Complete performance and baseline calculations in the LEED Online credit form using fixture data and occupancy and usage information. For plumbing systems substantially completed before 1993, the baseline is set at 160% of the IPC/UPC-compliant figure; however, for systems substantially completed in 1993 or later, the baseline is set at 120% of the water usage with code-compliant fixtures. If you have a pre-1993 building and have simply replaced bathroom fixtures without performing a more complete renovation of the bathroom structure and plumbing system, you’re allowed to use the 160% baseline for all of your fixtures.
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