Flashings will extend how many inches up vertical surfaces and roof decks?

Flashings are crucial components in roofing and exterior wall systems, designed to direct water away from critical areas and prevent leaks. The standard practice for flashings is to extend at least 4 inches up vertical surfaces and roof decks. This height is important for ensuring that water does not seep behind the flashing, which could lead to water damage, mold issues, or the deterioration of the building materials.

The 4-inch guideline is derived from industry standards and building codes, which prioritize effective water management and the integrity of structures. By extending the flashing to this height, it creates a more reliable barrier against moisture intrusion. This is particularly important in areas with heavy rainfall or snow, where water runoff and accumulation can put added pressure on the seal between the roof and vertical surfaces.

Inadequately extending flashings can lead to vulnerabilities, so the 4-inch minimum is a best practice that ensures effective performance of the flashing system in protecting the building envelope.