855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 157
Extracted Content
Equation 1. Weighted nonroof or roof calculation
𝐴𝑟𝑒𝑎 𝑜𝑓 𝑛𝑜𝑛𝑟𝑜𝑜𝑓 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑠
-
[𝐴𝑟𝑒𝑎 𝑜𝑓 ℎ𝑖𝑔ℎ-𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑎𝑛𝑐𝑒 𝑟𝑜𝑜𝑓] 0.5 0.75
-
[𝐴𝑟𝑒𝑎 𝑜𝑓 𝑣𝑒𝑔𝑒𝑡𝑎𝑡𝑒𝑑 𝑟𝑜𝑜𝑓] 0.75 0.75
0.75
≥𝑇𝑜𝑡𝑎𝑙 𝑠𝑖𝑡𝑒 𝑝𝑎𝑣𝑒𝑑 𝑎𝑟𝑒𝑎+ 𝑇𝑜𝑡𝑎𝑙 𝑟𝑜𝑜𝑓 𝑎𝑟𝑒𝑎
Projects should evaluate and achieve compliance using Equation 1. If the project does not achieve the standard nonroof or roof calculations, teams may use an SRI and SR weighted average approach to calculate compliance. The weighted nonroof or roof equation weighs the SR and SRI for total hardscape and roof area, showing its overall consequence on heat island effect. This equation is useful for projects that have multiple roof angles, and nonroof or roof materials that fall both above and below the required SR and SRI values.
Equation 2. Weighted nonroof or roof calculation
𝐴𝑟𝑒𝑎 𝑜𝑓 ℎ𝑖𝑔ℎ 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑎𝑛𝑐𝑒 𝑛𝑜𝑛𝑟𝑜𝑜𝑓 𝐴 × [𝑆𝑅 𝑜𝑓 ℎ𝑖𝑔ℎ 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑎𝑛𝑐𝑒 𝑛𝑜𝑛𝑟𝑜𝑜𝑓 𝐴]
(
where :
) 1 0.5
𝑅𝑒𝑞𝑢𝑖𝑟𝑒𝑑 𝑆𝑅
- [𝐴𝑟𝑒𝑎 𝑜𝑓 𝑜𝑡ℎ𝑒𝑟 𝑛𝑜𝑛𝑟𝑜𝑜𝑓 𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑠]
0.5
𝐴𝑟𝑒𝑎 𝑜𝑓 ℎ𝑖𝑔ℎ 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑎𝑛𝑐𝑒 𝑟𝑜𝑜𝑓 × [𝑆𝑅𝐼 𝑜𝑓 ℎ𝑖𝑔ℎ 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑎𝑛𝑐𝑒 𝑟𝑜𝑜𝑓 𝐴]
- (
) 2 0.75
𝑅𝑒𝑞𝑢𝑖𝑟𝑒𝑑 𝑆𝑅
- [(𝐴𝑟𝑒𝑎 𝑜𝑓 𝑣𝑒𝑔𝑒𝑡𝑎𝑡𝑒𝑑 𝑟𝑜𝑜𝑓)] ≥ 𝑇𝑜𝑡𝑎𝑙 𝑠𝑖𝑡𝑒 𝑝𝑎𝑣𝑖𝑛𝑔 𝑎𝑟𝑒𝑎+ 𝑇𝑜𝑡𝑎𝑙 𝑟𝑜𝑜𝑓 𝑎𝑟𝑒𝑎
0.75
-
Summed for all high reflectance nonroof areas
-
Summed for all high reflectance roof areas
Option 2. Parking Under Cover
Unshaded parking areas have become small urban heat islands as most outdoor parking lots use dark colored impervious surfaces, such as asphalt or concrete pavements with low SR value. When parking is under cover, it significantly reduces the exposed hardscape area and minimizes the heat island effect. Covered parking strategies include placing parking underground, underdeck, under roof, or under the building.
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 147