Commercial Roof Storm Damage: A First-24-Hour Checklist

After storm damage to a commercial roof, work in this order: make the building safe, contain interior water, photograph everything, notify your insurer as soon as you can, and get a qualified commercial contractor to dry in the roof. This checklist is for property managers in Cincinnati and the northern suburbs. It focuses on the decisions that are easy to get wrong under pressure.

Commercial flat roofs are different from homes. The membranes fail in different ways, the policies are built differently, and more money is at stake.

What should a property manager do in the first 24 hours?

1. Life safety. Before anyone goes on the roof, decide whether the building is safe to occupy. Sagging ceilings, water near electrical gear, damaged structural steel, or falling ceiling tiles are reasons to clear the affected area. Check for leaks above equipment, server rooms, and electrical panels. If you are unsure, clear the area until someone qualified can assess the structure.

2. Interior containment. Assume the leak is still active. Cover equipment, files, inventory, and furniture with heavy plastic sheeting. Put buckets or lined bins under drips. Water-loaded ceiling tiles and sagging drywall can fall without warning. Keep people out from under them, and have a qualified person decide whether and how to relieve the water.

3. Photos before anything moves. Photograph each affected area: wide shots, close-ups of stains and drips, ceiling tiles, walls, and tenant property. When the roof is safe to access, photograph each roof section, the membrane, seams, penetrations, parapets, scuppers, and drains. Use a phone that records the date and location.

4. Notify your insurer. Commercial policies usually require notice "as soon as practicable" or "prompt" notice. In Ohio, there is no fixed number of hours. The Ohio Supreme Court reads "prompt" notice as notice "within a reasonable time in light of all the surrounding facts and circumstances" (Ferrando v. Auto-Owners, 2002, quoting Ruby). Do not wait. Read your notice clause, report the storm date, send the first photos, and get a claim number. If you have business income coverage, give notice of that too. You do not need a dollar figure yet.

5. Emergency dry-in. Use a contractor who works on commercial low-slope roofs, carries the insurance your building requires, and knows your membrane type. Ask them to document every area they touch.

For the homeowner version of this sequence, see our first 48 hours after storm damage guide.

How does storm damage differ on TPO, EPDM, and modified bitumen?

Each membrane fails in its own way. Naming the failure correctly helps the claim, because the damage you report should match how that membrane behaves.

TPO (single-ply thermoplastic). TPO is a heat-welded membrane, often white. After hail and wind, check for seam separation along welded laps, fractures at curbs and penetrations, and wind damage at parapet edges and termination bars.

EPDM (rubber). EPDM is a rubber membrane, usually black. Look for punctures from wind-blown debris, seams where the adhesive or tape has let go, and tears that start at existing holes. A small tear near a seam can grow if it is not fixed before the next storm.

Modified bitumen ("mod bit"). Mod bit is a multi-layer asphalt system. Hail can loosen the top cap sheet from the layer below, cause bruises you can find only by touch or by cutting a sample, and knock off granules. Damage here is often disputed, so document it closely. Core samples can help.

A contractor who knows the system should be able to walk the roof and explain, section by section, what they see and which damage fits the storm.

Does business interruption coverage apply to roof storm damage?

It can. Business income coverage, also called business interruption, is usually its own part of a commercial property policy. It pays lost income and continuing expenses when covered physical damage forces you to stop or slow operations.

The trigger. The income loss must come from direct physical damage, by a covered cause of loss, at the premises listed in the policy. Check whether your policy excludes flood or other water damage.

The waiting period. Many business income forms do not pay for income lost in the first hours after the damage. The common ISO business income form starts that coverage 72 hours after the damage. On that same form, extra expense coverage starts right away. Check your declarations for your own waiting period.

Here is what that means in practice. Suppose your policy has a 72-hour waiting period:

A faster dry-in does not raise the share your policy pays. It shortens the whole shutdown, so the total loss is smaller. If you can stay under the waiting period, you may have little or no business income claim at all. Extra expense coverage may still help pay for the costs of staying open, such as temporary space or overtime.

Proving the loss. Start a log on day one. Track lost sales, idle payroll, spoiled inventory, and extra costs to keep running. Tie each item to the physical damage.

Shamrock was founded by contractors and former insurance adjusters. We document roof damage and dry-in work so your team and your adjuster are looking at the same facts. Your insurer decides coverage. Our Ohio storm claim guide explains the deadlines Ohio insurers must meet.

Who can tarp and dry in a commercial roof in Ohio?

Ohio does not license roofers at the state level. The state licenses only HVAC, refrigeration, electrical, plumbing, and hydronics contractors (ORC 4740.01). That puts the checking on you.

Before a contractor goes on the roof, verify three things:

1. Commercial general liability insurance at the limits your lease, lender, or insurer requires, with your entity named as certificate holder.
2. Ohio workers' compensation coverage. You can confirm it with the Ohio BWC employer lookup.
3. Experience with your membrane. Ask whether they have worked on your system, for example a GAF EverGuard TPO roof, and what repair materials they will use.

Ask for current certificates, not last year's. Ask your local building department whether the permanent repair needs a permit.

Shamrock offers commercial restoration and water remediation services. For the interior side of a commercial leak, our water damage restoration guide explains why drying fast matters.

Repair, recover, or tear-off?

There are three ways to fix a storm-damaged commercial roof. Insurers and owners often disagree about which one is needed.

Repair. Fix a punctured section, a failed seam, or a small damaged area. This fits when the deck is sound, the insulation is dry, and the rest of the membrane has good life left.

Recover (overlay). Install a new membrane over the old one. This can work when the deck is sound, the insulation is dry, and code and the building allow a second roof layer. It saves tear-off cost and time. It is the wrong choice when moisture is trapped below, because the new membrane seals the moisture in.

Tear-off and replace. Remove the old system down to the deck. This fits when insulation is wet across large areas, the deck has problems, or the damage is too widespread for the other options. It costs the most and resets the roof's service life.

Moisture surveys, core samples, and infrared scans show whether insulation is wet. Ask your contractor to bring that evidence to the scope meeting.

What not to do

• Do not send maintenance staff onto a wet membrane roof to "take a look." Wet membranes are slippery.
• Do not let anyone dry in a commercial membrane with residential tarps nailed through the field.
• Do not move debris on the roof or inside until it has been photographed in place.
• Do not sign an assignment of benefits under pressure. It is a legal decision, not an emergency task.

Get ready before the next storm

The best time to plan is before the storm. A pre-storm roof inspection gives you dated photos of the roof's condition, which help if you file a claim later. It also tells you which repairs to make now.

If you manage commercial or industrial property in the Cincinnati area, request a commercial inspection.

Related guides

For building owners and property managers, these guides are the natural next step: our water damage restoration guide, the first 48 hours after storm damage checklist, and our homeowner-focused roof inspection after a storm guide.