What does unbound mean? How is unbound determined?
Does unbound refer to the % openings in the pavers or the void space in the stone below? Generally, the stone below a paver section has no more than 40% voids.
If it is the stone below, how will the unbound area be verified?
Jonathan Weiss
Jacobs Buildings & Infrastructure215 thumbs up
August 26, 2020 - 1:39 pm
Any news on this credit?
emily reese moody
Sustainability Director, Certifications & ComplianceJacobs
LEEDuser Expert
454 thumbs up
August 26, 2020 - 1:53 pm
No idea, but something I need to know as well. Looks like we'll need to inquire with LEED Coach and see what they say.
emily reese moody
Sustainability Director, Certifications & ComplianceJacobs
LEEDuser Expert
454 thumbs up
April 5, 2024 - 7:02 pm
Reposting a response here that was essentially the same question under the regular NC forum page for this credit:
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."
To determing the % of unbound, 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?