100002149 | U.S. Green Building Council
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Created on January 27, 2017

LEED Interpretation

ID# 100002149

Rating System

LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools, LEED BD+C: Retail, LEED BD+C: Healthcare, LEED BD+C: Data Centers, LEED BD+C: Hospitality, LEED BD+C: Warehouses and Distribution Centers, LEED ID+C: Commercial Interiors, LEED ID+C: Retail, LEED ID+C: Hospitality

Rating System Version

v4 - LEED v4

Ref Guide Name and Edition v4:

Interior Design and Construction, v4 edition
Building Design and Construction, v4 edition

Inquiry

Is there an alternative strategy to meet the Option 1. Simulation: spatial daylight autonomy requirements for annual sunlight exposure (ASE) if the ASE (1000,250h) threshold value exceeds 10%?

Ruling

Yes, spaces with an ASE1000,250h score greater than 10.0% and less than 20.0% are acceptable with a narrative describing how the space is designed to address glare. Additionally, spaces with an automated dynamic façade system* OR spaces smaller than 250 square feet are exempt from the ASE requirement. The ASE value must still be calculated and reported.
Projects meeting an ASE1000,250h score less than 10.0% for the entire daylit area are eligible for an exemplary performance point.


*Automated dynamic façade systems are daylighting control devices whose position or light transmission level can be automatically changed by a control system to address sunlight penetration or perceived glare in the space. Acceptable automated dynamic façade systems include interior automated window blinds or shades; exterior automated louvers, shades, or blinds; or automatically controlled dynamic glazing. Automated methods of sunlight penetration or perceived glare control do not include manually operated interior or exterior façade shading systems; manually operated dynamic glazing; or fixed exterior overhangs, fins, shades, screens, awnings or louvers whose position on the fenestration cannot be automatically changed or adjusted. Automated dynamic façade systems are allowed to have manual override but must default back to automated operation after a predefined period of no longer than two hours. Dynamic glazing is further defined in ASHRAE Standard 90.1 and the International Energy Conservation Code (IECC).

Applicable Credits

Name : Daylight
Rating system : New Construction,Schools - New Construction,Retail - New Construction,Data centers - New Construction,Hospitality - New Construction,Warehouse and distribution centers - New Construction,
Rating system version : v4

Name : Daylight
Rating system : Healthcare,
Rating system version : v4

Name : Daylight
Rating system : Commercial Interiors,Retail - Commercial Interiors,Hospitality - Commercial Interiors,
Rating system version : v4

Name : Daylight
Rating system : Core and Shell,
Rating system version : v4

Credit Name Daylight
Credit Category Indoor environmental quality
International Applicable Not internationally applicable
Campus Applicable Not campus applicable
Page BD+C 736, ID+C 417
Location Definitions