How is the Hazardous Glass Area (HGA) calculated for each material? Is a material with a higher threat factor weighted the same as a material with a lower threat factor?

Any help regarding the reuse of an existing building LEED simulation would be helpful. We are working on an existing building that was a warehouse and is now an office building.

Hi My project site is composed of sand,gravel. How do I define the run off coefficient? Where can I get it? I'm not experienced enough to work LEED project. Might be a poor question..sorry.

I am filling out the pre-requisite template for our LEED 2009 CI project. There are only 2 Break Room Sinks for the project.

I would love some insight on why, if going for Option 3, the whole-building water and energy usage data reporting MUST be done by a Third Party Data Source, vs. the actual Owner?

Are steel coils counted as recovered for this credit? I have several products where steel coils are used. Does this count?

Hi, We are commissioning a building that will be connected to a DES that was completed in 2012, so it is considered "new".

Hi everyone! We are working on previously undeveloped land project, which apply for case 1 “site with existing imperviousness 50% or less”.

I'm working on a project where the existing site is 100% concrete paving. We are not providing any landscape, thus no irrigation. Does this mean we comply with option 2?

Is rockwool considered a rapidly renewable material? I understand that rapidly renewable materials must be made from either plants or animals and must have a harvest cycle of 10 years or less.