Modified Bitumen Roof Overlay in South Florida — Seamless, Waterproof, Durable
A modified bitumen overlay delivers fully adhered waterproofing over your existing commercial roof without the cost of full tear-off. Roofing Network installs SBS and APP modified bitumen overlay systems for commercial buildings across South Florida — assessed, permitted, warranted. Free inspection.
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Install Time
2–4 Days
Warranty
NDL 10–15yr
Includes
Commercial Overlay Systems
New Waterproofing Performance, No Tear-Off Required
Modified bitumen overlay systems are a proven, cost-effective alternative to full tear-off for commercial buildings with sound existing substrates in South Florida. By torch-applying or cold-adhering a new modified bitumen cap sheet system directly over the existing surface, we restore full waterproofing performance, add UV resistance, and extend roof life by 10–15 years — at 30–40% less cost than full replacement. Roofing Network confirms overlay eligibility through core sampling before recommending this approach.
Modified bitumen overlay is distinct from TPO or EPDM overlay in one important respect: the torch-applied or hot-mopped installation creates a monolithic, fully bonded membrane — eliminating the seam separation risk of single-ply overlays in South Florida's wind and thermal cycling environment. For buildings where wind uplift resistance is a priority (coastal exposure, elevated buildings, HVHZ zone requirements), a fully adhered modified bitumen overlay often outperforms mechanically attached single-ply alternatives.
Key Benefits
• Fully Bonded Membrane: Torch-applied modified bitumen bonds directly to the existing surface — no mechanically attached laps or adhesive seams subject to wind uplift. The finished surface is monolithic.
• Core-Sample Eligibility Check: We core sample the existing roof before recommending overlay — confirming dryness and structural soundness. Modified bitumen overlay over wet insulation traps moisture and accelerates deck damage.
• HVHZ Wind Uplift Compliance: All modified bitumen overlay systems are specified to meet Miami-Dade Notice of Acceptance (NOA) wind uplift requirements — mandatory across all three South Florida counties.
System | Description | Best For | Lifespan Added |
|---|---|---|---|
APP Mineral-Surface Cap | Torch-applied APP, granulated mineral finish | High UV/coastal exposure, maximum surface hardness | 12–18 years |
SBS 2-Ply (Base + Cap) | Torch-applied SBS base + mineral cap | Maximum adhesion, buildings with structural movement | 15–20 years |
Cold-Applied SBS Cap | Cold adhesive application, no torch | Occupied buildings, fire-code restrictions | 10–15 years |
APP Smooth Cap (for Coating) | Torch-applied smooth-surface APP for subsequent coating | Buildings where reflective coating will be added | 15–20 years with coating |
Why Choose Us
4 Reasons Roofing Network is South Florida's Top Choice
Torch-Applied Fully Bonded System
01
Modified bitumen overlay is torch-applied directly to the existing substrate — creating a continuous, fully bonded waterproof membrane with no fastener penetrations and no adhesive seam gaps. This makes it one of the most wind-uplift-resistant overlay options available in South Florida's HVHZ zones.
Core-Sample Eligibility Check
02
We core sample the existing roof at a minimum of three locations before confirming overlay eligibility. Wet insulation, delaminated existing membranes, or inadequate slope disqualify a roof for overlay — and we tell you directly if that's what we find, rather than overlaying a compromised substrate.
APP vs. SBS Selection
03
We specify SBS vs. APP modified bitumen based on your building's specific conditions. APP provides superior UV resistance and surface hardness — preferred for highly exposed South Florida coastal applications. SBS provides superior elongation and cold-crack resistance — preferred for buildings with significant structural movement or where cold-applied installation is required.
Warranty & NDL Options
01
Modified bitumen overlay systems qualify for manufacturer material warranties and NDL (No-Dollar-Limit) warranty programs from major manufacturers — covering both materials and labor for 10–15 years on properly installed overlay systems. We manage the full NDL qualification process.
Modified Bitumen Overlay System Options
Modified bitumen overlays are available in several configurations. Below are the most commonly specified systems for South Florida commercial buildings.
System | Description | Best For | Lifespan Added |
|---|---|---|---|
APP Mineral-Surface Cap | Torch-applied APP, granulated mineral finish | High UV/coastal exposure, maximum surface hardness | 12–18 years |
SBS 2-Ply (Base + Cap) | Torch-applied SBS base + mineral cap | Maximum adhesion, buildings with structural movement | 15–20 years |
Cold-Applied SBS Cap | Cold adhesive application, no torch | Occupied buildings, fire-code restrictions | 10–15 years |
APP Smooth Cap (for Coating) | Torch-applied smooth-surface APP for subsequent coating | Buildings where reflective coating will be added | 15–20 years with coating |
$4–$8/sq ft installed — 10,000 sq ft approx. $40,000–$80,000
Modified bitumen overlay pricing confirmed after core sampling and site assessment. Free aerial measurement and eligibility assessment — call 954-588-8734. Weekend assessment available for occupied facilities.
License Number
CCC1329271 / CGC1517295
30+ Years in Business
South Florida Experts
Our Process
How Your Modified Bitumen Roof Overlay Works
No surprises. No handoffs to a subcontractor. The same team from quote to completion.
01
Core Sampling & Assessment
Core sampling at minimum 3 locations to confirm substrate dryness and structural soundness. Infrared moisture scan available for large facilities. Drainage and slope review. Written eligibility determination.
System Specification
Written specification: SBS or APP selection, ply count (1-ply cap or 2-ply base + cap), surface finish (granulated mineral, smooth for coating), warranty option, and disruption minimization plan.
02
03
Permit & Procurement
Commercial permit submitted with NOA documentation. Materials ordered — modified bitumen material lead times 5–10 business days typically.
Surface Prep & Overlay Installation
County inspection and Certificate of Completion. Manufacturer NDL inspection if applicable. All warranty documentation and maintenance notes delivered.
04
05
County inspection and Certificate of Completion. Manufacturer NDL inspection if applicable. All warranty documentation and maintenance notes delivered.
FAQ
Modified Bitumen Roof Overlay— Common Questions
Everything you need to know about roofing in South Florida. Can't find your answer? Call us directly.
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