Can You Put a Metal Roof Over Shingles in Florida?

What does the Florida Building Code say about recovering a shingle roof?

The Florida Building Code, Existing Building volume, Chapter 7, section 706 is the part of the code that addresses work on a roof that is already there. It distinguishes between a roof repair, a roof recover and a roof replacement. A recover means installing a new covering over the existing one without removing it. A replacement means removing the existing covering down to the deck and installing a new system. The distinction sounds academic until a plans examiner in Hillsborough or Orange County is reading the permit application. Section 706 permits a recover only in limited circumstances. The existing roof must have no more than one layer, the deck must be structurally sound, the existing covering must not be water-soaked or deteriorated to the point that it is unsuitable as a base, and the new covering must be one the code allows over the existing type. Metal shingles and metal panels are among coverings that the code contemplates going over asphalt in a recover, so the idea is not forbidden on its face. What changes the picture in Florida is that the same volume, at 706.1.1, contains the 25 percent rule. When more than 25 percent of a roof or a roof section is repaired, replaced or recovered within a 12-month period, the entire roof or section must be brought into compliance with the current Florida Building Code. A full recover is by definition 100 percent of the roof, so the current code applies to all of it.

Why does section 553.844 usually force a tear-off?

Florida Statute 553.844 is triggered by the reroof permit itself. Once the permit is pulled, the statute requires the roof deck to be re-nailed according to a prescriptive schedule and a secondary water barrier to be installed. For homes valued at $300,000 or more in the wind-borne debris region, it also requires a roof-to-wall retrofit when that work costs no more than about 15 percent of the reroof. These are not optional upgrades; they are conditions of the permit. Re-nailing the deck means driving ring-shank nails through the plywood into the trusses at the specified spacing. That cannot be done through a layer of asphalt shingles with any confidence, because the installer cannot see the truss lines, cannot verify the nails hit framing, and cannot document the pattern for the inspector. The secondary water barrier, a self-adhered membrane over the deck joints or a full self-adhered underlayment, must bond to the deck, and a shingle surface is not the deck. SB 4-D, from the May 2022 special session, amended 553.844 so that a roof built or replaced under the 2007 Florida Building Code or later, in effect since March 1, 2009, need only bring the repaired portion to current code rather than the whole roof. That relief applies to partial repairs on newer roofs. It does not change the deck re-nailing and secondary water barrier obligations on a full reroof, and it is SB 4-D, not SB 4-A, that made the change.

What are the three underlayment options on a Florida reroof?

The FBC 8th Edition, in effect since December 31, 2023, unified the steep-slope underlayment rules under R905.1.1 in the Residential volume and 1507.1.1 in the Building volume. There are three compliant paths, and every one of them starts from a bare deck. The first is a full-deck self-adhered underlayment meeting ASTM D1970, which doubles as the secondary water barrier required by 553.844 and is the most common choice on Gulf coast reroofs from Tampa to Naples. The second path is self-adhered strips at least 3.75 inches wide over every deck joint, followed by a conventional underlayment over the whole deck. The strips satisfy the secondary water barrier, and the underlayment above them provides the field protection. The third path is a two-ply mechanically attached system using ASTM D226 Type II or ASTM D4869 Type III or IV felt, fastened with one-inch cap nails at 12 inches on center. Where the design wind speed reaches 170 mph, as it does in Collier County and the Keys, the cap nails must be metal rather than plastic. None of these can be executed over shingles. Self-adhered membranes need a clean, dry deck to bond, and cap nails must penetrate the deck at a known spacing. This is a second, independent reason the recover option collapses in Florida even when section 706 might allow it in the abstract.

Are there any Florida situations where a recover still makes sense?

Occasionally. A home reroofed recently under the 8th Edition, with a documented re-nailed deck and a self-adhered secondary water barrier already in place, might qualify for a recover under section 706 if the shingles are a single layer, sound and dry. In that scenario the 553.844 work has already been done and documented, and the plans examiner may accept the new metal over the existing shingles. The catch is that a roof that new rarely needs replacing, so the case is uncommon. The 9th Edition of the Florida Building Code, drafted from the 2024 I-Codes, was posted on December 22, 2025 and takes effect December 31, 2026. It codifies recovers over adequate rigid insulation and elastomeric coatings, largely for low-slope commercial work, and raises design wind speeds in the Panhandle while leaving the peninsula largely unchanged. It does not loosen the 553.844 deck and barrier requirements, so the practical answer for a shingle-roofed house in Pensacola or Panama City stays the same after the transition. Where a homeowner is told that a recover will avoid the permit, the conversation should end. A reroof in Florida requires a building permit, the permit triggers 553.844, and work done without one is discovered at the next sale, the next wind mitigation inspection, or the next claim. The installer assigned through Metal Roofing Florida pulls the permit under their own DBPR roofing license and will not propose an unpermitted recover.

What should a Florida homeowner expect from a metal reroof instead?

The honest sequence for a shingle-to-aluminum reroof in Florida is tear-off, deck inspection, deck re-nailing, secondary water barrier, underlayment, then the panels. The tear-off usually takes a day on a typical Central Florida block home, and the deck is exposed only as long as it takes to inspect and re-nail it, with the self-adhered barrier going on the same day where the weather allows. Because the wet season brings afternoon storms, the installer sequences the work so the deck is never left open overnight. Deck inspection is where surprises appear. Rotted plywood around a chimney in a Daytona Beach house, delaminated sheets near the eaves in Fort Myers from years of wind-driven rain, or an undersized deck on an older Panhandle home all get replaced before the new roof goes on. This is exactly what a recover would have hidden, and it is why the code and the statute are built the way they are. Once the deck is sound and sealed, the aluminum profiles approved under NEMO P.E. Evaluated FL7263-R7, the Shingle, Slate, Diamond, Shake and Hidden-Fastener Tile patterns, go on with concealed fasteners at the schedule the approval sets for the site's design pressure. Standing seam is not in the Florida approval and is not offered on Florida permits. The design pressures run from -30.0 to -187.5 psf by profile and fastening, and the installer matches them to the ASCE 7-22 wind speed for the county, roughly 130 to 140 mph across North Florida and 150 to 160 around Tampa Bay. Metal Roofing Florida's role is to supply the roof, made by Interlock Roofing, and to certify and assign the installer; the roof carries the Guardian Lifetime Limited Material Warranty, issued by Interlock Roofing, with warranted wind resistance of 120 mph when installed to manufacturer specification. It does not install and does not pull permits. Miami-Dade and Broward, the High-Velocity Hurricane Zone, are not served. Everywhere else in the state, the roof that goes on after a proper tear-off is one the homeowner should not have to take off again.

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