Welcome to EnergyWise Roof Calculator
EnergyWise Roof Calculator Online is a Web-based application that provides a graphical
method of constructing roof assemblies to evaluate thermal performance and estimated
energy costs under normal operating conditions.
This application also provides minimum insulation requirements as stipulated in
the following codes and standards:
- International Energy Conservation Code (IECC), versions 2006 and 2009
- American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE)
Standard 90.1, "Energy Standard for Buildings Except Low-rise Residential
Buildings," versions 1999 (2001), 2004, 2007 and 2010
- ASHRAE Standard 189.1, "Standard for the Design of High-Performance Green Buildings,"
Click here for additional information about IECC, ASHRAE 90.1 and ASHRAE 189.1
Because this application is intended to be a simplified guide, complex energy calculations,
such as solar heat gain and exterior shading considerations, have intentionally
not been included. For complex energy evaluation calculations, including evaluations
of the entire building envelope, building usage, or changes to heating and air-conditioning
equipment, consult the ASHRAE Fundamentals Handbook or an experienced mechanical
This application determines "Annual Energy Cost" values, which is useful when comparing
the energy costs and savings associated with various roof assemblies' designs. This
value should not be confused with the building owner's overall energy costs, which
in most instances will be somewhat larger than the "Annual Energy Cost" that is
attributable to the roof assembly only. For a detailed financial analysis of the
long-term costs and potential savings of an energy-efficient roof system, consult
an experienced accountant.
Questions regarding EnergyWise Roof Calculator Online can be directed to the Contact Us page.
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