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// CODE SNIPPET

C405.2.3.2 Sidelight Daylight Zone

2017 FBC - Energy Conservation, 6th edition > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls (Mandatory) > C405.2.3 Daylight-Responsive Controls > C405.2.3.2 Sidelight Daylight Zone
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The sidelight daylight zone is the floor area adjacent to vertical fenestration which complies with all of the following:

  1. Where the fenestration is located in a wall, the daylight zone shall extend laterally to the nearest full-height wall, or up to 1.0 times the height from the floor to the top of the fenestration, and longitudinally from the edge of the fenestration to the nearest full-height wall, or up to 2 feet (610 mm), whichever is less, as indicated in Figure C405.2.3.2(1).
  2. Where the fenestration is located in a rooftop monitor, the daylight zone shall extend laterally to the nearest obstruction that is taller than 0.7 times the ceiling height, or up to 1.0 times the height from the floor to the bottom of the fenestration, whichever is less, and longitudinally from the edge of the fenestration to the nearest obstruction that is taller than 0.7 times the ceiling height, or up to 0.25 times the height from the floor to the bottom of the fenestration, whichever is less, as indicated in Figures C405.2.3.2(2) and C405.2.3.2(3).
  3. The area of the fenestration is not less than 24 square feet (2.23 m2).
  4. The distance from the fenestration to any building or geological formation which would block access to daylight is greater than the height from the bottom of the fenestration to the top of the building or geologic formation.
  5. Where located in existing buildings, the visible transmittance of the fenestration is not less than 0.20.

FIGURE C405.2.3.2(1)

DAYLIGHT ZONE ADJACENT TO FENESTRATION IN A WALL

FIGURE C405.2.3.2(2)

DAYLIGHT ZONE UNDER A ROOFTOP MONITOR

FIGURE C405.2.3.2(3)

DAYLIGHT ZONE UNDER A SLOPED ROOFTOP MONITOR

Related Code Sections


C405.2.3.2 [CE] Commercial Energy Efficiency, Sidelight Daylight Zone
The sidelight daylight zone is the floor area adjacent to vertical fenestration which complies with all of the following: Where ...
2017 FBC - Energy Conservation, 6th edition > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems > C405.2 Lighting Controls (Mandatory) > C405.2.3 Daylight-Responsive Controls > C405.2.3.2 Sidelight Daylight Zone
C402.4.2 [CE] Commercial Energy Efficiency, Minimum Skylight Fenestration Area
of sidelight daylight zones is less than 2,500 square feet (232 m 2 ), and where the lighting is controlled according to Section C405.2.3 ...
2020 FBC - Energy Conservation, 7th edition > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.4 Fenestration (Prescriptive) > C402.4.2 Minimum Skylight Fenestration Area
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 ...
2020 FBC - Energy Conservation, 7th edition > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.4 Fenestration (Prescriptive) > C402.4.4 Daylight Zones
C405.2.2.3 [CE] Commercial Energy Efficiency, Daylight Zone Control
Daylight zones shall be designed such that lights in the daylight zone are controlled independently of general area lighting and are controlled ...
2014 FBC - Energy Conservation, 5th edition > 4 [CE] Commercial Energy Efficiency > C405 Electrical Power and Lighting Systems (Mandatory) > C405.2 Lighting Controls (Mandatory) > C405.2.2 Additional Lighting Controls > C405.2.2.3 Daylight Zone Control
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 ...
2017 FBC - Energy Conservation, 6th edition > 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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