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Climate Zones

Refer to N1101.7 (R301.1) Climate Zones for additional information.
FSC Wall Calculator: I-Code Differences
The FSC Steel and Wood Wall Calculator tools provide water vapor control guidance to the user. The technical basis for the water vapor control checks has served as the basis for recent IBC and IRC code editions, including the latest 2024 editions of the IBC and IRC. While the calculator strives for code consistency, it has maintained a more conservative position or provided additional features that are omitted from the codes. The reasoning and relevant building science for each case is outlined below as it relates to the 2021 and 2024 editions of the IBC and IRC.
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