Tornado season can create serious challenges for commercial property owners and facility managers. While tornadoes are often associated with dramatic wind damage, the effects on a commercial building can extend far beyond the roof. High winds, flying debris, heavy rainfall, and sudden structural damage can allow water to enter the building, damaging ceilings, walls, insulation, inventory, equipment, and floors.

For businesses in Detroit and throughout Southeast Michigan, preparing commercial properties for severe weather is an important part of protecting the building and maintaining business continuity. At Motor City Roofers, we understand that commercial roofing is about much more than keeping rain outside. A properly maintained roofing system is an important line of defense when severe weather arrives.

Tornado Winds Can Cause Major Roof Damage
The most obvious threat during a tornado is extreme wind. Commercial roofs can experience tremendous pressure when powerful winds move across and around a building.
Roof membranes can be punctured, torn, or lifted. Flashing and edge metal can become damaged, while rooftop equipment may be affected by wind or debris. In severe cases, sections of roofing can become detached completely.

Even when a roof appears intact from the ground, damage may exist underneath the surface. Wind can loosen fasteners, compromise seams, damage insulation, or create openings around penetrations. These problems may not become obvious until the next rainfall.

That is why a professional roof inspection following severe weather is so important.
Flying Debris Creates Additional ProblemsTornadoes can turn ordinary objects into dangerous projectiles. Tree branches, signs, roofing materials, construction debris, and other objects can strike a commercial roof at high speeds.

A roof membrane that appears relatively durable can still be punctured by sharp or heavy debris. A single penetration may provide enough of an opening for rainwater to enter the roof assembly.
Debris can also damage rooftop HVAC units, vents, skylights, drains, and other equipment. Because commercial roofs contain numerous penetrations and accessories, there are many potential points where storm damage can occur.

Heavy Rain Can Turn Roof Damage Into Interior Damage
The tornado itself may last only a few minutes, but the resulting water damage can continue long afterward.
If a storm damages the roofing membrane, rainwater may enter the building. Water can travel through insulation and roofing materials before eventually appearing inside the facility. By the time a ceiling stain becomes visible, moisture may already have traveled well beyond the original entry point.
Interior water damage can affect:

• Ceilings and drywall
• Electrical systems
• Flooring
• Machinery and equipment
• Inventory and raw materials
• Office furniture
• Computer equipment
• Insulation
• Finished products

For warehouses and manufacturing facilities, water intrusion can be especially disruptive. Products may need to be relocated, production may have to stop, and employees may be unable to safely work in affected areas.
Commercial Floors Are Vulnerable TooThe connection between roof damage and floor damage isn't always immediately obvious.

Water entering through a damaged roof can eventually reach the building's floor. Depending on the facility, this can damage carpeting, hardwood, concrete coatings, warehouse flooring, or other specialized surfaces.
Standing water can also create slippery conditions that increase the possibility of employee or customer injuries. In a busy warehouse or manufacturing facility, even a relatively small amount of water can interfere with forklifts, equipment, foot traffic, and production activities.

Addressing roof leaks quickly can therefore help prevent a roofing problem from becoming a much larger building maintenance and safety issue.

Water Can Damage Insulation
Commercial roofing systems commonly contain insulation beneath the roof membrane. When water penetrates the system, insulation can become saturated.  Wet insulation doesn't perform the same way as dry insulation. Moisture can reduce thermal performance and potentially contribute to deterioration of other roofing components.

If moisture remains trapped within the roof assembly, simply repairing the visible leak may not solve the entire problem. A professional evaluation can help determine whether affected insulation needs to be dried, repaired, or replaced.

Don't Assume a Small Leak Is a Small Problem
One of the biggest mistakes a facility manager can make after severe weather is assuming that a minor leak isn't important.  A small water stain might indicate a localized issue—or it could be the first visible symptom of significant damage inside the roofing system.
After a tornado or severe windstorm, look for warning signs such as:

• New ceiling stains
• Dripping water
• Damaged roof membrane
• Loose flashing
• Missing edge metal
• Punctures or tears
• Damaged rooftop equipment
• Standing water
• Blocked drains
• Interior odors or dampness

Any of these conditions deserve attention.
Have the Roof Inspected After Severe WeatherA post-storm commercial roof inspection should be part of a facility's emergency plan. A professional roofing contractor can examine areas that aren't easily visible from the ground and identify damage before it becomes a larger problem.

An inspection may include evaluating the membrane, seams, flashing, drains, penetrations, perimeter details, insulation, and rooftop equipment.

Documentation is also valuable. Photographs and written inspection findings can help facility managers understand the extent of damage and establish a record for maintenance or insurance purposes.
Protect Your Business ContinuityA damaged roof can quickly become a business problem.

If water reaches production equipment, inventory, electrical components, or finished products, the consequences may extend far beyond the cost of repairing the roof. Business interruptions can result in lost production, delayed shipments, unhappy customers, and additional labor costs.

That's why commercial roof maintenance should be viewed as part of business continuity planning.
Facility managers should know:

1. Who to contact when roof damage occurs.
2. Where emergency roofing supplies are located.
3. How to safely restrict access to affected areas.
4. Where critical inventory or equipment can be relocated.
5. How to document storm damage.
6. Which roofing systems are installed on each building.
7. When the roof was last inspected or repaired.

Having this information available before severe weather arrives can save valuable time.

Preventative Maintenance Matters Before Tornado Season
Storm preparation begins long before the weather forecast calls for severe storms.
Routine commercial roof inspections can identify loose components, deteriorated flashing, damaged seams, blocked drainage systems, and other vulnerabilities. Correcting these problems in advance may reduce the possibility of storm-related damage.

Facility managers should also keep roof drains and drainage pathways clear. Proper drainage is particularly important when severe storms produce large amounts of rainfall in a short period.
Rooftop equipment and other objects should be properly secured according to applicable requirements, and areas around the building should be maintained to reduce the amount of loose material that could become airborne.

Emergency Repairs Should Be Done Correctly
After a tornado, temporary measures may sometimes be necessary to protect the building from additional water intrusion. However, temporary protection should not automatically be considered a permanent repair.
Tarps or temporary patches may help control immediate exposure, but the underlying roofing system should still be professionally evaluated. A proper repair should address the source of the problem and restore the roof's ability to protect the building.

In some cases, storm damage may be limited enough for repairs. In other situations, extensive damage may make restoration or replacement the more appropriate option.

Trust Motor City Roofers With Your Commercial Roofing Needs
Severe weather is unpredictable, but commercial property owners can take steps to reduce the risks. Regular inspections, preventative maintenance, proper drainage, and prompt storm response can all help protect the roof and the business underneath it.  Motor City Roofers, located in Detroit, Michigan, provides commercial roofing services designed around the needs of businesses and facility managers. From inspections and repairs to larger roofing projects, the goal is to help commercial properties remain protected and operational.
Tornado season shouldn't be treated as simply a roofing concern. A damaged roof can lead to damaged floors, equipment, inventory, and interrupted operations. By taking a proactive approach to commercial roof maintenance and responding quickly when severe weather strikes, facility managers can limit damage and get their businesses back on track as quickly as possible.  When severe weather threatens your commercial property, the roof is your first line of defense. Make sure it's ready before the storm arrives.