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A5.209.2.3.1.1 Daylight Area
The total daylight area shall not double count overlapping areas with any primary sidelit daylight area, secondary sidelit daylight area or skylit daylight area.
A5.209.2.3.1.2 Daylight Area, Primary Sidelit
is the combined primary sidelit area without double counting overlapping areas. The floor area for each primary sidelit area is directly adjacent to vertical glazing below the ceiling with an area equal to the product of the sidelit width and the primary sidelit depth.
The primary sidelit width is the width of the window plus, on each side, the smallest of:
  1. 2 feet; or
  2. The distance to any 5 feet or higher permanent vertical obstruction.
The primary sidelit depth is the horizontal distance perpendicular to the glazing which is the smaller of:
  1. One window head height; or
  2. The distance to any 5 feet or higher permanent vertical obstruction.
A5.209.2.3.1.3 Daylight Area, Secondary Sidelit
is the combined secondary sidelit area without double counting overlapping areas. The floor area for each secondary sidelit area is directly adjacent to primary sidelit area with an area equal to the product of the sidelit width and the secondary sidelit depth.
The secondary sidelit width is the width of the window plus, on each side, the smallest of:
  1. 2 feet; or
  2. The distance to any 5 feet or higher permanent vertical obstruction; or
  3. The distance to any skylit daylight area.
The secondary sidelit depth is the horizontal distance perpendicular to the glazing which begins from one window head height and ends at the smaller of:
  1. Two window head heights;
  2. The distance to any 5 feet or higher permanent vertical obstruction; or
  3. The distance to any skylit daylight area.
A5.209.2.3.1.4 Daylight Area, Skylit
is the combined daylight area under each skylight without double counting overlapping areas. The daylight area under each skylight is bounded by the rough opening of the skylight, plus horizontally in each direction the smallest of:
  1. 70 percent of the floor-to-ceiling height; or
  2. The distance to any primary sidelit area or the daylight area under rooftop monitors; or
  3. The distance to any permanent partition or permanent rack which is farther away than 70 percent of the distance between the top of the permanent partition or permanent rack and the ceiling.

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