Goal
Reduce contribution to localized increased air temperatures due to pavement
reflectance and minimize stormwater runoff temperatures.
Requirements
Use a pavement surface with a minimum albedo of 0.3 (measured using ASTM E 903)
for a minimum of 50% of the total project pavement surfacing by area.
OR
Use a porous pavement or pavers for a minimum of 50% of the total project pavement
surfacing by area.
In either case, the surfaces intended for use by vehicles (e.g., roads, parking lots) must
all be included in the calculation. Other surfaces (e.g., sidewalks) may be included if
desired. A combination of materials may be used to meet the 50% area requirement.
Documentation
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Comment on credit PT-4
Addressing NPS comments by BG:
Agreed that NPS would probably not have any interest in pursuing this credit for the reasons you list. I like the red surface treatment in Zion. :-)
Transparent water based acrylic was tested as an aggregate binder replacing asphalt and the results were very promising.I think this also may be a very effecient type of cool pavement.
PT-4
General Comment:
As per comment number 13 above (Permeable Pavement), very small percentages of National Parks are in pavement; therefore the paved surfaces in Parks do not act as heat sinks as vast amounts of pavement in urban areas might. As per the discussion on pages 5and 6 of this Section, asphalt pavement fades over a few years, and in many Park situations, roads are in wooded areas and have some amount of shade due to the fact that Park roads are designed to limit resource impacts.
NPS-BG
PT-4
General Comments to this Section:
Park Service doesn’t have much in the way of concrete pavements, and considering the costs, it is unlikely that we would swap out an asphalt road or parking area for concrete.
NPS-BG
PT-4
General Comment:
5 points seems high for this Section, as even if the road was done in asphalt, it would lighten quickly and then provide the same “cool pavement” benefit of concrete pavement.
NPS-BG
PT-4
General Comment:
Some Parks have used lighter - colored aggregates, but mostly to provide a historic look. Lighter – colored stone may be a possibility if such stone is locally available, and if the Park agrees with the look that it may provide. The NPS has also experienced problems with the removal of the liquid asphalt by shot-blasting – whereby the color of lighter-colored aggregates are exposed, so asking for lighter aggregates isn’t foolproof, or necessarily cost-effective.
NPS-BG
Greenroads Manual Version 1.0 Review
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