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NC-2009 SSc7.1:Heat Island Effect—Non-Roof

Tree canopy

We are using the shadow of the trees canopy to comply with the credit. When calculating the average shadow of three times a day, part of this is outside the site boundary. Should we consider the lenght of it also outside the site for the calculation? Or only average the parts of the shadow inside the site?

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Profile picture for user crissy_1
Crissy Tsai
Sustainability Coordinator
Webcor Builders
LEEDuser Basic Member
40 thumbs up

Fri, 12/28/2012 - 01:22

Carolina, I haven't used the shadow of the tree canopy method in a while, so I'm not positive if this response is correct. I would think that you should use the average parts of the shadow inside the site.

Wed, 01/02/2013 - 14:18

Thank you Crissy! I'm wondering if we should also exclude the parts of the shadows inside the landscape for the average calculation... Did anyone have this kind of issue using this method?
Profile picture for user tristanroberts
Tristan Roberts
Representative
Vermont House of Representatives
LEEDuser Expert
7780 thumbs up

Fri, 03/22/2013 - 15:41

Carolina, I'm a little confused. I don't think you can take credit for shading that occurs outside your LEED boundary, but I'm not sure if that was your question.
Profile picture for user lawrencelile
Lawrence Lile
Chief Engineer
Lile Engineering, LLC
LEEDuser Basic Member
59 thumbs up

Fri, 04/10/2015 - 15:36

If I understand the question correctly (not sure I do) shadows outside the LEED boundary don't affect you one way or the other. Shadows within the leed boundary that fall on hardscape do help you. Shadows within the LEED boundary that fall on non-hardscape don't affect the calculation one way or the other. It is the percentage of hardscape area within the LEED boundary that is shaded that is important.
Profile picture for user paulb_1
Paul Bierman-Lytle
Executive Director of Technical Services
Paladino and Company
LEEDuser Basic Member
3 thumbs up

Wed, 06/10/2020 - 13:16

What is the canopy diameter of a tree for use in calculating Heat Island Reduction, i.e. shading of nonroof surfaces? Is the diameter taken at 3-year growth, 5-year, 10-year, etc.? Makes a big difference.  

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