Dear All,
Option 2 of this credit requires that parking shading surfaces must have minimum SRI of 29, be a vegetated green roof OR be covered by solar panels.
In our project, we are building shading structures that are 70% by area covered by PV panels. Rest of the surface is metal roof. Do you think this metal roof should also satisfy the SRI>29 rule?
Jacob Arlein
Director of Energy ServicesEnvironmental Building Strategies
64 thumbs up
July 13, 2010 - 11:46 am
It depends on the color of the metal roof. A light colored metal roof will likely qualify as an SRI value greater than 29, a dark colored metal roof likely will not. For more information on specific products go to http://www.coolroofs.org/products/search.php and you can search for your specific products. You can also download a calculator that generates an SRI value based on solar reflectance and thermal emittance here: http://www.coolmetalroofing.org/elements/downloads/SRIcalc9.xls.
Omer Moltay
Co-founderMimta EcoYapi
201 thumbs up
July 15, 2010 - 10:22 am
Thanks for the reply.
Does the project need to use specifically these products given on the www.coolroofs.org webpage? We do not want to import metal roof sheets from the US, since we can easily find light colored metal roofs or coat them after installation (project is located in Istanbul). However, I really doubt that the manufacturer would have a cut sheet stating solar reflectivity and thermal emissivity.
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11474 thumbs up
July 19, 2010 - 3:17 pm
Omer, you are not limited to products from the coolroofs.org page, but you do need to use products that can demonstrate with solid data that they meet the SRI specs. You could consider getting the local products there tested, for example.