The UL tests under which code evaluate a roof covering's behavior against intermittent flame exposure?

UL 790 is the correct standard as it specifically addresses the fire test for roofing materials which evaluates a roof covering's ability to resist ignition and the spreading of flame over its surface when exposed to intermittent flame. This testing ensures that roofing materials can effectively withstand fire hazards that may occur, such as those from nearby structures or outdoor activities that could generate flames.

This standard is crucial in determining how well roofing materials perform in fire situations, providing essential safety information for builders, contractors, and consumers when selecting roofing products. The results of the UL 790 test help assess compliance with building codes and safety standards that aim to protect property and lives from fire hazards.