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There are a variety of no-cost tools available through the internet that can be used to perform detailed energy calculations:

 
 

Roof Wind Designer

Roof Wind Designer is intended to provide users with an easy-to-use means for determining roof systems’ design wind loads for many commonly encountered building types that are subject to building code compliance.
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Department of Energy (Oak Ridge National Lab)

Allows calculation of insulation performance balanced against roof reflectivity.
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EPA Energy Star

Calculates savings based on use of a reflective roof only. Building is assumed to be air conditioned.
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NRCA ENERGY-Wise

Uses graphical input of roof assemblies to evaluate thermal performance and estimated energy costs 
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Lawrence Berkeley National Laboratory, Heat Island Group

Cool Colors Project. Maintains the cool roofing materials database.
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Other Useful Resources:

National Roofing Contractors Association www.nrca.net

 

Single Ply Roofing Industry www.spri.org

 

Polyisocyanurate Insulation Manufacturers Association www.pima.org

 

EPDM Roofing Association www.epdmroofs.org

 

Asphalt Roofing Manufacturers Association www.asphaltroofing.org

 

International Code Council www.iccsafe.org

 

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