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AISI D250-23 was prepared to assist the user of AISI S250-21 w/S1-22, North American Standard for Thermal Transmittance of Building Envelopes with Cold-Formed Steel Framing, 2021 Edition with Supplement 1, 2022 Edition to calculate the thermal resistance of building envelope assemblies containing cold-formed steel framing. This design guide provides a general discussion about the national model codes of the United States and Canada, a general review of the basic principles of thermal dynamics of a building envelope, thermal design examples covering wall and roof assemblies constructed using AISI S250, a method to address custom or proprietary cold-formed steel wall framing, and thermal design examples covering floor assemblies constructed over unconditioned spaces using the ICC International Energy Conservation Code, 2003 edition.
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