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Prescribed R-values for air films shall be as follows:
R-Value Condition
0.17 All exterior surfaces
0.46 All semiexterior surfaces
0.61 Interior horizontal surfaces, heat flow up
0.92 Interior horizontal surfaces, heat flow down
0.68 Interior vertical surfaces
A9.4.1.1
Exterior surfaces are areas exposed to the wind.
A9.4.1.2
Semiexterior surfaces are protected surfaces that face attics, crawlspaces, and parking garages with natural or mechanical ventilation.
A9.4.1.3
Interior surfaces are surfaces within enclosed spaces.

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