LEED v5 BD+C Rating System_November 2025_clean - Page 101
Extracted Content
- Compartmentalize each residential dwelling unit to minimize leakage between units. Perform a blower door test of residential dwelling units, following the procedures in ANSI/RESNET/ICC 380 or equivalent. For each unit tested, demonstrate a maximum leakage of enclosure area that is no more than 1.5 times the thresholds identified in Table 1 (enclosure area refers to all surfaces enclosing the dwelling unit, including exterior and party walls, floors, and ceilings). Demonstrate a weighted average leakage of the enclosure area for the building, including dwelling units, that complies with the caps in the limits identified in Table 1.
AND/OR
Option 2. Ventilation Energy Recovery (1 point)
Each fan system supplying outdoor air must have an energy or heat recovery system with a minimum 70% enthalpy recovery ratio or a minimum of 75% sensible heat recovery ratio. Provisions must be made to bypass or control the energy recovery system during moderate outside air conditions.
In aggregate, fan systems supplying less than 15% of the project’s total outdoor air can be excluded.
Core and Shell only Fan systems must supply a minimum of 50% of the ventilation air required for the project per ASHRAE Standard 62.1-2022, Ventilation Rate Procedure, to qualify for this option.
AND/OR
Option 3. Thermal Bridging (1 point)
Comply with the prescriptive thermal bridging requirements of ASHRAE 90.1-2022, Section 5.5.5(a), including all applicable requirements of Sections 5.5.5.1–5.5.5.5, without applying exceptions for projects in climate zones 0–3.
AND/OR
Option 4. Peak Thermal Load Reductions (1–3 points)
Comply with the following:
-
Ventilation loads must be included in the determination of peak coincident loads.
-
Measure building envelope air leakage using air leakage testing and use the measured air leakage to calculate the peak loads for Path 1, Path 2 (envelope), and Path 3. (Meeting the leakage rates in Option 1 is not required to pursue this option.)
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, November 2025 Edition 94