A new equation to calculate credit compliance has been added. Base on a weighted average you now may also show credit compliance. Find the new equation here: https://www.usgbc.org/ShowFile.aspx?DocumentID=9757 Also appurtenances can be deducted form the roof area and are now more clearly defined as: "An appurtenance is any built-in, nonstructural portion of a roof system, such as skylights, ventilators, mechanical equipment, partitions, and solar energy panels." Roof area is now more clearly defined too: "Roof area is the area of the uppermost surface of the building which covers enclosed Gross Floor Area, as measured when projected onto a flat, horizontal surface (i.e. as seen in Roof Plan view). ‘Roofs’, or portions of roofs, covering unenclosed areas (e.g. roofs over porches and open covered parking structures) are not included in the areas used to evaluate compliance with SSc7.2, though they may be applicable to SSc7.1."

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Tristan Roberts

Representative

Vermont House of Representatives

LEEDuser Expert

7780 thumbs up

Wed, 12/14/2011 - 20:16

With the help of Susann at HSB and our content partners at YRG, LEEDuser has posted an updated verison of our popular Roof Weighted Average Calculator. Members can acess this spreadsheet calculator in the Doc Toolkit above.

Steven Er

LEEDuser Basic Member

8 thumbs up

Wed, 04/18/2012 - 09:12

New definition of roof area defines the area of the uppermost surface of the building which covers enclosed Gross Floor Area (GFA). I have a situation here.There is trellis/pergola with cover located on top of the roof (uppermost surface which covers enclosed GFA) of the building. Is the upper surface of this trellis/pergola considered as roof in this credit since it covering unenclosed area? If not, is the roof that under this trellis/pergola is required to be considered as roof in this credit? Is anyone come across this situation?

Samantha Harrell

LEED Project Reviewer certificate holder

LEEDuser Basic Member

76 thumbs up

Thu, 04/19/2012 - 15:45

Hi Steven, LEED Interpretations 3109 and 1441 state, respectively, that a canopy (covering part of the roof area) is effectively part of the roofing system as it relates to reflectivity and should be included in calculations for this credit; and, roof design, including associated architectural features, contributes in varying degrees to heat island effect. While permanent shading of direct solar gain meets the intent of SSc7.2...the shading device is effectively part of the roofing system as it relates to reflectivity. This also extends to architectural features. Apply credit requirements to the area of non-shaded weather protection combined with the area of the metal grating and architectural feature.

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FAQs about SSc7.2 :

New equation and better definitions - Addenda August 2011

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