For a 6:12 roof with eaves that extend 30 horizontal inches from the eave line, which of the following would best be the width of ice dam protection?

The correct choice reflects the recommended guidelines for the width of ice dam protection based on the specifics of the roof's pitch and eave extension. For a roof that has a pitch of 6:12, it is inclined steeply, leading to a greater likelihood of ice dam formation during winter. The eaves extend 30 inches, which is significant and requires adequate ice dam protection to prevent water backup.

Typically, for roofs with steeper pitches, it is advised to extend ice dam protection further than the horizontal distance of the eave extension. A common rule is to cover at least the horizontal distance of the eaves plus an additional width to account for potential ice build-up. Therefore, the combination of the horizontal eave extension and the recommended additional coverage aligns with the option that suggests 54 horizontal inches. This extra coverage helps ensure that the ice and melting snow have a secure area to drain without causing damage due to water intrusion.

Understanding this context is critical for determining the appropriate level of protection for roofs in colder climates, especially for those with more pronounced pitches and extended eaves.