Recover the roof only when the roof below it has earned the right to stay.
A commercial roof recover can reduce tear-off, disposal and building disruption—but only when the existing assembly, moisture condition, roof deck, attachment, drainage, fire classification and wind design support another roof covering.
Repair, restoration, recover and replacement are four different scopes.
Calling every reroof alternative a “coating” or every new membrane a “replacement” hides critical differences in what remains, what is removed and what must carry the new roof.
Repair
Corrects defined defects while most of the existing roof remains unchanged.
Open Commercial RepairRestoration / coating
Renews an eligible existing roof with a compatible liquid or restorative system. It is not automatically a new roof covering.
Open Restoration AuthorityRecover
Adds another roof covering over a prepared existing roof covering while leaving qualifying existing materials in place.
Use Recover QualificationReplacement
Removes the existing roof covering, repairs the substrate and installs the new roof assembly.
Compare ReplacementFour conditions can eliminate the recover option before membrane selection begins.
The lowest-price recover proposal can become the most expensive scope if these conditions are assumed instead of investigated.
Too many roof applications
The current Florida code generally requires removal when two or more roof-covering applications already exist.
Water-soaked or deteriorated roofing
Widespread moisture or deterioration can make the existing roof unacceptable as a base for another covering.
Attachment cannot be proven
If the existing roof is expected to support or anchor the new system, its securement must satisfy the applicable design pathway.
Unsuitable substrate or details
Blisters, unstable surfacing, insufficient flashing height, deteriorated deck or incompatible materials can require corrective removal.
Answer five questions before discussing a membrane.
Six recover paths can look similar from the parking lot and behave very differently on the roof.
The selected membrane is only one part of the system. Substrate, separation layer, board attachment, adhesives, fasteners, wind zones, flashings and existing-roof conditions determine whether the recover is defensible.
A recover is a decision about what you are willing to bury.
Once the new roof is installed, the old membrane, insulation, deck and prior repairs are harder and more expensive to access. The investigation should be proportional to that risk.
Moisture mapping + verification
Use an appropriate non-destructive survey where useful, then verify representative conditions with cores or other invasive methods. Define wet-area limits before the scope is locked.
Core samples + layer count
Confirm membrane type, number of roof applications, insulation, cover boards, vapor retarders, attachment and deck instead of relying on surface appearance.
Deck + pullout testing
Metal, concrete, gypsum, TECTUM, LWIC and wood decks can require different attachment evaluation, fasteners and field testing.
Existing membrane securement
Bonded recover systems may rely on the existing membrane and insulation attachment. Mechanically attached recovers may bypass the membrane but still depend on deck resistance.
Drainage + vertical clearances
Added insulation or cover board can reduce curb, wall, drain and flashing heights. Taper, overflow and discharge paths should be checked before materials are ordered.
Fire + compatibility
Separation layers, cover boards, existing asphalt, single-ply chemistry, adhesives and insulation can affect fire classification and manufacturer acceptance.
Recover rules become more prescriptive when the project is in Broward County’s High-Velocity Hurricane Zone.
The statewide code already establishes recover-versus-replacement gates. The HVHZ adds specific reroof testing and documentation provisions that can materially change how a recover is designed and priced.
Florida statewide baseline
- Recover materials and application methods must comply with the current roofing chapter.
- Tear-off is required where the existing roof is water-soaked or too deteriorated to be an adequate base.
- Tear-off is generally required where two or more roof-covering applications already exist.
- Blisters must be opened / corrected and remaining materials secured before additional roofing.
- If the existing roof is used for attachment, its securement must satisfy the applicable requirements.
Broward / HVHZ additional controls
- One additional roofing system may be applied over an original roof assembly only where the existing assembly complies with the reroof provisions.
- If the new recover is bonded to the existing membrane, the existing membrane is subject to uplift-resistance testing under TAS 124.
- Mechanically attached recover assemblies can require field fastener-withdrawal testing under TAS 105 and pull-over verification.
- The HVHZ includes explicit moisture limits and TAS 126 survey provisions for many existing membrane and rigid-insulation conditions.
- Product approvals, permit documentation and project wind pressures control the final assembly.
Recovering over specialty substrates requires more than a moisture scan.
Lightweight insulating concrete, poured gypsum and cementitious wood-fiber / TECTUM-type decks can change both moisture interpretation and fastener testing. Prior through-fastening can also reduce the dependable attachment surface that remains.
Lightweight insulating concrete
Confirm the underlying structural deck, LWIC type, thickness, density / strength, bond, cracking, erosion, moisture distribution and prior recover fasteners. Reuse is conditional—not automatic.
Gypsum / cementitious fiber
Identify the actual deck, deterioration, patching, specialty fasteners and withdrawal resistance. Do not confuse poured gypsum with a modern gypsum cover board.
Unknown or mixed construction
Additions, phased construction and prior reroofs can produce multiple deck families on one building. Investigate roof area by roof area rather than assuming one assembly everywhere.
Leaving the old roof in place saves demolition—but the new materials still add dead load.
This planning worksheet helps the property team see the magnitude of added material. It is not structural approval and does not determine whether the building can support a recover.
A recover can reduce tear-off cost while increasing hidden-condition risk.
The proposal should show where the savings come from and where the uncertainty remains.
| Cost / scope item | Recover | Full replacement | What should be controlled in the proposal |
|---|---|---|---|
| Tear-off & disposal | Reduced where existing materials qualify to remain. | Broader removal and disposal. | Define selective-removal unit prices and assumed wet-area quantity. |
| Moisture | Must be mapped so wet or unsuitable areas are removed. | More of the assembly becomes visible during tear-off. | State survey method, verification cores and change-order thresholds. |
| Attachment | Existing roof / deck may become part of the load path. | New assembly can be designed from the exposed deck. | Define pull testing, fasteners, board attachment and wind-zone enhancements. |
| Flashings & curbs | Added build-up can reduce usable vertical height. | Opportunity to rebuild details from the deck. | Identify curb extensions, drain work, wall flashings and equipment modifications. |
| Operations | Often less demolition, debris and interior exposure. | More demolition but fewer concealed existing-roof assumptions remain. | Separate temporary dry-in, interior protection, work hours and phased access. |
| Future reroof | The retained roof remains part of the building history. | Resets the roof assembly closer to the deck. | Document retained layers, repairs, cores, wet-area removals and as-built details. |
Real commercial roof conditions explain why recover decisions cannot be made from one surface photo.
These verified Aastro project images are used as condition and assembly evidence. They are not represented as photographs of the same recover project.
Answer seven questions. We’ll route the property to the next responsible step.
The recommendation is a screening direction—not engineering, a moisture survey, product approval or manufacturer warranty authorization.
Send the roof context with the inquiry.
If you choose to include your planner answers, they can be included with your project request so the Aastro team sees what you were researching before contacting you.
Request a commercial recover evaluation
Submitting this form opens a pre-addressed email to Aastro Roofing. Send that email to complete your request. For immediate service, call 561-409-3280.
A recover proposal should price the unknowns before they become change orders.
Selective removal allowance
State the included wet-area or damaged-area allowance, unit price beyond it, disposal, replacement insulation and deck-repair boundaries.
Attachment testing
Identify pull testing, deck type assumptions, fastener / plate system, board attachment and how additional attachment is priced if field results differ.
Drainage and curbs
Define tapered insulation, cricket work, drain extensions, curb extensions, wall flashing height and overflow modifications.
Existing roof preparation
Define gravel removal, blisters, patches, incompatible coatings, primers, separation layers and surface leveling.
Wind-zone enhancements
Field, perimeter and corner attachment may differ. The proposal should reflect the tested or approved assembly rather than one uniform pattern.
Warranty pathway
Manufacturer eligibility, inspection, approved components and maintenance obligations should be written as project-specific conditions—not assumed from a brand name.
Commercial roof recover FAQ
What is a commercial roof recover?
A roof recover installs an additional roof covering over a prepared existing roof covering without removing the existing roof covering. It is different from a coating restoration and different from a roof replacement that removes the existing roof covering.
Can every commercial roof be recovered?
No. Existing moisture, deterioration, multiple existing roof applications, blisters, inadequate attachment, structural concerns, drainage limitations, fire classification, incompatible substrates or project-specific product-approval requirements can make tear-off or major correction necessary.
How many existing roof layers can remain?
The current Florida Building Code generally requires removal when the existing roof already has two or more applications of roof covering. Exceptions, system-specific approvals and High-Velocity Hurricane Zone requirements must be verified for the actual assembly and permit jurisdiction before a recover is specified.
Why is a moisture survey important before a recover?
A recover can conceal conditions that become expensive after work begins. Moisture mapping and verification help define wet-area removal, determine whether the existing roof is an acceptable base and reduce the risk of trapping widespread moisture beneath the new assembly.
Does a roof recover automatically improve wind performance?
No. The recover assembly must meet project wind pressures through the tested or approved assembly. Existing attachment, deck condition, fastener withdrawal, adhesive bond, perimeter and corner design and edge systems can all control the result.
What changes in Broward County?
Broward County is within Florida’s High-Velocity Hurricane Zone. Recover work there can require additional uplift, withdrawal, moisture, product-approval and permit documentation, including TAS 105, TAS 124 or TAS 126 pathways when the selected assembly and existing roof conditions trigger them. The actual test plan is project-specific.
Can a recover be installed over gravel BUR?
Potentially, but the existing roof must first qualify. In the HVHZ, a mechanically attached recover base or anchor sheet cannot be fastened directly over existing gravel unless the gravel is completely removed. Manufacturer preparation requirements may be more restrictive.
Is fleece-back TPO or PVC used for recover projects?
Yes. Manufacturers offer fleece-back single-ply products for qualified reroof and recover applications. The substrate, moisture, attachment method, cover board or separation layer, adhesion testing and project-specific approved assembly still control.
Can modified bitumen be used as a recover?
Certain modified-bitumen products and vented membranes are designed for recover applications over qualifying existing roofing. Existing roof identification, preparation, attachment, moisture, fire and wind requirements remain project-specific.
Does a recover eliminate all tear-off?
Not necessarily. Wet, deteriorated, detached, blistered or otherwise unsuitable areas may still require selective removal. Perimeters, curbs, drains, penetrations and transition areas may also require localized demolition and rebuilding.
Will a white recover membrane lower energy bills?
A reflective surface can reduce solar absorption and roof-surface temperature, but it is not insulation and does not guarantee utility savings. Total performance depends on insulation, air leakage, HVAC, interior loads, roof area and operating conditions.
What should a commercial recover proposal include?
The proposal should define the existing assembly, number of roof layers, moisture investigation, selective removal assumptions, substrate and deck conditions, attachment testing, new system, insulation or cover board, drainage corrections, perimeters, penetrations, wind zones, unit prices, change-order controls, warranty path and closeout documentation.
Primary references used for this website page
Reverify code edition, product approvals, system details and manufacturer eligibility immediately at project specification and warranty-registration time.
- 2023 Florida Building Code, Building — Chapter 15, Existing Roofing and HVHZ Reroofing
- 2023 Florida Building Code, Existing Building — Section 706
- GAF — Commercial Roof Recovers / Fleece-Back guidance
- Johns Manville — Recover boards and commercial insulation / cover boards
- Mule-Hide — TPO Fleece Back reroof / recover applications
- SOPREMA — COLVENT recover membrane
- Florida Building Commission — current code resources
- Florida Product Approval search
- Miami-Dade Product Control search / HVHZ approvals
The best recover is the one that survives the investigation before it reaches the proposal.
Aastro can identify the existing roof, map moisture, review the deck and attachment, compare recover against replacement and define the next responsible step for the property.