Provide for the building occupants a connection between indoor spaces and the outdoors through the introduction of daylight and views into the regularly occupied areas of the building.
Through one of the three optional methodologies, achieve daylighting through one of the three options below in at least the following spaces:
- 75% of all classroom spaces (1 point), or
- 90% of all classroom spaces (2 points), or
- 75% of all other regularly occupied spaces (1 additional point). Project teams can only achieve a point for these other spaces if they have also achieved at least one point for classroom spaces.
Option 1 — Calculation
Achieve a minimum glazing factor of 2%. The glazing factor is calculated as follows:
|Glazing Factor||Window Area [SF]||Window Geometry Factor||Actual T vis||Window Height Factor|
|Floor Area [SF]||Minimum T vis|
Option 2 — Simulation
Demonstrate, through computer simulation, that a minimum daylight illumination level of 25 footcandles has been achieved. Modeling must demonstrate 25 horizontal footcandles under clear sky conditions, at noon, on the equinox, at 30 inches above the floor.
Option 3 — Measurement
Demonstrate, through records of indoor light measurements, that a minimum daylight illumination level of 25 footcandles has been achieved. Measurements must be taken on a 10-foot grid for all occupied spaces and must be recorded on building floor plans.
In all cases, only the square footage associated with the portions of rooms or spaces meeting the minimum illumination requirements can be applied towards the calculation required to qualify for this credit.
In all cases, provide daylight redirection and/or glare control devices to avoid high-contrast situations that could impede visual tasks. Exceptions for areas where tasks would be hindered by the use of daylight will be considered on their merits.