The answer to 'why is my roof decking hail damage' is that hail impact can cause significant damage to the plywood or OSB sheathing that forms the roof decking beneath your shingles. Hailstones, even small ones, can create dents, cracks, and holes in the roof decking, compromising its structural integrity and ability to properly support the roof system.
Hail damage to the roof decking is often accompanied by visible damage to the shingles above, such as cracked, broken, or missing shingles. Over time, the damaged decking can lead to leaks, water intrusion, and further deterioration of the roof. Addressing hail damage to the roof decking is crucial to prevent more serious and costly problems down the line.