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1404.3.1 Class I and II Vapor Retarders
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Class I and II vapor retarders shall not be provided on the interior side of frame walls in Zones 1 and 2. Class I vapor retarders shall not be provided on the interior side of frame walls in Zones 3 and 4 other than Marine 4. Class I or II vapor retarders shall be provided on the interior side of frame walls in Zones 5, 6, 7, 8 and Marine 4. The appropriate zone shall be selected in accordance with Chapter 3 [CE] of the International Energy Conservation Code-Commercial Provisions.
Exceptions:
- Basement walls.
- Below-grade portion of any wall.
- Construction where moisture or its freezing will not damage the materials.
- Conditions where Class III vapor retarders are required in Section 1404.3.2.