The short answer
How Wind Damages Commercial Roofs
Strong wind can lift or peel back roofing membranes, especially at edges, corners, and around penetrations like vents or HVAC units. Once the membrane is lifted, wind can catch it like a sail and tear it further, exposing the decking to rain. You might not notice the damage from the ground, but water can enter through these small openings.
Wind can also blow loose gravel from a built-up roof, which then acts like projectiles against your roof and nearby surfaces. Missing gravel exposes the underlying layers to UV rays and water, speeding up deterioration. After a windy storm, look for displaced flashing, curled shingles, or any visible gaps in the roof surface.
- Check for lifted or curled edges at roof perimeters
- Look for missing or displaced gravel on built-up roofs
- Inspect around vents, pipes, and HVAC units for gaps
- Note any new dents or punctures from flying debris
- Take photos of anything suspicious for your records
Hail and Debris Impact
Hail can dent metal roofs, crack shingles, or create small punctures in membrane roofs. Even if the damage looks cosmetic, the protective coating is compromised, and water can seep through over time. Large hail can also knock granules off shingles, reducing their ability to shed water and reflect UV rays.
Flying branches or other debris can hit your roof with enough force to break through the surface. A single impact can leave a hole that allows rain to pour into your building. After a storm, walk the perimeter and look for fallen branches or obvious damage, but use caution and avoid climbing onto a wet or damaged roof yourself.
Heavy Rain and Ponding Water
Storms often bring intense rain that can overwhelm your roof's drainage system. If gutters, downspouts, or internal drains are clogged, water can pool on the roof. Ponding water adds weight and pressure, which can cause the roof structure to sag or the membrane to deteriorate faster.
Over time, standing water can seep into tiny cracks and seams, leading to leaks that appear inside your building. You might see water stains on ceilings, damp insulation, or dripping from light fixtures. If you notice ponding water that doesn't drain within two days, you need to address the drainage issue to prevent long-term damage.
Signs of Storm Damage to Look For
After a storm, inspect your roof from the ground or a safe vantage point. Look for missing shingles, torn membrane, dented metal panels, or loose flashing. Inside your building, check ceilings, walls, and around vents for water stains, dampness, or musty odors.
Also check the area around your roof drains and scuppers for blockages or overflow. If you have a flat roof, look for bubbles or blisters in the membrane, which can indicate trapped moisture. If you find any of these signs, it's important to act quickly to minimize water intrusion and prevent mold growth.
Policies vary, and your insurer decides what is covered.
- Water stains on ceiling tiles or walls
- Damp insulation or wet spots in the attic
- Cracked or missing caulking around roof penetrations
- Shingle granules in your gutters
- Visible daylight through roof boards
- Musty smell in upper rooms
What to Do After Storm Damage
If you suspect your commercial roof is damaged, take immediate steps to limit further water entry. Place buckets under active leaks and move valuable items away from affected areas. You can also cover small holes with a tarp if it's safe to do so, but never risk your safety on a wet or unstable roof.
Contact local water damage pros to inspect the roof and interior for hidden moisture. They can identify the extent of damage and help dry out affected areas to prevent mold. In the meantime, document all damage with photos and keep receipts for any temporary repairs you make, as these may be useful for your insurance claim.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (208) 729-2441Frequently asked questions
How soon should I inspect my roof after a storm?
You should inspect your roof as soon as it is safe to do so, ideally within a day or two. Waiting too long can allow leaks to worsen and cause more interior damage. If you cannot safely inspect yourself, call a professional to do it for you.
Can storm damage cause mold in my building?
Yes, if water gets into your building and stays damp, mold can start growing within 24 to 48 hours. Mold can damage walls, insulation, and furnishings, and may cause health issues. If you notice a musty smell or visible mold, see a doctor if you feel unwell and contact a mold professional.
Will my insurance cover storm damage to my commercial roof?
Policies vary, and your insurer decides what is covered. Many commercial policies cover storm damage, but you need to review your specific policy and file a claim promptly. Check your policy for any exclusions or deductibles that might apply.