In clay and concrete roof tile installation, what is the minimum flashing end lap requirement?

In clay and concrete roof tile installation, the minimum flashing end lap requirement is correctly specified as 4 inches. The purpose of this end lap is to ensure a proper seal that prevents water from infiltrating the roof structure at the joints of the flashing. A lap of 4 inches provides sufficient coverage to direct water away from potential leak points and allows for some adjustment due to thermal expansion and contraction of materials. Additionally, this measurement is aligned with industry standards that promote effective water management and safeguard the integrity of the roof assembly.