Decision guide
Coating wins when the deck is sound and wet insulation is limited; replacement wins when the substrate has failed. This guide gives you the checks that separate the two — before a salesperson picks for you.
1. Deck condition. The deck is the one component neither option can fake. Sound steel, concrete, or wood deck supports either path; corroded, rotted, or deflecting deck forces replacement (or a structural scope first), because a coating system is only as good as what it adheres to and is fastened through.
2. Moisture in the assembly. A moisture scan maps wet insulation precisely. Localized wet areas are cut out inside a restoration scope. Widespread saturation means the assembly itself has failed — coating over it seals water in and guarantees blistering, delamination, and a voided warranty. This single check decides more roofs than all the others combined.
3. How the roof is failing. Leaks concentrated at seams, flashings, fasteners, and drains describe detail failure on a sound field — the classic restoration case. General surface failure, membrane embrittlement across the whole field, and patches on patches describe a system at end of life, where restoration money buys little.
4. Count the existing roofs. Florida code and good practice limit roof assemblies; a building already carrying two roof systems generally cannot take another layer of anything. If yours is a second roof, the next project is a tear-off regardless of condition — better to know it during planning than during permitting.
5. The building's next ten years. Planned additions, rooftop equipment changes, a sale, or a refinance all change the right answer. A documented restoration strengthens a sale file; a building about to be reconfigured should not buy a 20-year system it will cut through in three.
Restoration plans at roughly a third to a half of replacement for the same building in South Florida — $2.50–$4.75 against $9–$15 per square foot for full restoration scopes. That spread is real only when the restoration bid includes the scan-verified prep: wet-area replacement, detail rebuilding, specified thickness. A coating bid at half the restoration price is not a bargain; it is the same job with the expensive lines deleted, and the roof will present the bill later.
Replacement's hidden line item is exposure: every day of tear-off is a day the building's weatherproofing is under construction during a Florida rain cycle. Occupied hospitals, schools, warehouses, and condos price that risk very differently from a vacant building. Coating's occupied, no-open-deck model is frequently worth as much as its price difference — a factor owners feel most clearly the first afternoon storm of a tear-off project.
There is no honest universal percentage — it depends on the stock being surveyed. In practice, a large share of roofs quoted for replacement prove to be restoration candidates once scanned, because leaks concentrate at details while the field and deck remain sound. Your roof's answer comes from its moisture scan and cores, not from statistics.
Work on a warranted roof should be coordinated with the existing manufacturer where that warranty still has term — in many cases the restoration system replaces the old warranty with a new manufacturer system warranty. Any existing warranty position should be checked and documented before work, not assumed away.
A tear-off removes the building's weather protection daily, generates noise, debris, and dumpster traffic, exposes the deck to afternoon storms, and frequently requires interior protection and schedule concessions. Coating eliminates the tear-off phase entirely — preparation and application happen on a closed, watertight roof throughout.
Yes — recoating at term is the standard lifecycle plan for both silicone and acrylic systems, at a fraction of the original installed cost, provided the roof has been maintained and inspected. This is the structural reason coating economics compound: the second cycle is cheap because the first was documented.
Hybrid scopes are common: failed sections are recovered or replaced while sound sections are restored, with transitions detailed properly between them. A section-by-section scan verdict produces a section-by-section scope — whole-roof decisions forced by partial-roof problems are usually a sales artifact, not an engineering one.
A documented restoration — scan records, product approvals, registered manufacturer warranty, maintenance file — answers the roof questions due diligence actually asks: condition, remaining life, and warranty standing. It compares favorably with an aging original roof even when the coating itself has years of term remaining.
When the deck has failed or deflected, when wet insulation is widespread rather than localized, when two roof systems are already stacked, or when the building is being reconfigured anyway. Replacement is also right when capacity or slope corrections are needed that coating cannot deliver. The scan identifies each of these factually.
Run your numbers in the cost guide and calculator, or read how a restoration scope is built.