Weighted average SRI values for option 2 parking under cover

For Option 1. Nonroof and Roof SRI and SR weighted average approach may be used to calculate compliance. The LEED Reference guide provides examples of roof and nonroof strategies, you can use any combination.

For Option 2 you only have to provide Material Description, SRI, and Initial or 3-Yr Aged Value for Parking Spaces covered by roof. If you look at the LEEDonline form for the credit you'll note that for all other covered parking space types (under vegetated roof, underground, etc) you just list the number of spaces.

The July 2022 Addendum says ""Any roof used to shade or cover parking must (1) have an aged SRI of at least 32 (if aged SRI information is not available..." so I would interpret that to also include weighted average SRI. In fact when you input the values in the calculator, what you get is the weighted average.

I think I understand Julio's question...here's my similar project approach that was awarded for both Options:

We had an underground parking garage partially under the building and partially covered by ground-level outdoor space with hardscape and landscaping features. We treated the building roof as normal roof area, and treated the ground-level area that covered the garage as normal site calcs (not roof reflectance goals), which enabled normal product selection for varied paving/plant options.

Does that help?

I think all of your questions above may be answered by actually seeing the Credit Form that will go with your documentation, and plugging in your takeoff and reflectance values. If your project is registered in LEED Online, it will be on the Credits page, under this Credit heading, then in the Form button.

If the project hasn't been registered yet, you can use a sample form to see what we mean. This link should take you straight to this credit's page in the online Credit Library. Scroll to the bottom right, and you'll be able to download a sample form. Use the Active Form version. 

Once you plug your numbers into the form, you'll be able to play with your reflectance values to see what will actually be needed of your areas in question in order to still meet the thresholds. The weighted calcs in the forms automatically calculate for you, so you'll have a clearer idea of what areas must meet which reflectance values. In many projects, you can still earn Opt 1, even if you have some areas that don't meet the values identified in the guide--this is the weighted calc effect. For Opt 2, if you have less than 100% of your parking spaces under cover, the same seems to apply, if I understand your question and the form functionality correctly. 

My projects usually have reflectance goals, but can't always meet the minimums listed in the guide. Depending on the project, and due to the weighted calc, many are still able to meet the requirements. I always plug my number in the form to check our assumptions as a sanity check.