Commercial Roof Coating in Gretna, LA

It is how thick the coating is once it has cured, measured in mils, which are thousandths of an inch. It matters because it is what the manufacturer writes the warranty against and what makes two quotes comparable. A quote that says two coats does not tell you what you are buying, because two coats of a thin product and two coats of a thick one are different roofs.

Because part of what goes on is carrier that evaporates. The share that stays is the volume solids, so a coating at 55 percent volume solids laid at 36 mils wet cures to about 20 mils dry. That is why a scope states the wet rate as well: it is what a gauge can check while the work is happening, before the film has cured.

A US gallon is 231 cubic inches, so at one thousandth of an inch it covers 1,604 square feet. Multiply that by the volume solids and divide by the specified dry film to get coverage per gallon. At 55 percent solids and 20 mils dry that is about 44 square feet a gallon, or roughly 2.3 gallons per hundred square feet.

Treat it as a ceiling rather than a plan. Datasheet coverage is theoretical and assumes a smooth surface with no loss. A granulated cap sheet, an aged porous surface or a windy day all take more, so a bid built on the theoretical figure alone tends to run short of material before it runs short of roof.

Put the specifications side by side rather than the totals. Ask each bidder for the product name, the specified dry film, the volume solids, the wet rate and what preparation is included. Quotes that look identical at the bottom line can turn out to be buying materially different quantities of material once those five lines are filled in.

Often because it is a thicker specification rather than a better brand. Manufacturers issue terms against a stated dry film and a stated preparation, and length can also turn on the system, the substrate and any inspection conditions attached. Compare the specifications before you compare the years, and ask what each term is written against.

For many systems, yes, and it is worth asking before work is booked rather than after. A manufacturer system warranty is often issuable only by a contractor approved for that system, and approval is not something that can be applied retrospectively to a roof that has already been coated.

That is a survey question and it is answered on the residential roof coating page rather than here. The short version is that a coating goes over a roof that is still sound and cannot rescue one that is not, so what is under the membrane decides it. Wet insulation is the usual disqualifier, and how it is found is covered on the commercial roof inspections page.

A coating over a covering that stays in place is maintenance rather than the re-roofing that La. R.S. 37:3737(I) makes permitted and inspected, so it is normally outside it. Where the scope turns into a re-covering the position changes, and which office covers the address depends on whether the building sits inside the Gretna city limits or in the unincorporated parish. Inside the historic district a Certificate of Appropriateness is a separate step where the finish is visible from public right of way. We confirm it before starting rather than assuming either way.

Neither the City of Gretna nor Jefferson Parish publishes a roofing specific permit line, so the fee follows the scope. Inside the Gretna city limits it is filed through MyGovernmentOnline (mgoconnect.org) with the Building Department at 740 2nd Street, and the fee is set in the municipal schedule against the classification of the work. Outside the limits, the parish permits office sets the fee on scope in the same way. The commercial roof repairs page carries the same fee route in full.