A fracture caused by hailstone impact starts at which surface of the shingle?

The fracture caused by hailstone impact begins at the top surface of the shingle, where the hail makes direct contact. When hailstones strike, they create a concentrated force on the upper layer of the shingle, leading to a break in that surface.

Understanding the mechanics of the impact is crucial; hailstones can vary in size and weight, and when they collide with the roof, the energy is transmitted through the top layer first. This impact can lead to a rupture or fracture that often propagates downward, affecting the underlying materials but initiating at the uppermost surface.

This phenomenon emphasizes the importance of roofing material inspections after severe weather events. Home inspectors need to be aware of this kind of damage, as it can severely compromise the integrity of the roofing system if left unrepaired.