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Hail Damage to Commercial Flat Roofs: Signs and Repair Process

Last updated October 25, 2026

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The short answer

Common Hail Damage Signs

After a hailstorm, check the roof surface for visible dents, tears, or punctures. On built-up roofs, look for loose gravel or granules that have washed into drains or gutters, which can signal membrane damage. On single-ply membranes like TPO or EPDM, hail may create small holes or cracks that are not obvious from the ground.

Inside the building, watch for water stains on ceilings, walls, or near HVAC units. Hail damage can also weaken seams or flashings, leading to slow leaks that show up days later. If you notice any of these signs, plan for a thorough roof inspection before more water gets in.

  • Dents or creases in metal flashing or copings
  • Tears, punctures, or cracks in the membrane
  • Loose or missing gravel on built-up roofs
  • Water stains on ceilings or walls inside
  • Soft or spongy areas when you walk the roof
  • Granules or debris clogging roof drains

Why Prompt Action Matters

Hail damage can compromise the roof's waterproofing even if the leak is not immediate. Small punctures allow water to enter the insulation and deck, leading to rot, mold, and structural issues over time. In a commercial setting, a hidden leak can disrupt operations and damage inventory or equipment.

The longer water sits, the more extensive the repair becomes. Damp insulation loses its R-value, and drywall or ceiling tiles may need replacement. Acting quickly after a storm helps contain the damage and keeps repair costs more manageable, though final costs depend on the roof type and extent of harm.

Inspection and Documentation

Before any repair work, have a professional inspect the entire roof, including seams, flashings, and penetrations. They will identify all hail impact points, not just the obvious ones. Use photos and notes to document the damage, which can help if you file an insurance claim. Policies vary, and your insurer decides what is covered.

The inspection should also include checking the interior for water stains or moisture in insulation. Moisture meters can detect hidden dampness in roof decks or walls. This step helps the pros understand the full scope, so they can plan a repair that addresses both the roof and any water damage inside.

  • Walk the roof perimeter and around all penetrations
  • Look for bubbles or blisters in the membrane
  • Check seams and flashing for separation
  • Inspect gutters and downspouts for debris
  • Note any interior stains or musty odors
  • Take dated photos for your records

Repair Process Overview

Repairing hail damage usually starts with cleaning the roof surface and removing loose debris. For small punctures or tears, the pros patch the membrane with compatible material and sealant. Larger damaged sections may require cutting out and replacing the affected area, including insulation if it is wet.

After the roof repair, the pros address any interior water damage. This can involve drying or replacing wet insulation, repairing drywall, and treating mold-prone areas. The goal is to restore the roof's integrity and prevent further water intrusion, though the exact steps depend on the roof type and the extent of the hail impact.

Preventing Future Issues

Once the repair is complete, consider a regular roof maintenance schedule. Clear debris from drains and inspect seams after major storms. In Burnsville, where hail can occur, having a professional check the roof twice a year can catch small problems before they become leaks.

If your roof is older or already shows wear, a full replacement might be more cost-effective than repeated patches. Talk to a roofing professional about the condition of your membrane and insulation. They can advise on whether repair or replacement makes sense for your building, based on the damage and the roof's age.

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Frequently asked questions

How can I tell if hail damaged my flat roof without going up there?

Look for water stains on ceilings, walls, or near vents. Check gutters and downspouts for granules or debris that washed off the roof. If you see any signs, arrange for a professional inspection to confirm the damage and prevent further water intrusion.

Will hail damage always cause a leak right away?

No. Some punctures or cracks may not leak immediately, especially if the membrane is thick or the water evaporates. However, over time, water can seep into insulation and cause hidden damage. That's why it's important to inspect after a storm, even if no leak is visible yet.

What should I do if I find water inside after a hailstorm?

First, move any valuables or equipment away from the water. Place buckets under active drips and dry the area as well as you can. Then contact a water damage professional to assess the interior damage and coordinate with a roofer to fix the source, so the problem doesn't worsen.

Call Now (952) 522-6744