Action Steps

Confirm glare control exists for each window.

More natural light is transmitted through glazing with higher VLT values, but a higher VLT value tends to correlate with a higher solar heat gain coefficient (SHGC). Assess the optimal balance of these values, along with

Take the VLT of the whole window, not just the glazing, to account for shading from mullions.

For Option 1, find out the Visual Light Transmittance (VLT) value of the glazing and enter it on the LEED EQc8.1–8.2

Identify the glazing type within each regularly occupied space. The LEED Reference Guide includes a helpful figure (p. 374) and chart of daylighting design criteria (p. 375) to help determine glazing type. The possible glazing types identified by LEED include the following:

Run prescriptive design calculations to verify that the required percentage of regularly occupied areas meets the required levels for credit compliance. Use the LEED EQc8.1–8.2

Identify the regularly occupied spaces and their square footage.

Integrate glare control into the design.

Explore a combination of daylight strategies such as open space planning techniques, glazing selection, lightshelves and more.

Choose a LEED compliance path to verify that the daylighting meets a minimum glazing factor of 2% for at least 75% of all regularly occupied spaces or a minimum of 25 footcandles for at least 75%of regularly occupied spaces. If 95% of regularly occupied spaces meet the credit requirements, a project can earn an point via IDc1 for Exemplary Performance.