Commercial Flat Roof Replacement
Complete low-slope roof assemblies for condominiums, multifamily communities, high-rise buildings, retail, offices, hospitality, warehouses, industrial facilities and institutional properties throughout Palm Beach and Broward Counties.
A Commercial Flat Roof Is an Operating Asset, Not Just a Membrane
The replacement strategy must account for occupants, operations, equipment, drainage, moisture, thermal performance, future service access, capital planning and the complete approved roof assembly.
What does commercial flat roof replacement include?
Commercial flat roof replacement means investigating and rebuilding the low-slope roof as a coordinated system. The scope may include tear-off or approved recovery preparation, structural deck work, vapor control, insulation, tapered drainage, cover board, attachment, membrane or asphaltic plies, walls, curbs, penetrations, perimeter metal, drains, testing, inspections and closeout records.
Select the Complete Assembly—Then Verify the Exact Approved Configuration
This authority owns replacement strategy and assembly coordination. The child authority pages own deeper membrane, chemistry, application and repair details.
Twelve Coordinated Elements Control the Replacement
The visible membrane or cap sheet is only one layer. Every proposal should identify the complete tested or approved assembly.
Existing-Roof Investigation
Records, layers, cores, moisture, repairs, leaks, drainage and assumptions.
Removal or Recovery Preparation
Tear-off limits, surface preparation, temporary dry-in, disposal and safe production zones.
Structural Deck
Concrete, steel, wood, gypsum, tectum or another approved substrate and its condition.
Air and Vapor Control
Interior humidity, deck temperature, vapor drive, air leakage and condensation risk.
Insulation
R-value, layers, joints, facer, compression, thermal bridges and code requirements.
Tapered Drainage
Slopes, crickets, saddles, sumps, drains, scuppers, overflows and flashing heights.
Cover Board
Puncture resistance, traffic, fire, hail, adhesion, dimensional stability and protection.
Attachment
Fasteners, plates, adhesives, induction weld, hot asphalt or approved hybrid method by zone.
Membrane or Plies
Exact product, thickness, reinforcement, seams, surfacing and application method.
Flashings and Equipment
Walls, curbs, pipes, supports, expansion joints, pitch pans and rooftop trades.
Perimeter and Drainage Metal
Edges, coping, fascia, gutters, scuppers, counterflashing and tested wind resistance.
Testing and Roof File
Inspections, seam checks, corrections, photos, as-builts, warranty, maintenance and repair stock.
Do Not Design the New Roof Until the Existing Assembly Is Understood
Moisture and Existing Layers Change the Strategy
Thermal scans, capacitance or nuclear surveys, impedance testing and core cuts provide different information and limitations. Findings should be reconciled with leak history, deck observations and field verification.
- Map wet or suspect insulation.
- Confirm known roof layers and deck type.
- Define tear-off, drying and unit-price assumptions.
- Separate restoration, recovery and replacement candidacy.
A New Membrane Does Not Correct a Poor Drainage Plane
Outlets, deck deflection, insulation, curbs, thresholds, overflow and downstream capacity must be evaluated together.
Primary Drains
Verify bowl, clamping ring, sump, strainers, pipe capacity, service access and interior consequences.
Scuppers and Overflows
Confirm elevations, openings, conductor heads, leaders, discharge and independent overflow paths.
Crickets and Saddles
Direct water around curbs, walls and equipment without creating thin insulation or trapped pockets.
Flashing Heights
Tapered insulation can reduce available curb, wall, door and equipment clearances; details may need reconstruction.
Field, Perimeter and Corner Zones May Require Different Assemblies
South Florida low-slope design must connect calculated pressures to a tested roof assembly and the actual deck or substrate.
Mechanically Attached
Membrane sheet width, fastener rows, plates, spacing, deck pullout and seam layout must match the approved assembly and zone.
Fully Adhered
Deck, insulation, cover board, adhesive ribbon or coverage, surface preparation and wind capacity control; “fully adhered” is not a universal performance rating.
Induction Weld / Hybrid
Insulation fasteners and coated plates may secure both insulation and membrane, subject to the exact system, deck, layout and approval.
Installation Method Must Fit the Building’s Operations
Residents and Tenants
Notices, parking, access, noise, dust, interior protection, daily cleanup and emergency contacts.
Odor and Flame Controls
Self-adhered, cold-applied, hot asphalt and torch methods have different occupant, fire-watch and operational implications.
Rooftop Equipment
Shutdowns, curbs, supports, condensate, grease, exhaust, electrical, plumbing, solar and future service access.
Critical Continuity
Data, healthcare, food, manufacturing, hospitality and sensitive interiors may require redundancy, temporary protection and restricted work windows.
Four Different Scopes—Four Different Qualification Standards
This authority owns complete replacement. It should still send a property out of replacement when investigation shows a responsible lower-intervention path.
| Strategy | Appropriate when | Disqualifiers / red flags | Authority |
|---|---|---|---|
| Localized Repair | Defects are isolated and the surrounding assembly remains serviceable. | Widespread moisture, repeated failure, systemic attachment or drainage issues. | Commercial Repair → |
| Restoration / Recoat | Existing roof is compatible, substantially dry, adequately attached and repairable. | Wet insulation, weak substrate, incompatible chemistry, unresolved drainage or structural failure. | Coatings & Restoration → |
| Roof Recover | Retained assembly qualifies for a new approved roof above it. | Unknown layers, trapped moisture, weak deck, load/height/detail conflicts or approval limitations. | Commercial Recover → |
| Complete Replacement | Failed or wet materials should be removed, deck/drainage corrected, and a new assembly built. | Replacement itself still requires operational, weather, deck and daily dry-in controls. |
Commercial Flat Roofing in Real South Florida Conditions
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Commercial roofing capability in motion.
The final production page should serve an optimized video file, poster image, captions or transcript when speech is present, and analytics for playback and consultation actions.
The Approved Assembly Controls—Not the Logo on the Proposal
Manufacturer families are useful comparison paths. Final selection requires the exact membrane or roof system, substrate, insulation, cover board, attachment, design pressure, details, fire classification, current approval/listing and written warranty requirements.
GAF
TPO, PVC and asphaltic commercial-system pathways. Verify current Florida approvals, exact assembly and warranty requirements.
Official commercial systems →Carlisle / Versico
TPO, PVC, EPDM, fleece-backed and specialty commercial roof systems with assembly-specific attachment and warranty paths.
Carlisle systems →SOPREMA
PVC, SBS-modified bitumen, liquid-applied materials, insulation and commercial roofing accessories.
Codes & approvals →Johns Manville
Single-ply, modified-bitumen, BUR, insulation and cover-board system pathways.
Commercial roofing →System-specific specialists
FiberTite/Seaman, Mule-Hide, Elevate and other manufacturers may be appropriate depending on exposure and assembly. Product and credential status must be verified project-by-project.
Aastro Credentials →Approval databases
Florida Product Approval, Miami-Dade Product Control where applicable, and FM RoofNav/approval listings may all affect the final assembly.
Florida Wind & Code →A Commercial Flat Roof Proposal Should Define at Least Fourteen Controls
Ten Controlled Steps From Investigation to Closeout
Define Property and Authority
Buildings, roof areas, occupancy, contacts, approvals and objectives.
Review Records
Plans, warranties, repairs, leaks, permits, reports and prior scopes.
Investigate Assembly
Core cuts, moisture, deck, drainage, equipment, walls and edges.
Compare Strategies
Repair, restoration, recovery, replacement, phasing and alternatives.
Develop Roof Design
System, insulation, drainage, wind, attachment, details and approvals.
Coordinate Operations
Access, notices, safety, protection, shutdowns, noise, odor and weather.
Normalize the Proposal
Scope, unit prices, exclusions, schedule, testing and warranty pathway.
Permit and Procure
Submittals, materials, manufacturer registration, staging and logistics.
Install and Document
Daily production, dry-in, quality checks, inspections, changes and photos.
Close Out and Maintain
Final inspection, warranty, as-builts, roof file, training and maintenance.
Route the Property to the Correct Investigation and Design Path
This planner does not diagnose the roof, establish price, reserve labor, determine insurance coverage or guarantee warranty eligibility.
Complete all seven questions.
Your result will explain why a pathway was selected, what Aastro should evaluate and the recommended next process.
Verify the Assembly at Design and Permit Time
These resources establish the verification path. They do not substitute for project-specific design, product limitations, manufacturer instructions or jurisdiction review.
Florida Building Commission
8th Edition (2023) remains the current statewide code basis; the 9th Edition (2026) transition is in Florida’s 2026 adoption process; verify the effective date before permitting.
Code resources →Florida Product Approval
Search the exact roof-system approval and confirm HVHZ/non-HVHZ limits, deck, attachment and maximum design-pressure tables.
Product Approval search →Miami-Dade Product Control
Where HVHZ or project requirements call for a Miami-Dade NOA, verify the current notice, expiration, deck and assembly limitations.
Product Control →FM Approvals / RoofNav
For FM-insured or FM-designed facilities, use the current approved assembly and property-specific wind criteria rather than generic fastening assumptions.
FM Approvals →Palm Beach and Broward Counties
Palm Beach County
Broward County
Direct Answers for Owners, Boards and Property Managers
What is a commercial flat roof replacement?
It is the permitted replacement of a commercial low-slope roof assembly, not merely the surface membrane. The scope may include investigation, tear-off or approved recovery preparation, deck repairs, vapor control, insulation, tapered drainage, cover board, attachment, membrane or asphaltic plies, flashings, perimeter metal, drains, testing, inspections, closeout and warranty registration.
How does Aastro choose between TPO, PVC, KEE, modified bitumen, BUR and EPDM?
The choice depends on the existing assembly, deck, wind pressures, moisture, drainage, traffic, grease or chemical exposure, fire classification, rooftop equipment, installation method, maintenance capability, budget, product approvals and warranty objectives. No membrane is universally best for every property.
Can a commercial flat roof be recovered instead of torn off?
Sometimes, but recovery is not automatic. Existing layers, trapped moisture, attachment, deck condition, fire classification, flashing heights, drainage, added dead load, product approval and manufacturer requirements must support the selected recovery assembly.
Why is a moisture survey important before replacement?
Wet insulation can reduce thermal performance, compromise attachment, conceal deck deterioration and disqualify portions of a roof from restoration or recovery. Survey findings should be reconciled with core cuts, leak history and field verification.
What is tapered insulation?
Tapered insulation is insulation manufactured in sloped pieces to help direct water toward drains, scuppers or gutters. It should be designed with crickets, saddles, sumps, curbs, overflow and flashing-height constraints rather than added as a generic line item.
Do white TPO or PVC roofs guarantee lower utility bills?
No. Reflective membranes can reduce solar heat gain at the roof surface, but building energy performance also depends on insulation, air leakage, HVAC, interior loads, roof area, climate, membrane condition and how the complete assembly is designed.
What is the difference between PVC and KEE roofing?
Both are heat-welded thermoplastic systems, but formulation, reinforcement, thickness, chemical resistance, flexibility and warranty requirements vary by product. KEE content and performance should be verified from the exact membrane data and approved assembly.
When is modified bitumen or built-up roofing a strong option?
Multi-ply asphaltic systems may be appropriate where redundant waterproofing layers, puncture resistance, familiar detailing, traffic or compatibility with existing asphaltic roofing are priorities. Application method, fumes, flames, occupant sensitivity and project specifications must be considered.
Is EPDM suitable for South Florida commercial roofs?
EPDM can be evaluated where the approved assembly, attachment, fire classification, detailing, color and owner objectives support it. It should not be treated as interchangeable with TPO, PVC or KEE, and current Florida approvals and manufacturer requirements must be verified.
How do roof pressure zones affect a commercial flat roof?
Field, perimeter and corner zones can have different wind-uplift demands. Sheet width, fastener rows, plate spacing, insulation attachment, adhesives, edge systems and tested assembly capacity may change by zone.
What should happen at drains, scuppers and overflow outlets?
The design should verify outlet location and size, sump geometry, membrane and metal integration, overflow provisions, downstream capacity, debris control and service access. A new membrane alone does not correct structural deflection or poor drainage.
How are rooftop HVAC units and penetrations handled?
The scope should identify curbs, supports, condensate, pitch pans, pipes, abandoned penetrations, equipment shutdowns, trade responsibility, temporary protection, flashing heights and future service access before production begins.
Can a coating replace a failed roof?
Not universally. Coatings may be considered when the existing roof is compatible, substantially dry, adequately attached, repairable and capable of being prepared to the manufacturer’s requirements. Wet insulation, structural problems, unresolved ponding and widespread failure may require replacement instead.
What warranty options are available?
Warranty type and duration depend on the exact manufacturer, system specification, contractor status, project registration, inspections, owner type, maintenance and written warranty. A warranty term is not a prediction of roof life.
What should a commercial flat roof proposal include?
It should define the existing assembly and investigation, removal or recovery limits, deck and wet-insulation procedure, insulation and drainage, cover board, attachment, exact membrane or plies, flashings, perimeter, drains, testing, phasing, protection, unit prices, exclusions, closeout and warranty pathway.
How should a condominium, multifamily or portfolio project be phased?
The owner should inventory every building and roof area, rank risk, coordinate occupants and access, define temporary tie-ins, protect delayed phases, standardize compatible details and maintain a separate closeout and warranty record for each building or phase.
When should SPF be considered for a commercial flat roof replacement?
SPF can be evaluated when the substrate, moisture condition, environmental application window, overspray controls, foam quality, drainage profile, protective coating, wind design and maintenance plan support a complete spray-polyurethane-foam roofing system. Foam should not be used to conceal wet or structurally deficient materials.
Tell Aastro What You Know About the Property
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.
Investigate the Assembly Before Choosing the Membrane
Aastro can help organize moisture, drainage, deck, system, wind, operations, phasing and warranty questions into a controlled commercial replacement plan.
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