. The provisions of each section don’t permit trade-offs.
- Section 5. Building Envelope
- Section 6. Heating Ventilation and Air Conditioning (HVAC)
- Section 7. Service Water Heating
- Section 8. Power
- Section 9. Lighting
- Section 10. Other Equipment
For ASHRAE 90.1-2022, Section 11. Additional Efficiency Requirements
This method provides a straightforward, easy-to-follow path to compliance, especially for smaller projects or those with less complex designs where flexibility is less of a concern.
The prescriptive method specifies minimum requirements for various building components, such as insulation levels, window performance, lighting power densities, HVAC system efficiencies, and system controls. [90 ]
90 “ASHRAE Standard 90.1 Performance Based Compliance,” U.S. Department of Energy Building Energy Codes Program, https://www.energycodes.gov/performance_based_compliance.
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 214