How Big Does Hail Have to Be to Damage a Roof?

Hailstones start to pose a real threat when they reach about one inch in diameter, roughly the size of a quarter. At that size, they can bruise asphalt shingles, crack clay tiles, or dent metal flashing. The damage may not be visible from the ground, but it can weaken the roof's protective layer.

Once hail reaches two inches or more, the risk of serious damage rises sharply. Large hailstones can puncture membranes, break through older shingles, and knock granules off asphalt. Wind-driven hail is even more dangerous, as it strikes at an angle and can lift shingle edges or pry up flashing.

After a hailstorm, inspect your roof from the ground with binoculars. Look for missing granules on asphalt shingles, which appear as bare spots. Check for cracks in tiles, dents in metal, or any spots where the underlayment is exposed. Also look for broken or displaced shingles.

Inside your home, watch for water stains on ceilings or walls, which may appear days or weeks later. Check your attic for damp insulation or daylight coming through the roof. If you see any signs, act quickly to prevent water damage from spreading.

You cannot control the weather, but you can prepare your roof. If your roof is nearing the end of its lifespan, consider replacing it with more impact-resistant materials, such as impact-resistant shingles or metal roofing. Trimming overhanging branches can reduce the chance of falling debris during a storm.

After a significant hailstorm, even if you see no damage, schedule a roof inspection. Small cracks and punctures can worsen over time, leading to leaks and water damage. Early detection saves you from larger repairs down the road. If you notice any issues, contact local water damage pros to assess and mitigate the problem.