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

units to consider

We are in a project with two different volumes that are joint in the first floor by a footbridge (the first floor of both buildings at the same height). There is nothing under the footbridge (the concrete site hardscape); however, there is a glass-canopy above the glass-footbridge. Are both the footbridge and/or the canopy into the objetive of this credit? If not, are into the objetive of ss_c7.1 because they are covering a hardscape? In one of the buildings, we have a terrace over the roof (the floor of the terrace is 1 meter over the roof of the building so they aren´t in touch). I think the glass of the floor of the terrace isn´t into the objetive of this credit and I should consider the roof under the terrace, am i correct? Finally, I´ve read skylights can´t apply for this credit, why not? Thanks in advance for your time

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Tue, 01/03/2017 - 12:18

Angel: 1) If the footbridge roof is covering outdoor hardscape it would be considered an architectural structure and would be subject to requirements for SSc7.1 Non-Roof. 2) LEED Interpretation ID #5383 specifically addresses a glass canopy. From that ruling, "Yes, the glass canopy can be excluded from SRI roof requirements under SSc7.2 as it covers an unconditioned outdoor space, not a building." However, as stated above, this material would be subject to the requirements of SSc7.1. 3) LEED Interpretation ID #10235 provides clarification on your question regarding skylights. Skylights are considered to be an appurtenance (from the LEED glossary: "a built-in, nonstructural portion of a roof system. Examples include skylights, ventilators, mechanical equipment, partitions, and solar energy panels.") and may be excluded from the applicable roof area used in your calculations.

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