Forum discussion

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

exempted area from SSc7.2

Hi all, our office building has a roof area that consists of some functional, usable spaces. In detail this area will be used as playground for children and as chill out area for office's employees. Could this areas be deducted from the total roof surface area ( as I do for mechanical equipment?). Thanks.

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Mon, 05/13/2013 - 00:37

Mario, I could see an argument being made for this, but in my opinion, no. It's very common to have functional space on roofs, but this is not mentioned in LEED as an excludable space, and I haven't seen this question come up before. Also, just as non-roof hardscape, including pedestiran-oriented hardscape, is counted in the nonroof credit, it seems that space of this nature should be counted in the roof credit.

Mon, 05/13/2013 - 07:37

Thanks Tristan. We have recently found a Leed Interpretation saying: "Roof area that consists of functional, usable spaces- such as helipads, recreation courts, and areas covered by equipment, solar panels, and appurtenances- can be exempted from the roof calculations for SSc7.2. Projects are not eligible for SSc7.2 if the exempted spaces encompass the entire roof area. Applicable Internationally." In my opinion, functional and usable spaces can be exempted, considering that a high SRI value makes the roof area impossible to use due to the glare. What's your opinion?

Mon, 05/13/2013 - 13:51

Mario, you are correct. I should have revisited that LI before posting my earlier response. I agree you can exclude the space.

Wed, 11/27/2013 - 15:16

Mario, Tristan, does this mean that wide paved area (wooded flooring) acting as a chill-out area for building users can be excluded of the total relevant roof area for this credit? Thanks for any kind of help.

Thu, 11/28/2013 - 08:18

Hi all. I will ad up my opinion to Petr's comment... If yes, then it is up to Design team to decide what brings the most outcome from such use of the roof... energy savings by reflective surface (or local microclimate temperature rise which affects surrounding buildings as well), or user comfort... In my opinion this interpretation allows for "chasing points" if used widely without setting in a wider context. I would say it should be applied for projects where a point for SSc5.2 has been awarded which wouldn't be possible without this kind of roof usage. That would make more sense to me... Opinions? :-)

Fri, 12/20/2013 - 23:39

Petr Vogel—I agree.Petr Lhotak—I do see how this can lead to creative interpretations of the credit, but that's how it's written.

Wed, 07/26/2017 - 10:09

Tristan, based on the LEED interpretation that recreational courts can be excluded from the Roof area calculation, would this mean that terraces which are being designed as recreational space for the building tenants therefore also be excluded from the roof calculation? It notes above that terraces and balconies must be included but if these spaces are being designed for recreation should these also be excluded?

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