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R702.7.1 Spray Foam Plastic Insulation for Moisture Control With Class II and III Vapor Retarders

Residential Code 2021 of Colorado > 7 Wall Covering > R702 Interior Covering > R702.7 Vapor Retarders > R702.7.1 Spray Foam Plastic Insulation for Moisture Control With Class II and III Vapor Retarders

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For purposes of compliance with Tables R702.7(3) and R702.7(4), spray foam with a maximum permeance of 1.5 perms at the installed thickness applied to the interior side of wood structural panels, fiberboard, insulating sheathing or gypsum shall be deemed to meet the continuous insulation moisture control requirement in accordance with one of the following conditions:

The spray foam R-value is equal to or greater than the specified continuous insulation R-value.
The combined R-value of the spray foam and continuous insulation is equal to or greater than the specified continuous insulation R-value.

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R702.7.1 Wall Covering, Spray Foam Plastic Insulation for Moisture Control With Class II and III Vapor Retarders

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Building Code of the Department of Personnel & Administration/Office of the State Architect (DPA/OSA) > 14 Exterior Walls > 1404 Installation of Wall Coverings > 1404.3 Vapor Retarders

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Building Code of the Department of Personnel & Administration/Office of the State Architect (DPA/OSA) > 14 Exterior Walls > 1405 Installation of Wall Coverings > 1405.3 Vapor Retarders