I have a LEED-NC 2009 hotel project and I am testing various fixtures in the WEp1 template. Although the LEED-NC reference guide says that for residential uses, both WCs and lavatories should be calculated at 5 uses/occupant/day, the several templates I tested (online and offline) use 0 uses per day as a default. This is frustrating, in that we cannot get any benefit out of our lower flow aerators, and nothing I do with the other fixtures can get the project to better than about 37.7% improved efficiency. If I manually put in the 5 uses/day/occupant with a 1.0 lav, we do great, but I don't know if there is a standard policy not to count this fixture. Can anyone guide me on this?

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Michelle Rosenberger

Partner

ArchEcology

LEEDuser Premium Member

421 thumbs up

Mon, 07/29/2013 - 16:14

Hi Susan, I have had many instances when the default uses either don't calculate or mis-calculate. I beleive this happens when there is a mix of residential and commercial users. Despite the fixture group separations, the template still seems to struggle. In those case, I have simply unchecked the default and manually entered the appropriate uses and uploaded the explanatory calc. 5 uses is correct for residential use for both fixtures. A 1.0 lav for hotel residents which is considered private use is the appropriate baseline. Sounds like you are on the right track filling in the correct uses per day. Make sure you upload your explanation.

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