// CODE SNIPPET
A9.4.1 Air Films
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Prescribed R-values for air films shall be as follows:
|0.17||All exterior surfaces|
|0.46||All semi-exterior surfaces|
|0.61||Interior horizontal surfaces, heat flow up|
|0.92||Interior horizontal surfaces, heat flow down|
|0.68||Interior vertical surfaces|
Exterior surfaces are areas exposed to the wind.
Semiexterior surfaces are protected surfaces that face attics, crawlspaces, and parking garages with natural or mechanical ventilation.