The American Iron and Steel Institute has published AISI S250-21, North American Standard for Thermal Transmittance of Building Envelopes With Cold-Formed Steel Framing, 2021 Edition, as a single source for calculating the thermal transmittance of walls and ceiling/roof envelope assembles that contain cold-formed steel framing. The standard is intended for adoption and use in the United States, Canada and Mexico and is available for free download at www.aisistandards.org. AISI S250-21 was developed to eventually supersede the many methods currently found in various energy codes and standards, most of which are limited to calculating wall assemblies at 16 or 24 inches … Read more