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Home/Service Areas/Louisiana/Gretna/Commercial Roof Repairs

Commercial Roof Repairs in Gretna, LA

Big Easy Roofing repairs commercial and low slope roofs across Gretna and Jefferson Parish. On a Gretna commercial reroof the permit route is decided by the city limit and the historic district rule can reach a storefront that faces a downtown corridor, so both questions are settled before the survey rather than found later.

Get Your Commercial Quote! Call (504) 800-8196
IBC Chapter 15Code for your building
Two officesCity or parish, by address
740 2nd StreetCity Building Department
Written scopeBefore mobilisation

Gretna commercial roof repairs at a glance

A commercial roof in Gretna is normally low slope, which changes what fails and which code governs it. Since 2025 a commercial re roof also needs its own permit and inspection under state law, and which office issues it depends on which side of the city limit the building sits.

What we repair

Low slope and metal

Single ply TPO and EPDM, modified bitumen, built up gravel systems, and standing seam or R panel metal. Repairs cover seams and laps, penetrations and curbs, drains and scuppers, parapet and coping details, and storm damage. Call Big Easy Roofing on (504) 800-8196 and we will survey the assembly before quoting.

Which office covers you

City or parish, by boundary

Inside the Gretna city limits the City of Gretna Building Department at 740 2nd Street handles the permit and the inspection. Outside them Jefferson Parish does, at the general commercial permit route rather than a roofing line. The city limit decides it, not the mailing address.

Which code applies

IBC Chapter 15

Louisiana R.S. 37:3737(I)(1) sends buildings other than one and two family dwellings to International Building Code Chapter 15, as adopted by the state. Only (I)(2), the houses, goes to the residential code. Louisiana is on the 2021 editions with state amendments.

The city and the HDC share a building

One office, two desks

The City of Gretna Building Department and the Historic District Commission sit at the same address, 740 2nd Street, so a downtown property that needs both a building permit and a Certificate of Appropriateness is handled by two desks in one building rather than two offices in two towns.

The survey

Assembly, drainage and moisture

We identify the membrane and its age, walk the drainage to find where water actually stands, check every penetration and curb, and look for wet insulation below the membrane. A repair over saturated insulation is likely to fail again, so it gets found before it is not after.

Warranty

Workmanship on the repair

The repair carries our workmanship warranty. Where the membrane is still inside a manufacturer warranty we work to the manufacturer detail rather than against it, because an incompatible patch can void the remaining cover on the whole roof. The terms are the manufacturer's, so we confirm what they require before starting.

A commercial roof rarely announces itself the way a house roof does. There is often no attic to stain and no ceiling directly under the deck, so the first sign is a damp patch in an office two bays away from the actual defect, or an insulation board that has been quietly wet for a year. By the time it is visible inside, the assembly below the membrane has generally been holding water for some time.

That is why a commercial repair starts with the drainage rather than the leak. Low slope roofs are designed to move water to a small number of drains or scuppers, and the first thing to check on a repeat repair is whether water is getting there at all: a drain proud of the deck, a scupper blocked since the last storm, or a section that settled and now holds a pond after every rain. Fix the defect and leave the pond, and that seam is the one likeliest to go again.

The second thing that has changed is administrative rather than physical. Under the 2025 state law a commercial reroof now needs its own roofing permit and inspection. In Gretna that means one of two routes, city or parish, and which of them applies is settled by the city boundary rather than by the postal address. On top of that, a downtown Gretna building that sits inside the local historic district can trigger a Certificate of Appropriateness where a change to the roof is visible from public right of way, so the visibility question is asked before the scope is priced.

Six commercial roof systems and what each is really buying you

The five common low slope systems and the one steep slope commercial covering, with the estimated installed range and the realistic service life on the Gulf coast. Repair options and cost depend on which of the six is up there and how far through its life it is, so the survey identifies the assembly before it prices anything.

SystemRealistic service life hereWhere it is rightWhere a repair holds
TPO single ply15 to 25 yearsNew buildings, warehouses, most retailWhen the field sheet is sound and the failure is at a seam, lap or penetration
EPDM rubber20 to 30 yearsOccupied buildings, low foot trafficWhen taped seams have aged out but the field membrane is still supple
Modified bitumen15 to 25 yearsBuildings with rooftop plant and regular foot trafficWhen a cap sheet section has failed and the base sheet is still sound
Built up (BUR) with gravel20 to 30 yearsOlder commercial and industrial roofsWhen flashings and drains have failed rather than the field of the roof
Standing seam metal30 to 50 yearsLong span buildings and canopies, sometimes retailWhen a fastener line, a valley or a penetration has failed
R panel metal20 to 40 yearsWarehouses, workshops, agricultural buildingsWhen exposed fastener washers have aged out and the panel is still sound

Estimated ranges, not quotes, and none is a specification. Assembly, area and access move all six bands, and a survey settles which repair route is honest against a full re roof or a coating on top. Call (504) 800-8196 and we will identify the assembly and put the fix and the price in writing.

Which office and which code cover a commercial roof here

The 2025 Louisiana roofing law is usually described as a rule about houses. It is not. The statute has two limbs and a commercial building is on the other, which changes the code and the paperwork. Which office you file with depends on the city limit, and a downtown property can bring the Historic District Commission in.

What actually changed

Permit and inspect

La. R.S. 37:3737(I) requires every municipality and parish that issues construction permits to permit and inspect roof construction and re roofing. That covers commercial and residential structures alike. The requirement came in through Act 239 of 2025 and the framework was moved to its current chapter by Act 881 of 2026.

Your building is on the commercial limb

IBC Chapter 15

Subsection (I)(1) sends every building other than a one and two family dwelling to International Building Code Chapter 15, as adopted by the Louisiana State Uniform Construction Code Council. Only (I)(2), the houses, goes to the residential code. Louisiana moved to the 2021 editions with state amendments on 1 January 2023.

Inside the city limits

City of Gretna

The City of Gretna Building Department at 740 2nd Street handles permits inside the limits, on 504.363.1563. The general commercial fee schedule is set in the municipal code and confirmed at the counter for a specific scope of work.

Outside the city limits

Jefferson Parish

The parish handles unincorporated area permits, and a commercial reroof runs through the general Jefferson Parish commercial permit route rather than a roofing line. The parish publishes no commercial roofing rate we could verify, so pricing is confirmed at the parish counter when the application is submitted.

A downtown property can bring the Historic District Commission in

Gretna's Historic District Commission reviews any exterior change visible from public right of way on a property inside the local historic district. On a low slope commercial roof that mostly does not apply, because a flat roof is rarely visible from the street. Where it can apply is a storefront with a visible mansard, a facade-facing coping change, or rooftop equipment that shows above the parapet from the corridor.

The rule is one line on the City Building Department page and it reads broadly, so a downtown property that sits inside the local district is worth confirming with the office before the scope is fixed. The Historic District Commission and the Building Department are in the same building at 740 2nd Street, which keeps the sequence short: the Certificate of Appropriateness is settled before the building permit is issued, and both live at one address rather than two.

A repair that is entirely on the field of the roof and not visible from public right of way normally sits outside the visibility test, but that is a question for the City rather than a call we can make on your behalf. If any part of the scope changes what a passer by can see, raise it at the start.

The 25 percent rule is a Florida rule and it is not what triggers an upgrade here

It comes up on commercial work constantly, usually from an owner who has read that repairing more than a quarter of the roof forces a full replacement. That idea comes from Section 706 of the Florida Building Code, Existing Building, which carries its own conditions and applies in Florida. Louisiana is on the International codes and has no equivalent percentage trigger.

What decides it on a commercial roof here is the scope of work and the permit itself. Once the office issuing the permit classes the job as a re roof it is permitted and inspected on the Chapter 15 route, whatever fraction of the area that happens to be. The useful question is not what percentage you are replacing, it is whether the office is going to class the work as a re roof, and that is answerable before you start.

There is a real percentage rule the state does carry, and it catches people out because it sounds like the Florida one. Under federal flood requirements adopted locally, work counts as substantial improvement once its cost reaches 50 percent of the market value of the structure, for buildings inside a Special Flood Hazard Area. That is a federal flood rule rather than a roofing rule, it measures the value of the work against the value of the building rather than the area of the roof, and it only applies in the flood zone. On the west bank a lot of the Gretna commercial area falls inside a flood zone, so if the building sits in a Special Flood Hazard Area settle where the work stands against that threshold with the office that permits the building before the scope is fixed rather than after.

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What fails first on a west bank commercial roof

Three patterns come up on low slope roofs in a Gulf coast climate on the west bank of the Mississippi. Each one is a reason a previous repair did not last, and each is fixable, but only if the thing causing it is fixed at the same time rather than patched over.

Standing water on a roof that never had the fall it needed

A low slope roof is not a flat roof, and the difference is drainage. Where a deck has settled, an insulation layer has compressed, or a drain sits slightly proud of the surface, water stops moving and stays. In sustained Gulf heat that pond then cooks the membrane above it, and a seam that might otherwise have had years left in it can go early.

The tell is a dark ring on the membrane that is still visible when the roof is dry. A repair inside that ring without correcting the fall is a repair with a known expiry date, so we price the drainage correction beside the patch and let you choose with both numbers in front of you.

Wind uplift on a west bank building without the intervening bulk

A Gretna commercial building sits closer to open water than most of the metro, with less intervening bulk between it and a storm track that comes off the Gulf. On a low slope roof that is not primarily a covering question, it is a peel edge question: parapet flashings, coping details and the perimeter fields of the membrane are where wind uplift finds a start.

That is where a repeat storm repair is worth having done once rather than twice. A coping cap re fastened on a proper pattern, a peel edge repaired back to the deck rather than surface patched, and the perimeter membrane fasteners re set into sound decking are the details that hold the next storm. The interior field of the roof is usually the least urgent thing on the survey after a wind event.

Rooftop equipment growing on a roof that was not scoped for it

A lot of west bank commercial buildings have taken more rooftop plant over their life than the original scope allowed for: HVAC units added, condensers replaced with heavier ones, kitchen exhaust cut in later. Each of those is a penetration or a curb the original roofer did not detail, and each is a potential leak path.

The tell is a repeat drip that only shows up in certain wind directions or after a specific run of hot days. On the survey we walk every curb and penetration rather than looking only at where the stain reports to, because a leak that repeats after a repair is usually somewhere the previous fix did not visit.

Big Easy Roofing Process

Four steps. The first two happen before anyone quotes a price, because on a commercial roof the expensive mistake is repairing the leak and leaving the reason for it, and the second is filing with the wrong office.

A roofer inspecting a flashing detail where a roof meets a wall
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01

Survey the assembly and the drainage

We identify the membrane and its age, walk the falls to find where water actually stands, check every penetration, curb, drain and parapet detail, and look for wet insulation under the membrane. You keep the photographs whether or not you use us.

02

Settle which office covers the address

We check the building against the city limit map so we know whether the permit goes to the City of Gretna at 740 2nd Street or to Jefferson Parish at its general commercial route. Where the property sits in the local historic district the Historic District Commission is raised at the same time.

03

Written scope, with the drainage priced separately

You get the defect named, the fix described and the price in writing, with any drainage or insulation correction priced as its own line so you can see what is a patch and what is a cure, and decide accordingly.

04

Repair, photograph, and keep you trading

Work is sequenced around your opening hours where it can be, noisy and disruptive stages flagged in advance, the finished detail photographed, and the site left clear. Call (504) 800-8196 to get the survey booked.

Everything else we do in Gretna

The rest of the Big Easy Roofing services available in Gretna, each with its own page, crew and written scope. Where a commercial roof is holding water after a repair, a coating or a full re roof is usually the next thing worth pricing, so ask us to compare the two on the same visit.

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