Roof Recover Overlay

Roof Recover and Overlay for commercial buildings across Miami.

Most commercial roof replacements in Miami-Dade get scoped reactively. The roof leaks after a king-tide event, or a tropical storm exposes failed perimeter flashings, and someone calls three contractors for bids. The lowest bid wins, the new membrane goes on the same insulation against the same parapet detailing — and then leaks again in two years. We do not work that way.

Our replacement scope starts with a roof walk and a moisture-core pull on any roof we suspect has saturated insulation from chronic water intrusion. We document deck condition, parapet flashing condition, drain status, every penetration, and every prior repair. The replacement scope then specifies the membrane (with its Miami-Dade Notice of Acceptance number), the insulation stack compliant with Florida Energy Code R-value requirements, the fastener density to FBC HVHZ wind-uplift design, the manufacturer warranty path, and the maintenance contract that keeps the warranty active.

Miami-Dade's product approval system matters in ways it does not in most other markets. If a roof assembly — membrane, insulation, fastener pattern, and adhesive system — does not have an active Miami-Dade NOA for the complete assembly as installed, the system is not code-compliant regardless of how well the individual components perform. We specify only assembly systems with current NOA approvals, and we document the approval numbers at closeout.

When Replacement Is the Right Call in South Florida

Recover-versus-replace is the first decision in any aging-roof scope. We pull moisture cores in five to ten representative locations on roofs we suspect have insulation saturation. If more than 25% of cores read wet, replacement is the honest scope — recovering wet insulation traps moisture, creates a perfect mold environment in Miami's humidity, and voids the new manufacturer warranty. If under 25%, a recover with targeted insulation replacement at wet areas can extend the asset another 15 to 20 years at roughly half the capital cost of full replacement.

Deck condition is the second decision. Corroded metal deck or rotted wood sheathing drives the project into a different cost band. In Miami's coastal humidity environment, deck corrosion on older pre-1992 buildings is more common than owners expect — especially on roofs that have had chronic water intrusion. We pull deck inspection ports under wet cores and at visible deflection points before the replacement scope is finalized.

FBC HVHZ compliance is the third decision. Any roofing system installed in Miami-Dade must comply with the Florida Building Code's High-Velocity Hurricane Zone requirements. The key variables are the fastener density in field, perimeter, and corner zones — the three zones that carry progressively higher wind-uplift design pressures per ASCE 7 and the FBC. Buildings close to Biscayne Bay or with open-exposure roof edges require more conservative perimeter fastening than inland buildings sheltered by adjacent structures.

What the Replacement Scope Specifies

Membrane and NOA: TPO 60-mil or 80-mil for most Miami commercial buildings — every manufacturer's TPO system we specify carries an active Miami-Dade NOA for the complete assembly. EPDM 60-mil for buildings with high mechanical traffic or specific owner preference. PVC 50-mil or 60-mil for restaurants and high-chemical exposure. Modified bitumen for buildings where the recover path makes cost sense and a compliant NOA-approved assembly exists. We do not install any assembly that lacks a current Miami-Dade product approval.

Insulation: We spec to Florida Energy Code minimum R-25 for low-slope commercial, often higher depending on building use and utility cost analysis. The stack typically runs polyiso primary insulation with a cover board — HD polyiso, gypsum board, or high-density polyiso depending on membrane manufacturer's installation requirements. Tapered insulation packages are designed against the existing drain layout and documented ponding patterns.

Fastener pattern: Designed against FBC HVHZ wind-uplift requirements using the ASCE 7 design pressure for the specific building, zone (field, perimeter, corner), and exposure category. Biscayne Bay waterfront buildings and rooftop edges with open exposure get the most conservative pattern. All fastener patterns are submitted as part of the Miami-Dade permit application.

Manufacturer warranty: 20-year NDL (no-dollar-limit) warranty is standard for most TPO and EPDM systems. PVC can carry 25-year warranties. The warranty path requires documented annual maintenance — we build that into every replacement closeout.

How We Sequence the Project

Pre-construction: Permits filed with Miami-Dade Building Department (or the relevant municipal building department for Coral Gables, Miami Beach, or other incorporated municipalities), pre-job meeting with the building's facility manager to set crane placement and material lay-down zones, tenant notification distributed, parking and ingress/egress plan documented. Miami-Dade's building department permitting timelines run 3 to 6 weeks for commercial roofing permits — we file early.

Production: Tear-off staged in 5,000 to 10,000 sq ft sections with same-day dry-in on each section, so the building is never exposed overnight. Miami's afternoon thunderstorm pattern from June through October means production work starts at 6 AM and dry-in is complete by 1 PM. Hurricane season (June 1 through November 30) requires heightened daily weather monitoring — we maintain emergency tarping materials on every active project during hurricane season.

Closeout: Punch walk with the building's facility manager and our project manager, manufacturer warranty inspection with the manufacturer's field representative, Miami-Dade final inspection and certificate of completion, closeout package delivered — warranty document, NOA approval documentation, photo-keyed zone diagram, maintenance contract.

Frequently asked questions

What is a Miami-Dade NOA and why does it matter for my roof replacement?

NOA stands for Notice of Acceptance — Miami-Dade County's product approval process for building materials used in the High-Velocity Hurricane Zone. Every roofing assembly installed in Miami-Dade must have an active NOA that covers the complete system as installed: membrane, insulation type, attachment method, and adhesive or fastener system. If a contractor installs a system without a current NOA — even if the individual components are high quality — the installation is not code-compliant and will fail Miami-Dade final inspection. We specify only NOA-approved assembly systems and document the approval numbers in the permit application and closeout package.

How long does a Miami commercial roof replacement take?

For a 50,000 sq ft single-story commercial building with no deck replacement and no major structural issues: approximately 3 to 4 weeks of production from tear-off through closeout, assuming no hurricane weather delays. Add 3 to 6 weeks for Miami-Dade permitting before production starts. During hurricane season we build weather contingency into every production schedule.

Will my building be exposed to rain during the replacement?

No. We tear off only what we can dry-in the same day. During Miami's summer rainy season (June through September), we structure production phases to reach same-day dry-in before the typical 2 to 3 PM afternoon thunderstorm window. Each section gets a temporary dry-in — single-ply membrane lap with mechanical fasteners — before the crew leaves for the day. We do not leave the building's interior exposed overnight.

Do you work on buildings in Coral Gables, Miami Beach, and other incorporated cities?

Yes. Coral Gables, Miami Beach, Hialeah, Doral, Opa-locka, and other incorporated municipalities each have their own building departments and permit processes, but all still operate under Miami-Dade's HVHZ requirements and product approval system. Our project managers are familiar with each municipality's specific permitting requirements and inspection schedules.

Get a written replacement scope for your Miami building.

Our project managers will walk the roof, pull moisture cores if the recover-vs-replace decision depends on them, and deliver a written scope detailed enough to bid against — with NOA numbers and wind-uplift design included.

Roof Recover and Overlay in Miami, FL is a code-compliant option when the existing roof membrane is structurally sound, the insulation beneath it is dry, and the building currently carries only one membrane layer. Most building codes based on the IBC allow a maximum of two total membrane layers on a low-slope roof. Before any roof recover and overlay work begins in Miami, we require a moisture scan — infrared or nuclear — to confirm that insulation saturation is below the threshold where a new membrane would trap retained moisture and compromise the new assembly from underneath.

Weight and structural load are the first technical checkpoint for roof recover and overlay. A recover assembly typically adds 1.5 to 3.5 pounds per square foot depending on cover board thickness, membrane weight, and insulation added for energy code compliance. For roof recover and overlay projects in Miami, the structural engineer of record or an existing load calculation must confirm that the deck and framing can carry the added weight before the specification is finalized.

Cost savings compared to full tear-off are typically 30 to 40 percent for a roof recover and overlay because tear-off labor, disposal fees, and debris management are eliminated. That savings is real, but only when the substrate genuinely qualifies. A roof recover and overlay installed over wet insulation, a deteriorated deck, or poor drainage will fail early and leave the owner with a tear-off bill on top of the failed recover cost. Commercial Roofing will not recommend roof recover and overlay unless the moisture scan and field assessment support it.

FM Global and UL ratings must be maintained through the recover assembly for properties where rated systems are required by the insurance carrier or lease terms. We review applicable ratings, confirm that the proposed cover board, insulation, and membrane combination maintains the required classification, and provide the specification documentation that the insurance carrier or property manager needs to confirm compliance after the roof recover and overlay is complete. Call or email to find out if your Miami roof is a candidate.

Questions Owners Ask

The roof must have only one existing membrane layer, a dry insulation assembly confirmed by moisture scan, adequate structural capacity for the added weight, and drainage that supports the new assembly's performance.

Infrared or nuclear moisture scanning maps wet insulation areas that must be removed and replaced before the recover membrane is installed. We will not recover over wet material regardless of cost pressure.

Typically 30 to 40 percent, primarily by eliminating tear-off labor and disposal costs. The savings are real but only when the substrate genuinely qualifies.

It can, if the specified cover board, insulation, and membrane combination is listed as a rated assembly. We confirm the rating classification before finalizing the specification.

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