855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 177

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For LEED BD+C: Core and Shell projects, the requirements are only for the following items: base building fixtures and fittings, appliances, equipment, process water, and outdoor water use. For tenant spaces, project teams must include manufacturer documentation for the base building’s fixtures and fittings, appliances, and equipment, which must be part of IPp4: Tenant Guidelines .

Choose either a prescriptive or performance pathway to demonstrate compliance for fixture and fitting efficiencies.

OPTION 1. PRESCRIPTIVE PATH — MAXIMUM FLUSH AND FLOW RATES

The prescriptive path offers a streamlined approach for the prerequisite. Table 1 outlines the maximum allowable flush or flow rate for fixtures and fittings within the project boundary. All fixtures and fittings installed must not exceed these maximum values.

For projects that install dual-flush toilets, the volume of the full-flush must be used when calculating the flush rate. The full-flush rate must not exceed 1.28 gpf (4.8 lpf). A weighted average that demonstrates that the average flow is 1.28 gpf (4.8 lpf) may not be used.

Projects in the U.S. and Canada should use WaterSense-labeled toilets (water closets), urinals, private lavatory faucets, and showerheads. WaterSense-labeled products require testing and verification for efficiency by third-party vendors. These products comply with the U.S. Environmental Protection Agency [84] (U.S. EPA) specifications.

OPTION 2. PERFORMANCE PATH — CALCULATED REDUCTION

Using the performance-based approach, teams can maximize water conservation across all applicable fixtures and fittings within the project boundary. Teams pursuing points under WEc2: Enhanced Water Efficiency should consider Option 2. Performance Path – Calculated Reduction to show prerequisite compliance. Compliance with WEp2: Minimum Water Efficiency, Option 2. Performance Path – Calculated Reduction and WEc2: Enhanced Water Efficiency, Option 2. Fixtures and Fittings – Calculated Reduction requires documented compliance through the USGBC -approved calculator.

Teams must prove a reduction of 20% from the baseline water use to meet the minimum prerequisite requirements.

84 U.S. Environmental Protection Agency, https://www.epa.gov/watersense

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 167