Crushed Gravel SRI?

I found an SRI for limestone pavers of 62 from the Natural Stone Council, but I don't know about crushed gravel, and I wasn't able to find anything online. I will keep looking around, and please post back here if you find an answer.

Not sure if this is specific enough, or if USGBC will buy it, but here's a report with limestone SRI: http://www.concretethinker.com/Content/Upload/446.pdf

I was searching for the SRI of bluestone as well. While at Build Boston 2010 I posed the question to a guy in the stone trade. He gave me an SRI of 18.2 for bluestone. Hope that helps.

The only thing I can find is using the SRI value in SSC7.2 for a gravel ballast. In Table 1, a light gravel on a built-up roof has an SRI of 37. Also, gravel is used in making concrete, so maybe an SRI of 35 is playing it safe. Any other ideas?

Hi everyone,
I was just wondering if crushed gravel couldn't be considered as pervious paving and account for this credit, even though is not vegetated.

Any thoughts?

Dear Nadia,
I'm having the same thoughts. There is no continuous hard layer under the gravel, i suppose the water could just filter in. Does anyone have any experience with this?

Nadia and Adrienn, it depends on how the gravel surface is engineered to work. As I noted earlier, most gravel roadways are basically impervious. However, if this is crushed gravel over a subsurface layer designed to be infiltrated, and the gravel is not going to be compacted by vehicle traffic (or it is engineered to withstand that, then it might be considered pervious.A separate question is whether crushed gravel would really meet the intent of this credit as "open-grid paving." I have doubts about that, if you compare crushed gravel to what most open-grid paving looks like.

According to our engineers, gravel paving is impervious.