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EQ Credit 8.1: Daylight & Views: Daylight 75% of Spaces
1 Point
Intent
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.
Requirements
OPTION 1 — CALCULATION
Achieve a minimum glazing factor of 2% in a minimum of 75% of all
regularly occupied areas. The glazing
factor is calculated as follows:
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Glazing Height = Window Area [SF] x Window Geometry
x Actual Tvis x
Window Height
Factor Floor Area [SF] Factor
Minimum Tvis
Factor |
OR
OPTION 2 — SIMULATION
Demonstrate, through computer simulation, that a minimum daylight
illumination level of 25 footcandles has
been achieved in a minimum of 75% of all regularly occupied areas.
Modeling must demonstrate 25 horizontal
footcandles under clear sky conditions, at noon, on the equinox, at
30 inches above the floor.
OR
OPTION 3 — MEASUREMENT
Demonstrate, through records of indoor light measurements, that a
minimum daylight illumination level of 25 footcandles has been
achieved in at least 75% of all regularly occupied areas.
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 75% of total area
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.
Potential Technologies & Strategies
Design the building to maximize interior daylighting. Strategies to consider include building orientation, shallow floor plates, increased building perimeter, exterior and interior permanent shading devices, high performance glazing and automatic photocell-based controls. Predict daylight factors via manual calculations or model daylighting strategies with a physical or computer model to assess footcandle levels and daylight factors achieved.
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