What is the minimum ambient temperature for SPF roof installation?

The minimum ambient temperature for SPF (Spray Polyurethane Foam) roof installation is 2 degrees Fahrenheit above the dew point. This temperature ensures that moisture does not condense on the substrate during the application process. If the temperature is at or below the dew point, it can lead to issues such as improper curing of the foam, adhesion problems, or the formation of bubbles and blisters due to trapped moisture.

Having the ambient temperature set at 2 degrees Fahrenheit above the dew point creates a margin that is typically sufficient to prevent condensation while allowing the SPF to fully expand and adhere properly to the substrate. This specification is essential for ensuring the durability and effectiveness of the roof system being installed.

The other temperature options provided all suggest varying degrees of separation from the dew point but do not align with the guidelines established in industry practices for SPF application, making them less optimal for successful installation.