855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 308

Extracted Content

Performance index For the ASHRAE 90.1 Appendix G baseline and proposed models, extract the building peak coincident heating load and the building peak coincident cooling load.

Calculate the Baseline Building Performance (BBP), the Proposed Building Performance (PBP), and the Performance Index (PI) by replacing the cost metric with the sum of building peak coincident heating load and building peak coincident cooling load.

Equation 5. Performance index (PI)

𝑃𝐼 = [𝑃𝐵𝑃]

𝐵𝐵𝑃

For this path, neither building performance factors (BPFs) nor performance index targets (PIt) are used. Per Table 4 of the Rating System, points achievement is directly linked to the Performance Index equal to the ratio of peak thermal loads for the proposed building compared to the baseline building that meets ASHRAE 90.1-2004 prescriptive criteria.

REQUIREMENTS EXPLAINED: CORE AND SHELL

Option 1. Infiltration

Same as LEED BD+C: New Construction, Option 1, except:

Core and Shell projects are not required to meet the Balanced Ventilation requirements of this option.

Option 2. Ventilation Energy Recovery

Same as LEED BD+C: New Construction, Option 2, if:

Option 2 is only available to LEED BD+C: Core and Shell projects that include fan systems within the project scope of work. At least 50% of the total ventilation air required by the ASHRAE Standard 62.1-2022, Ventilation Rate Procedure must be installed as part of the Base Building scope of work.

Option 3. Thermal Bridging

Same as LEED BD+C: New Construction, Option 3, except:

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 298