A leaking commercial roof needs three things, in this order: make the space safe, stop more water from getting in, and get the source found by someone qualified. Most of the cost and stress comes from skipping the third step. A patch placed over the wet spot on the ceiling often misses the real entry point. Below is the sequence we recommend to Houston-area building owners and property managers, with the repair methods, the cost drivers and the insurance steps that matter.
TL;DR
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Safety first: keep people away from wet ceilings and electrical equipment, then contain the water and photograph everything.
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Do not climb up and smear sealant on the roof yourself. Water often travels far from where it shows up inside, so the source needs a proper roof-system inspection.
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Repair suits localized damage. Widespread saturation or deck deterioration points to restoration or replacement. Published trade figures put restoration at $400 to $700 per square and replacement from $1,000 per square.
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Report the leak to your insurer and, if the roof has a manufacturer guarantee, to the manufacturer quickly. Keep receipts for temporary repairs.
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We offer a free roof inspection for commercial and residential properties in the Houston area.
Table of Contents
The first hour: make it safe, then contain the water
Water and electricity are the first danger. Federal preparedness guidance says that if you are standing in water or equipment is wet, you should not touch electrical equipment, and that you should turn off the electricity if it is safe to do so. OSHA explains that water carrying impurities can conduct electricity and recommends de-energizing electrical equipment before inspection or repair. If water is dripping near lighting, panels, server rooms or rooftop units’ disconnects, treat it as an electrical problem first and call your electrician or facilities lead.
Then work through the practical steps:
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Clear the area. Move people, inventory and equipment out from under the leak. Rope off wet floors.
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Contain the water. Keep people out of the area beneath a sagging or bulging ceiling. Do not puncture, touch or stand beneath it. Have qualified building-maintenance or restoration professionals assess the ceiling and a qualified roofer address the leak. If water is near electrical equipment, stay clear and contact a qualified electrician; do not operate a wet vacuum or touch wet equipment in that area. Contain drips only from a safe, dry position away from overhead and electrical hazards.
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Document it. One engineering firm’s leak-response checklist recommends verifying life safety first, then containing water, documenting with photos, video, time and weather, protecting assets and notifying stakeholders and insurance before bringing in qualified professionals. The weather note matters: a leak that appears only with wind-driven rain points to a different cause than one that appears after a dry week.
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Call a roofing contractor. Describe when the leak started, what the weather was doing and where the water appears.
Stay off the roof in bad conditions
It is tempting to run up and throw a tarp over the problem. OSHA warns that workers accessing roofs to install tarps face fall, electrocution and other hazards. Its guidance says nobody should work on a damaged roof until its strength and structural integrity have been determined, and that tarps should never go on during a storm while it is windy or raining. On a commercial roof, a saturated deck or insulation can be soft in places you cannot see. Wait for conditions to clear and let a trained crew do it.
Finding the real source of a commercial roof leak
The stain on the ceiling is where the water came out, not necessarily where it got in. The Canadian Roofing Contractors Association’s reference manual describes leak tracing as a roof-system investigation: water can travel within the roof assembly, along the slope, through deck flutes and down walls before it shows itself. The same page advises talking with building staff about the leak and the weather conditions at the time, then inspecting the entire roof, adjacent walls and rooftop equipment.
What an inspector looks at
The usual suspects on a flat or low-slope commercial roof are:
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Cracks, blisters and soft spots in the membrane
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Popped or backed-out fasteners
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Penetrations such as pipes, vents, drains and conduit
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Parapets, sidewalls and curbs with missing or failed flashing
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Plumbing, drainage or mechanical systems that only look like roof leaks (a clogged condensate line can mimic one)
How the diagnosis escalates
A trade article on persistent leaks says visual inspection is the first diagnostic step. If the source is still unclear, follow-up methods can include controlled water testing, infrared imaging, moisture-meter readings and, when necessary, destructive test or core cuts. The same author describes a standard investigation sequence: review project documents, evaluate the design, review service history, inspect, perform investigative testing, analyze findings and report conclusions.
For you as the owner, the practical lesson is to keep a roof file. Past repair invoices, the original specification, warranty papers and a log of previous leaks shorten the investigation and lower the bill. If you do not have one, start it with the first inspection.
Repair methods for commercial roof leaks
The right fix depends on the roof system and the failure. Commonly used approaches include patching, flashing replacement, sealant application and coating. One manufacturer’s silicone coating system, for example, is presented as an option to restore or repair EPDM, asphalt, TPO, metal, PVC, concrete and modified-bitumen roofs. The same literature stresses preparing the substrate and choosing the correct primer for it, with silicone sealant and reinforcement fabric used for repairs and maintenance.
| Problem found | Typical repair | What decides success |
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| Puncture or small split in membrane | Patch with compatible material | Clean, dry surface and matching material |
| Failed flashing at a curb, parapet or penetration | Replace or re-seal the flashing | Correct termination and compatible sealant |
| Seam separation | Re-seal or reinforce the seam | Finding out why it opened |
| Widespread surface wear with a sound deck | Coating system | Substrate prep and primer |
| Saturated insulation or deteriorated deck | Section or full replacement | Moisture survey results |
The common thread is preparation. Sealant over dirt, standing moisture or an incompatible old coating fails quickly, which is why a quick-and-cheap patch so often turns into a repeat call.
Our roof repair team handles leak repair, and our roof coatings page explains the coating option for roofs that are worn but still sound.
Repair, restore or replace: how to decide
A trade publication on the question says roofs with low-to-moderate damage and saturation are often restoration candidates, while elevated insulation saturation or decking deterioration may require reroofing. Restoration there means cleaning, priming where needed, patching to make the system watertight and applying a protective coating. Peel-adhesion testing and core cuts can help determine whether coating is viable on a given roof.
Cost ranges and what moves them
The same article reported restoration averaging $400 to $700 per square and replacement starting at $1,000 per square. A square is 100 square feet, so a 10,000-square-foot roof is 100 squares. On those published figures, restoring such a roof would run roughly $40,000 to $70,000, and replacement would start at $100,000. Those are national trade figures, not a quote for your building, and we do not publish prices for our work because every roof differs.
That also answers a question owners search often: how much does it cost to reseal a commercial roof? There is no single number, because resealing a few flashing details is a small repair and a full coating is a restoration project. The per-square restoration range above is the best published reference point for a full coating, and a spot repair is priced by the crew’s time, materials and access.
What moves the price:
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Roof size and coverage rates. On one 2022 project covering 77,600 square feet, switching to 5-gallon adhesive jugs instead of pressurized tanks reduced material costs by about $12,000. Material choices and application method add up at scale.
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Wet insulation. Saturated insulation has to be cut out and replaced, not coated over.
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Access. Roof height, ladders versus lifts and working around tenants affect labor.
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Roof type. Flat membrane, metal and sloped shingle or tile systems each repair differently.
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Urgency. Emergency work during a storm cycle costs more than a scheduled repair.
A simple rule of thumb
If the leak is one detail on an otherwise healthy roof, repair it. If you have had several leaks in different spots over a couple of years, ask for a moisture survey before paying for another patch. If the survey shows widespread wet insulation or a failing deck, replacement is usually the honest answer. For buildings where replacement is on the table, metal roofing and roof replacement are the options to price side by side.
Insurance and warranty: report fast, document everything
Does commercial property insurance cover a roof leak? It depends on your policy and on the cause of the loss, so read yours and ask your agent. What is not in doubt is the timing. The Insurance Information Institute says a business should contact its insurance professional and insurer as soon as possible after an insured loss, review the policy, document building damage and keep an inventory of damaged property and receipts.
The same page says reasonable temporary repairs, such as placing a tarp over an exposed roof area, may be made to prevent further damage when the area is safe, and that you should keep receipts because temporary-repair payments form part of the total settlement. In practice:
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Photograph and video the damage, inside and out, with date and weather noted.
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Call your agent and insurer before permanent repairs begin.
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Make safe, reasonable temporary repairs and save every receipt.
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Keep damaged items for the adjuster where you can.
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Get a written inspection report and estimate from your roofer to support the claim.
We assist homeowners and policyholders with insurance claims, and a written inspection from a contractor who knows what adjusters look for helps keep the paperwork clean.
Check for a manufacturer guarantee
Many commercial roofs carry a manufacturer guarantee, and these have notice deadlines. One manufacturer’s owner’s manual says time is of the essence after a leak and instructs owners to confirm the source is the roof and contact Owner Services within 30 days of discovering the leak, with the guarantee number, location and access information ready. Your own guarantee may have different terms, so find the document and read the notice section before anyone touches the roof. An unauthorized repair can complicate coverage.
Perspectiv
Get the leak looked at by a local crew
If you manage a building in Houston, Pasadena, Pearland, Sugar Land, The Woodlands, League City, Friendswood, Waller, Galveston or the surrounding area, we can inspect the roof, find the source and give you a written estimate for repair, coating or replacement at no charge.
Book your free roof inspection, or visit Holladay Family Roofing to see everything we do for commercial and residential roofs.
Choosing a contractor for a commercial leak
A good contractor makes your decision easier. Look for these signs:
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They inspect the whole roof system. A contractor who quotes a patch from the ground or a phone photo is guessing.
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They explain the cause. You should leave knowing whether the problem was flashing, a seam, a penetration, drainage or age.
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They give a written scope. It should name the materials, the primer or prep and the warranty terms.
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They separate repair from replacement. Ask for the repair price and the long-term option, so you can compare.
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They are comfortable with insurance and guarantee paperwork. They should provide photos and a report, and know how to work around a manufacturer guarantee.
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They stand behind the work. Ask what is covered, for how long and what you must do to keep it valid.
Before the crew arrives, gather the roof file, any warranty papers, your photos and a list of when and where the leak appeared. Provide roof access and a site contact. That preparation alone can save an hour of diagnosis.
Prevention after the repair
Once the leak is fixed, schedule routine inspections and keep drains, scuppers and gutters clear. Inspect after major storms, log the findings and fix small flashing or sealant problems before they turn into interior damage. Small, regular repairs cost far less than a ceiling collapse or a wet-insulation replacement.
FAQ
What should I do first if my commercial roof is leaking?
Keep people away from the wet area and stay clear of electrical equipment, and shut off power only if you can do it safely. Contain the water, photograph the damage and note the weather. Then call a roofing contractor and your insurance agent. Do not go onto the roof during rain or wind.
Can a commercial roof leak be repaired, or does the roof need replacing?
Localized damage, such as a failed flashing, a puncture or a seam, can usually be repaired. Widespread saturation of the insulation or a deteriorated deck may call for reroofing, according to trade guidance. A moisture survey or core cuts settle the question with evidence instead of guesswork.
How much does it cost to repair or reseal a commercial roof?
It depends on size, roof type, access and how much of the roof is wet. Published trade figures put full restoration at about $400 to $700 per square and replacement from $1,000 per square, while small spot repairs are priced on labor and materials. We provide free written estimates after an inspection.
Does commercial insurance cover roof leaks?
Coverage depends on your policy and what caused the leak, so ask your agent and read the policy. Report quickly, document the damage, make reasonable temporary repairs and keep every receipt. If your roof has a manufacturer guarantee, check its notice deadline too.
What is the best thing to cover a leaking roof temporarily?
A properly secured tarp is the usual temporary measure, installed only when the roof is safe to access and the weather has cleared. OSHA warns against tarping during a storm or on a roof of uncertain strength. A contractor can do it safely and document it for your insurer.