NRCA has updated its EnergyWise Roof Calculator Online, which determines roof assemblies' minimum thermal insulation requirements and heating and cooling costs applicable to specific low-slope roof assembly designs. The update incorporates the latest revisions to the model energy codes and energy-efficiency standards.
If you are involved in designing and specifying low-slope roof assemblies, you should be aware of EnergyWise's latest revisions.
EnergyWise was developed in 1998 as a CD-based version of The NRCA Energy Manual, originally published in 1977. Using the first version of EnergyWise, users could graphically construct roof assemblies and evaluate their energy efficiencies using the 1989 edition of ASHRAE 90.1, "Energy Efficient Design for New Buildings Except Low-Rise Residential Buildings," as a baseline.