HAIL – While hail storms tend to be relatively short, and rarely last for longer than 15 minutes, hailstones can leave dents or pockmarks in shingles and knock shingle granules loose. This can be problematic because these granules help protect your roof against rain and sun damage. Hail damage can also ruin the pleasing aesthetic appearance of your roof’s surface.
WIND – Hurricane-force winds, which are classified by meteorologists as 74 mph or greater, or gale-force winds, which are between 39-54 mph, can cause visible damage to your home’s roof. High winds can remove or tear shingles, leaving the underlayment, roof deck, or waterproofing material exposed to the elements.
During less severe storms, sudden, sharp gusts of wind can lift and curl shingles. When shingles are installed, they’re purposefully overlapped to create a water-tight seal, and this lifting and curling can break this seal, potentially leaving your roof vulnerable to damage from wind-driven rain.
STANDING WATER – Roofs without proper drainage can experience problems with standing water after big rainstorms, especially in uneven areas. Clogged gutters can also cause backed up rainwater under your shingles, which allows moisture to potentially penetrate the underlayment or the roof deck.
DEBRIS – Large objects can dent or impact the surface of the shingle, leaving that area of the roof vulnerable to moisture intrusion, whereas lighter branches may not be as much of a problem.