Roof system designers are responsible for ensuring their designs comply with applicable codes and standards. For commercial building projects, ASHRAE 90.1, "Energy Standard for Buildings Except Low-Rise Residential Buildings," often is an option for roof system designers to demonstrate compliance with applicable energy-efficiency requirements.
In 2016, ASHRAE 90.1-2016 was published and includes updated requirements of which building and roof system designers should be aware.
Because ASHRAE 90.1 is an option for energy code compliance for commercial buildings in most U.S. jurisdictions, roof system designers should be familiar with its roof system-related provisions. ASHRAE 90.1 contains mandatory requirements that apply to all commercial buildings and offers a choice between complying with performance- or prescriptive-based criteria.