If your commercial roof is leaking, act in this order: protect people and equipment inside, contain the water, photograph everything, and call a roofer to make a temporary repair before the next rain. Then find the true source of the leak, because water often enters one place and shows up many feet away. We are Stalwart Roofing in Baton Rouge, and this guide covers what we see on Louisiana commercial roofs, how leaks are traced, who pays, and when a repair stops making sense.
TL;DR
- Make the space safe first. Wet ceilings can hide live electrical hazards, so keep people and power away from the affected area.
- Document the damage with dated photos and notes before you move anything. You will need them for insurance and for any lease conversation.
- The visible stain is rarely the entry point. Flashing, seams, drains and penetrations cause most leaks, and tracing takes method, not guesswork.
- Insurance usually pays for sudden storm damage, not for wear and neglected maintenance. Inspections twice a year keep your claim defensible.
- Your lease decides who repairs the roof. Read it before you hire anyone.
Table of Contents
- What to do in the first hour
- What causes commercial roof leaks
- Why the stain is not the leak
- Repair, restore or replace
- Does commercial insurance cover roof leaks?
- Who is responsible for a leaking roof: landlord or tenant?
- Perspective: what we see on Louisiana roofs
- Preventing the next leak
- Fixing it with Stalwart Roofing
- FAQ
- Sources
What to do in the first hour
The first hour is about limiting damage, not fixing the roof.
- Protect people. Close off wet areas. Water can turn normally insulating materials into conductors, and IIBEC’s leak-detection paper warns that leaks can energize metal piping or conduit. Never assume a wet pipe or fixture is safe. If water is near panels, lighting or outlets, shut off power to that circuit and call an electrician. OSHA’s electrical safety guidance lists grounding and protective devices among the basic ways to prevent shock injuries.
- Contain the water. Move inventory, files and computers. Use buckets, plastic sheeting and, where it is safe, a wet vacuum. Punch a small hole in a bulging ceiling tile to drain it in a controlled way rather than letting it fail over a desk.
- Document. Take wide and close photos with dates, note the time rain started, and keep damaged items for the adjuster.
- Call for a temporary repair. The National Roofing Contractors Association advises that in an emergency you patch leaks to minimize property loss. We offer emergency roof repairs and roof tarping for exactly this situation.
- Stay off the roof yourself. Wet membranes are slick, and a fall is a worse problem than a leak.
A tarp or temporary patch buys time. It is not the repair. Plan the permanent fix once the roof is dry enough to be inspected properly.
What causes commercial roof leaks
Most commercial buildings in our area have low-slope or flat roofs: TPO, modified bitumen, built-up systems, or metal. Water has few places to go on those roofs, so small flaws matter. The causes we find most often:
- Failed flashing and sealant. Where the membrane meets a wall, curb, parapet or rooftop unit, sealant cracks and metal flashing pulls loose. This is the most common entry point.
- Open or split seams. Seams in single-ply membranes can separate from age, poor welding, or movement as the roof heats and cools.
- Punctures and tears. Foot traffic from HVAC technicians, dropped tools, debris and fallen limbs all cut membranes.
- Ponding water. Water that sits more than a couple of days after rain stresses the membrane and speeds up aging. Clogged drains and scuppers are usually the reason.
- Penetrations. Pipes, vents, conduit and skylights each add a seal that has to hold for years.
- Age. Membranes shrink, become brittle and lose granules. A roof near the end of its life leaks in many places, not one.
- Storm damage. Wind lifts edges and hail bruises membranes. In Louisiana, tropical storms and summer thunderstorms test every weak spot, and our commercial roof maintenance guide for Louisiana covers how to prepare through the seasons.
For more on recurring trouble spots, see our write-up of common commercial and multi-family roofing problems and our commercial roof leak repair tips.
Why the stain is not the leak
Water travels. It runs along decking, follows insulation seams, drops onto a duct and then drips from a ceiling tile thirty feet from where it came in. Patching above the stain is the most common reason leaks “come back.”
Tracing a leak properly means working from the inside out and from the roof down:
- Interview and map. When does it leak: every rain, only wind-driven rain, only after heavy rain? That pattern points to drains, flashing or vertical surfaces.
- Visual survey. Check flashing, seams, drains, penetrations and any patches from earlier repairs. Previous patches are frequent suspects.
- Moisture scanning. Infrared thermography helps identify trapped moisture in insulation, and moisture meters confirm what the camera suggests.
- Electronic leak detection (ELD). On suitable membranes, low-voltage or high-voltage ELD pinpoints breaches by passing current through the water path. IIBEC’s authors describe combining ELD, infrared and impedance scanning as a strategic approach, and they stress these tools do not replace careful visual observation and quality assurance.
- Water testing. When everything else is inconclusive, controlled water testing isolates one section at a time, starting low and working up.
Not every roof needs every method. A clear failed flashing detail does not call for a full scan. A chronic, mystery leak does. We would rather spend an hour tracing correctly than patch three times.
Repair, restore or replace
The right answer depends on how much of the roof is still sound. Here is how we frame the decision for building owners:
| Situation | Usually points to |
|---|---|
| One or two defined entry points on a roof in decent shape | Targeted repair |
| Repeated leaks from seams or flashing across one area | Section repair and re-flashing |
| Wet insulation across a large area | Remove and replace the wet material, then reassess the membrane |
| Leaks in many places, brittle membrane, past typical service life | Replacement |
| Storm damage with a covered loss | Repair or replacement through the claim |
Wet insulation is the factor owners miss. If the membrane is patched over saturated insulation, the water stays trapped, the roof underperforms, and leaks continue. A scan before you decide pays for itself.
We do not publish prices because commercial roofs vary too much for a number to mean anything: size, membrane, access, drainage and how much insulation is wet all change the scope. What we do is inspect, show you what we found, and give you a written assessment with options. If a repair is the honest answer, that is what we recommend. If the roof is finished, we say so and explain why. Our roof repair versus replacement guide for Baton Rouge walks through the same logic, and our page on best materials for commercial roofing helps if replacement is on the table.
Does commercial insurance cover roof leaks?
Sometimes. The deciding question is what caused the leak.
Commercial property policies generally cover damage from named perils such as windstorm, hail or fire. They typically exclude wear and tear, lack of maintenance and long-term deterioration. The Insurance Information Institute notes that an old or poorly maintained roof raises the risk of interior damage, including mold, damaged contents and business interruption. Insurers may also require an inspection on older roofs, and coverage on an aging roof may be limited to actual cash value rather than replacement cost.
What that means in practice:
- A hurricane or wind event that tears membrane or flashing is the kind of sudden loss a policy is built for.
- A slow leak at a worn seam that nobody inspected for years is the kind a carrier is likely to push back on.
- Records matter. Inspection reports, maintenance logs, dated photos and repair invoices show the roof was cared for and the loss was sudden.
Read your policy for your windstorm or named-storm deductible, and ask your agent how it applies to roof damage. Louisiana policies often treat hurricane losses differently from other wind losses, and the details are in your own declarations page. We document storm damage thoroughly for building owners and can work alongside your adjuster. Our guide to commercial storm damage restoration explains the process.
Who is responsible for a leaking roof: landlord or tenant?
Your lease decides. In many commercial leases, the landlord keeps responsibility for structural components and the exterior, including the roof, while the tenant handles the interior. But that is a common pattern, not a rule. Net leases often push roof costs to the tenant, and some leases split repair costs from replacement costs.
Courts read the exact language. A Fifth Circuit opinion involving a hail-damaged warehouse roof and a landlord-tenant lease dispute shows how the case turned on lease provisions, including those that apply after storm damage, rather than on general assumptions about who owns the roof.
Before you call anyone, check these items in your lease:
- Who maintains and repairs the roof, and who pays for replacement
- Notice requirements: how fast the tenant must report a leak, and in what form
- Casualty and insurance clauses that apply after storm damage
- Whether the tenant may hire a contractor or must go through the landlord
- Rooftop equipment installed by the tenant, and who answers for penetrations made for it
Property managers handling multiple buildings benefit from standard written scopes for each. A well-drafted commercial maintenance contract spells out who does what, how often, and who pays, and the same discipline applies to roof duties in a lease. When a leak happens, send written notice right away and keep a copy. Delay can complicate both the lease position and the insurance claim.
Perspective: what we see on Louisiana roofs
We have more than 25 years of roofing experience in Baton Rouge, and our view is simple: most commercial leaks are cheaper to prevent than to chase. Our heat, humidity, heavy rain and hurricane-season wind put roofs through more stress than most of the country. A seal that survives a mild winter somewhere else can fail here in a few summers.
Three habits separate buildings with few leaks from buildings with many:
- They inspect on a schedule. The NRCA recommends inspecting roofs at least twice a year, in spring and fall, and after any severe storm. In Louisiana we would add a check before the heart of hurricane season. Our roof inspection frequency guide for Louisiana explains the timing.
- They keep drains clear. A clogged scupper after one storm can put inches of water on a roof that was not designed to hold it.
- They control rooftop traffic. Service techs are the leading cause of avoidable punctures. Walk pads and a roof access log cost little.
We also believe in telling owners the truth when the news is mild. Many leak calls end with a flashing repair and a drain cleaning, not a new roof. You should never feel pressured into a bigger job than the roof needs. That is why our assessments are written, clear and free of sales tactics, and why our work carries a five-year workmanship warranty.
Preventing the next leak
A short, practical program works for most commercial roofs:
- Inspect twice a year and after storms. Record findings with photos so you can track changes over time.
- Clear debris and drains. Remove leaves, limbs and trash from the field, drains, gutters and scuppers. Louisiana’s oak and pine debris collects quickly.
- Re-seal flashing and penetrations early. A small sealant repair now avoids a membrane replacement later.
- Fix small damage promptly. Minor tears and open seams grow with every thermal cycle.
- Keep every record. Maintenance logs support insurance claims and warranty coverage.
- Address ponding. Standing water points to drainage or structural issues that need attention.
For metal roofs, upkeep is slightly different: fasteners, panel seams and sealants need periodic checking. Our guide to metal roof maintenance covers it. If you want to avoid common errors, read about roof maintenance mistakes.
Leaks also bring secondary problems. Moisture in insulation and ceilings can lead to mold within a day or two. Our article on mold from a roof leak explains the timeline and when to call professionals.
Fixing it with Stalwart Roofing
We handle commercial leak repair, emergency tarping, storm damage restoration, maintenance programs, flat roof TPO and commercial metal roofing for businesses and property managers in Baton Rouge. You can see everything on our commercial roofing page. If you are unsure how bad the problem is, book a roof inspection. We will trace the source, tell you what we found and give you options without pressure.
FAQ
How much does it cost to fix a commercial roof leak?
The cost depends on the cause, roof type, access and how much insulation is wet. A flashing repair is a very different job from replacing a saturated section. We do not quote prices without seeing the roof, but we give a written assessment with clear options after an inspection.
When should I worry about a roof leak?
Worry right away if water reaches electrical equipment, sagging ceiling tiles, or a space with inventory or sensitive equipment. Worry soon if the same spot leaks after every rain, if stains spread, or if you smell mustiness. Mold can start within a day or two, so even a small leak deserves a fast response.
Does commercial insurance cover roof leaks?
It typically covers sudden damage from a covered peril such as wind or hail. It generally does not cover leaks that result from wear, age or poor maintenance. Keep inspection and repair records, and ask your agent how your policy treats roofs of your roof’s age.
Are commercial landlords responsible for roof leaks?
Often, but only if the lease says so. Many leases make the landlord responsible for the roof and the tenant responsible for the interior, while others shift roof costs to the tenant. Read the repair, insurance and casualty clauses, and give written notice of any leak immediately.
Can a commercial roof leak be repaired in the rain?
A temporary patch or tarp can go on to stop active water, but a lasting repair needs a dry surface. We use temporary measures to protect your building, then schedule the permanent fix when conditions allow.
Sources
- The Leak Stops Here: Understanding the Methodology of Leak Detection for Roofing and Waterproofing Systems, IIBEC
- OSHA electrical safety publication
- How Your Roof Influences Your Home and Business Insurance, Triple-I
- United States Court of Appeals for the Fifth Circuit opinion on a hail-damaged commercial roof and lease
- NRCA roofing guidelines on inspection and emergency patching
