How do I measure the zone floor area for the Prescriptive Method? I'm getting thrown off by the footnote on the calculator which reads: "The zone size can be reduced as needed to increase the window to floor area ratio."

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TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Fri, 04/26/2013 - 12:44

What that means is if you WFRxVLT is over over 0,18, you can reduce the size of your daylighting zone till it falls in between 0.15 and 0.18. Many times if you follow the method of establishing the daylighting zone, the entire area will not be compliant, which hurts you in earning the credit, by allowing you to reduce the zone area, you can then have at least some compliant area helping you in achieving the credit.

Jill Perry, PE

Consultant

Jill Perry, LLC

LEEDuser Expert

298 thumbs up

Fri, 04/26/2013 - 13:51

In my understanding, you can only adjust the size of your zone if it is UNDER 0.150, not if it is over 0.180. See the formula I posted on this site to Gabriela on Dec 14, 2012.

TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Fri, 04/26/2013 - 13:57

Jill is correct, I have had only two cups of coffee this morning.

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Zone floor area for Prescriptive Method

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