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// CODE SNIPPET

C405.2.3.3 Toplight Daylight Zone

Energy Conservation Code 2015 of Colorado > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls (Mandatory) > C405.2.3 Daylight-Responsive Controls > C405.2.3.3 Toplight Daylight Zone
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The toplight daylight zone is the floor area underneath a roof fenestration assembly which complies with all of the following:
  1. The daylight zone shall extend laterally and longitudinally beyond the edge of the roof fenestration assembly to the nearest obstruction that is taller than 0.7 times the ceiling height, or up to 0.7 times the ceiling height, whichever is less, as indicated in Figure C405.2.3.3.
  2. No building or geological formation blocks direct sunlight from hitting the roof fenestration assembly at the peak solar angle on the summer solstice.
  3. Where located in existing buildings, the product of the visible transmittance of the roof fenestration assembly and the area of the rough opening of the roof fenestration assembly divided by the area of the daylight zone is not less than 0.008.
FIGURE C405.2.3.3
DAYLIGHT ZONE UNDER A ROOF FENESTRATION ASSEMBLY

Related Code Sections


C405.2.3.3 [CE] Commercial Energy Efficiency, Toplight Daylight Zone
The toplight daylight zone is the floor area underneath a roof fenestration assembly which complies with all of the following: The daylight zone ...
Energy Conservation Code 2015 of Colorado > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls (Mandatory) > C405.2.3 Daylight-Responsive Controls > C405.2.3.3 Toplight Daylight Zone
C402.4.4 [CE] Commercial Energy Efficiency, Daylight Zones
Daylight zones referenced in Sections C402.4.1.1 through C402.4.3.2 shall comply with Sections C405.2.3.2 and C405.2.3.3, as applicable. Daylight ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.4 Fenestration (Prescriptive) > C402.4.4 Daylight Zones
C402.4.4 [CE] Commercial Energy Efficiency, Daylight Zones
Daylight zones referenced in Sections C402.4.1.1 through C402.4.3.2 shall comply with Sections C405.2.4.2 and C405.2.4.3, as applicable. Daylight ...
Energy Conservation Code 2021 of Colorado > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.4 Fenestration > C402.4.4 Daylight Zones
C405.2.4.2 [CE] Commercial Energy Efficiency, Sidelit Daylight Zone
The sidelit daylight zone is the floor area adjacent to vertical fenestration that complies with all of the following: Where the fenestration ...
Energy Conservation Code 2021 of Colorado > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls > C405.2.4 Daylight-Responsive Controls > C405.2.4.2 Sidelit Daylight Zone
C405.2.4.3 [CE] Commercial Energy Efficiency, Toplit Daylight Zone
The toplit daylight zone is the floor area underneath a roof fenestration assembly that complies with all of the following: The toplit ...
Energy Conservation Code 2021 of Colorado > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls > C405.2.4 Daylight-Responsive Controls > C405.2.4.3 Toplit Daylight Zone
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