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CS-v4 SSc5:Heat island reduction

Open-Grid Pavement 50% Unbound? How to Calculate?

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Marine Petrosyan
Project Manager
Energy Systems LLC
LEEDuser Basic Member
0 thumbs up

Hi, Team!

Can you please help me understand, how the 50% unbound is calculated for the open-grid pavement? 

I know the guideline does not provide the methodology, and I am mostly relying on your particular experience. 

Thank you in advance!

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emily reese moody
Sustainability Director, Certifications & Compliance
Jacobs
LEEDuser Expert
469 thumbs up

Fri, 04/05/2024 - 22:44

Putting this back on the radar to see if anyone has had to do this... I've always relied on my civil engineer or landscape architect to advise; it could just be coincidence that our projects did not have 50% unbound (according to them), so we never have had to look any further at it. Based on the definition in the Guide: 
"open-grid pavement system pavements that consist of loose substrates supported by a grid of a more structurally
sound grid or webbing. Pervious concrete and porous asphalt are not considered open grid as they are considered
bounded materials. Unbounded, loose substrates do not transfer and store heat like bound and compacted materials
do."
I wonder if you could take a sample calc from an example area large enough to determine a % that would apply to your whole SF proportionally?

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