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Home/Service Areas/Louisiana/Hammond/Commercial Roof Coating

Commercial Roof Coating in Hammond, LA

Big Easy Roofing coats commercial roofs across Hammond and Tangipahoa Parish. Two coating quotes at the same price per square foot can be two different products at two different thicknesses. The number that separates them is the dry film, and it is the line a quote can most easily leave out.

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Dry film milsWhat you are buying
City or parishPermits a reroof
1,604 sq ftPer gallon at one mil
WarrantyWritten on thickness

Hammond commercial roof coating at a glance

A commercial coating is a liquid membrane applied over a roof that is still sound. It is specified on dry film thickness in thousandths of an inch, not on how many coats go on, because thickness is what the manufacturer writes the warranty against and what makes two quotes comparable to each other.

What you are buying

Dry film mils

A mil is one thousandth of an inch. The scope names the dry film the finished system has to reach, and everything else on the quote is a means of getting there. Two coats of a thin product is not the same purchase as two coats of a thick one.

Who issues the permit

City or parish, by boundary

A coating applied to a sound existing roof is maintenance rather than the re-roofing that La. R.S. 37:3737(I) covers, so it is normally outside the permit. Where a job turns into a re-covering, the office at file is the City of Hammond Building Department at 219 E Robert Street inside the city limits, or Tangipahoa Parish permits outside them, and we confirm the position before starting.

The constant behind it

1,604 sq ft

A US gallon is 231 cubic inches, so spread one thousandth of an inch thick it covers 1,604 square feet. A theoretical coverage figure on a datasheet comes from that number reduced by the volume solids and the specified thickness.

Mils, not coats

The comparable number

A quote reading two coats states nothing you can check. A quote reading a named product at a stated dry film, with the volume solids and the wet rate, can be put beside another one and actually compared.

What the warranty rides on

Thickness and prep

Coating manufacturers issue warranty terms against the specified dry film and the surface preparation, and frequently against an approved applicator as well. Term length can turn on the system, the substrate and the inspection conditions too, so ask what a given term is written against rather than reading the years on their own.

The figure to distrust

Theoretical coverage

Datasheet coverage assumes a smooth surface and no loss. A granulated cap sheet, a porous aged surface or a windy application all take more than the sheet says, so treat it as a ceiling rather than as a plan.

A coating quote is one of the least comparable documents in commercial roofing. Two bidders can put almost the same price per square foot on the same building and be offering different products at different thicknesses over different amounts of preparation, and nothing on either page tells the reader which is which. That is not usually dishonesty. It is that the one number that would settle it, the dry film thickness the finished system has to reach, is not a number either side has been asked for.

So this page is about the arithmetic rather than about whether your roof should be coated. Big Easy Roofing writes a commercial coating scope naming the product, the specified dry film, the volume solids, the wet rate that produces that dry film and the preparation, and the reason all five appear is that any one of them missing makes the other four unverifiable. Whether the roof is a candidate for a coating at all is a different question, answered by a survey and set out on our Hammond roof coating page, and finding wet insulation before anything is specified is covered on the commercial roof inspections page.

Dry film, wet film and what a gallon actually covers

The whole calculation runs off one constant. A gallon spread at one thousandth of an inch covers 1,604 square feet, so dividing that by the specified dry film and multiplying by the volume solids gives the coverage. Worked here at 55 percent volume solids, which is a common figure rather than a universal one.

Specified dry filmWet film neededTheoretical coverageGallons per 100 sq ft
15 mils dryAbout 27 mils wetAbout 59 sq ft per gallonAbout 1.7 gallons
20 mils dryAbout 36 mils wetAbout 44 sq ft per gallonAbout 2.3 gallons
25 mils dryAbout 45 mils wetAbout 35 sq ft per gallonAbout 2.8 gallons
30 mils dryAbout 55 mils wetAbout 29 sq ft per gallonAbout 3.4 gallons
A quote reading two coatsNot statedNot statedCannot be worked out

Worked at 55 percent volume solids, so a product at a different solids content gives different figures and the datasheet governs. These are theoretical coverages on a smooth surface with no loss, and a real roof takes more, which is why they are a ceiling rather than a plan. No row here is a recommendation: the right dry film comes from the system and the manufacturer, not from a table. Call (504) 800-8196 for a scope with the thickness, the solids and the wet rate written into it.

What the warranty rides on, and who permits the work

A coating warranty is issued against the specification rather than against the brand on the pail, so the thickness and the preparation decide the term. The permit position is separate and follows whether the covering is being replaced, which on a coating over a sound roof it is not.

Warranty term

Rides on the spec

Manufacturers write the years against a specified dry film and a stated preparation, among other conditions. Two quotes offering different terms can be the same chemistry at two thicknesses, so compare the specifications before comparing the terms.

Approved applicator

Often a condition

Many coating warranties are issuable only by a contractor the manufacturer has approved for that system. It is worth asking early, because it is not something that can be added after the roof is coated.

Who issues the permit

City or parish, by boundary

For an address inside the Hammond city limits, the City of Hammond Building Department on (985) 277-5655 files through MyGovernmentOnline. For an address in the unincorporated part of Tangipahoa Parish, the Tangipahoa Parish Permit Office on (985) 542-2117. A Hammond postal address covers both, so the boundary decides which office, not the postmark.

How the fee is set

On scope

Hammond publishes a commercial Renovation/Repair/Roofing permit line at $50 up to $10,000 of value and then $5 per thousand above, as printed on the City permit application and as of September 2026. Whether a coating engages that line at all is a question for our Hammond commercial re-roofing page, which sets out the code test, and confirmed with the office at file before the scope is priced.

Is a coating a reroof

It depends on what is being done, not on what the invoice calls it. La. R.S. 37:3737(I), added by Act 239 of 2025 and now carried in Title 37 after Act 881 of 2026 repealed the old codification at R.S. 40:1730.21 to 40:1730.40.2, makes a reroof a permitted and inspected job in Louisiana. A coating applied over a covering that stays in place is maintenance rather than a covering replacement, so it is normally outside that.

The line is not always obvious, though. A scope that starts as a coating and grows to include the covering underneath crosses from maintenance into a re-covering, which is where the reroof rule engages. The code test for what counts as a recover is set out on our Hammond commercial re-roofing page, and where a job turns that corner we confirm the position with the office covering the address before it starts.

What the fee looks like when one is needed

Where a re-covering scope engages a City of Hammond permit, the fee sits under the commercial Renovation/Repair/Roofing line on the permit application: $50 up to $10,000 of value and then $5 per thousand above, as of September 2026. The City publishes the line but not a coating specific rate, so the fee follows the scope. Confirm the current figure with the Building Department on (985) 277-5655 before quoting.

Tangipahoa Parish handles unincorporated addresses through its own permit office at (985) 542-2117, and its published fee schedule prices Renovations by fair market value rather than by trade, so a reroof there is filed under that line. Whichever route applies, starting work before a required permit is signed is a doubling of the fees plus a stop work order under the City ordinance, so the check is worth making before the crew is on site.

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Cure and heat cycling on an inland Tangipahoa commercial roof

Three conditions on an inland Tangipahoa commercial roof decide whether a coating reaches its datasheet properties, and none is about the product. How wet the surface is when the film goes on, whether the film gets a dry spell to cure in, and how much the assembly under the coating moves each day.

The cure window is a scheduling problem

A water dispersed coating gives up its water to the air, so it needs a dry spell to cure to the properties on its datasheet. Rain on a film that has not cured can wash it, and the roof does not tell you afterwards, so a schedule that ignores the forecast is buying a risk it has not priced.

The practical answer is staging: the roof is coated in sections around the forecast rather than in one pass against a fixed date. Storm bands moving up from the coast reach inland Tangipahoa on hours notice at some times of year, so staging is the norm here rather than the exception.

Heat cycling is what the coating has to survive

A dark low slope roof in this climate moves through a wide temperature range every day, and the assembly under the coating expands and contracts with it. That movement is why the details, the seams, curbs and drains, are the places the film sits thinnest and works hardest, and why the whole reinforcement story lives on our commercial elastomeric coatings page.

On this page the point is smaller: a thicker film is a thicker film after heat cycling too. The mils the warranty rides on are the mils the roof has to give up to the sun before the coating stops doing its job.

Substrate moisture is the survey question

A coating over wet insulation is money spent on a roof that has already failed. The moisture in the assembly cannot dry through a new membrane, so the coating traps it and shortens what is above and below it in the same act. This is why the commercial roof inspections page owns the moisture survey and this page routes that question there rather than answering it.

The practical answer is that a survey happens before a coating is specified, not after. Where wet areas are found they come out before the coating goes on, or the scope changes to something other than a coating, and either answer is more honest than a warranty written over a wet deck.

Big Easy Roofing Process

A commercial coating is specified before it is priced, because the thickness and the preparation are what the price is a consequence of. Four steps, and the written scope at the end names every number on this page.

Roofer measuring coating thickness on a commercial low slope roof
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01

Survey the roof first

The roof is walked and assessed before any product is named. If the insulation is wet or the covering has failed, the honest answer is not a coating, and we say so at this stage rather than after the pails are on site.

02

Name the system and the dry film

The scope states the product, the specified dry film thickness the finished system has to reach, the volume solids and the wet rate that produces it. Those four lines are what make the quote checkable against anybody else.

03

Prepare, then apply in stages

Cleaning, repairs and primer where the substrate needs it, then the coating applied in stages with the wet film measured as it goes on rather than counted in coats.

04

Hand over the numbers

The finished job is documented against the specification it was written to, so the thickness the warranty rides on is recorded rather than assumed.

Everything else we do in Hammond

The rest of the Big Easy Roofing services available in Hammond, each with its own page and written estimate. This page covers how a commercial coating is specified. Whether your roof is a candidate at all is answered on the residential roof coating page, and finding wet insulation on the commercial roof inspections page.

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