FORTIFIED Roof Without Replacing Your Roof

Whether your roof qualifies

IBHS calls this the Existing Roof path, and it has a short list of conditions. Every one of them has to hold.

• Your roof still has real life left in it. The test is not how old the roof is. IBHS asks whether the covering has roughly five years or more of useful life remaining, judged on the type of roof, its age, its condition, and any visible wear or corrosion. A twelve-year-old architectural shingle roof in good condition can pass this. A six-year-old roof that took a beating may not.
• No visible damage or deterioration.
• One layer of roofing, not two. If an older covering was left in place and roofed over, this path is closed. FORTIFIED does not accept layovers, and requires the old covering to come off before a new one goes on.
• A plywood or OSB deck. Homes with wood plank decking cannot use the spray foam method at all. Boards move with the seasons, and the foam cannot hold a permanent bond across gaps that open and close.
• An attic you can reach, all of it. The installer has to get to the entire underside of the deck. Low eaves, ductwork, an air handler, or a finished attic ceiling can block exactly the areas that matter, and any section the foam cannot reach has to be sealed another way.
• A drip edge already installed.

A certified FORTIFIED evaluator makes the actual call. This list is what they check against, not something you can settle from the ground.

How the work is done

The crew works from inside the attic. They lay a bead of two-part closed-cell spray polyurethane foam, one and a half to three inches wide, along every seam between the deck panels, along every place the deck meets a rafter or truss, and up all the valleys.

That single application does two things the FORTIFIED standard asks for separately. It seals the deck against water, and it bonds the panels to the framing so wind cannot pull them off.

The product has to be tested and rated to hold at least 110 pounds per square foot of uplift. Your evaluator will want a letter from the installer naming the product, the manufacturer's documentation, and at least four photographs taken from four different parts of the attic showing continuous coverage. There is no way to judge cured foam by looking at it, which is why the paperwork matters as much as the work.

What it is worth

The certificate is what triggers the money, not the method you used to earn it.

A FORTIFIED Roof - Existing Roof certificate is a FORTIFIED Roof designation, so Louisiana's mandated wind discount applies to it. Under Regulation 136, the benchmark runs 16 percent in the North zone to 29 percent in the South zone, taken off the wind or hurricane portion of premium, and those benchmarks become mandatory January 1, 2027. Top carriers already file up to about 40 percent today.

Which carrier files what, and what the discount comes to in dollars, is worked through on the wind insurance discount page.

The state tax credit is keyed to the certificate the same way. It returns 100 percent of qualified costs, up to $10,000 per residence, for costs incurred on or after July 1, 2025, and it sunsets December 31, 2031.

Who can claim it, how the carryforward works, and how it interacts with a grant are covered on the FORTIFIED roof tax credit page.

Estimate the yearly discount

Put in the wind or hurricane portion of your premium and your zone. The number is the same either way you earn the designation, because the discount follows the certificate. It is a planning estimate, not a quote.

The grant question

On the Fortify Homes grant, LDI has not published an answer. Regulation 126 and the LFHP homeowner rules both require only that the work meet or exceed the IBHS FORTIFIED roof standard. Neither says whether the roof covering has to be replaced, and neither mentions this method either way. In practice your Home Evaluator determines which improvements your home needs to meet the standard.

So ask LDI and ask your evaluator before you assume it either way. Registration for the most recent round closed June 19, 2026 and LDI has said further rounds will be announced later, so there is time to get a real answer. Apply through the state at ldi.la.gov/fortifyhomes, not on this site.

What it costs

We do not publish a cost figure for this work, because there is no sourced Louisiana number for it and we will not invent one. For scale: a full FORTIFIED roof replacement runs about $16,229 at the documented median. This is a smaller and different job, priced off the size of your attic and how easy it is to move around in.

Anyone who quotes you a firm number before looking in your attic is guessing.