This prerequisite only includes core water uses—bathroom lavatories, water closets, urinals, showers, kitchen faucets and pre-rinse sprays. Janitors’ sinks, pot fillers, and tub faucets can be left out as they are used to fill containers with a fixed water volume regardless of the flow rate. "Kitchen sinks" includes all sinks in public or private buildings that are used with patterns and purposes similar to a sink in a residential kitchen. Break room sinks would be included; commercial kitchen sinks are not included.
The baseline for commercial lavatory faucets has been changed in LEED 2009 to 0.5 gpm. The previous baseline for commercial lavatory faucets was 2.5 gpm. Take note of this more stringent requirement compared with earlier versions of LEED.
Although reverberation time measurements can be taken after construction to show prerequisite compliance, this is a risky path because a redesign might be the only way to attain the prerequisite and could prevent LEED certification.
Keeping classrooms smaller than 20,000 ft3 allows you to follow the easier Case 1 compliance path, this will eliminate the need to run RT calculations.
Are composting toilets an option? While not common, composting toilets can go a long way toward achieving this prerequisite. They affect programming and layout, so consider them early.
Check with your local jurisdiction to see if the ANSI/ASA S12.60 standard has been adopted for the construction of schools and classrooms. Among jurisdictions that have adopted the standard are the New Hampshire Department of Education, the New Jersey School Construction Board, the State of Connecticut, the Ohio School Facility Commission, New York City Public Schools, and Arlington County (VA) Public Schools.
