Illinois Roofing Practice Exam

The correct choice highlights an essential factor for the successful application of Spray Polyurethane Foam (SPF). When SPF is applied, the temperature of the deck, which is the surface being covered, plays a critical role in ensuring proper adhesion and curing of the material. If the deck temperature is kept above 50° Fahrenheit, it allows the SPF to properly expand, bond, and cure effectively. This optimal temperature range helps prevent issues such as poor adhesion, which can lead to diminished performance or even failure of the roofing system.

In contrast, applying SPF in temperatures below freezing or only under high humidity could lead to complications like improper curing or moisture-related issues. Additionally, using SPF without considering temperature could result in significant problems, such as the foam not adhering properly to the substrate. These factors reinforce the importance of monitoring temperature conditions when applying SPF for the integrity of the roofing installation.