Since I'm pursuing the prescriptive method of this prerequisite, I am filling out the entire AEDG. For the Daylighting and Lighting section, it asks for interior surface average reflectance in terms of 80% ceilings, 70% wall surfaces, and 50% open office partitions. In order to determine this, can i just sum up the ceilings and wall surfaces in the architecture drawings and make a percentage of the surface area which have a white surface (since white is usually reflective) out of the total surface area?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 10/25/2023 - 16:06

Typically you would use the specific paint color (all paint has a reflectance value) for the walls and for the ceiling tiles (again they have a rated reflectance). If there are mixed surface areas then yes you would take a weighted average. The partition surfaces would also have a reflectance rating.

Edgar Arevalo

Energy Engineer

ads ENGINEERS, DPC

LEEDuser Basic Member

21 thumbs up

Wed, 10/25/2023 - 19:39

Is the reflectance value for paint colors in % or some other unit? Same goes for the rated reflectance for the ceiling tiles. Because when the AEDG table says average surface reflectance in %, I can't tell if they mean % of high reflective surface over total surface or if the reflactance is in % so we just take the average of that

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 10/25/2023 - 19:57

Yes both are typically a percentage. It is technically referred to as LRV (Light Reflectance Value). Pure black is 0 and pure white is 100.

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