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FAQs about SSc7.2 :

We don't have enough SRI-compliant roofing to earn the credit, but we have a lot of relatively high-SRI roofing (SRI 70). Is there any way to earn the credit?

We don't know the SRI value of some roofing materials we are using. What should we do?

What do I do about roof area covered by solar panels, skylights, space for occupants, helipads, etc.?

Speaking of appurtenances, there is a rooftop pool. Should that be included? Do I need to figure out the SRI value of water?

Do balconies and terraces need to be counted towards the roof square footage?

How does one calculate the square footage of a pitched roof?

What type of ongoing maintenance of the roof is required?

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NC-2009 SSc7.2:Heat Island Effect—Roof

Gravel as a part of green roofs

Hi! We are working on a project that has a large green roof. Some parts of it are covered with gravel (crushed stone) as a surface to walk on. The gravel is on top of the same green roof system as the vegetation, only the top layer is the stone instead of vegetation. Do we count this as part of the green roof? Thanks for any advice you can give!

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Thu, 02/27/2014 - 20:09

Yes, you do count the gravel. No, I don't know what the SRI of gravel is but my working assumption is that it will not meet the SRI requirements. (As i recall it has to do with the shadows the gravel casts.) We've been specifying compliant pavers instead.

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