Modified Bitumen Roof Installations Over Existing Roofs in Florida | Roof Nuts FL
Can You Roof Over an Old Flat Roof? With Modified Bitumen, Yes—Sometimes
When it’s time to replace a flat roof, tearing off the old system isn’t always your only option. In many Florida cases, modified bitumen roofing can be installed over an existing roof—if the right conditions are met.
At Roof Nuts FL, we help property owners across Jacksonville, Orlando, Tampa, and beyond save time and money by properly installing modified bitumen (MB) recover systems over approved substrates. It’s faster, more affordable, and still code-compliant—when done correctly.
What Does “Roofing Over” Mean?
Roofing over—also called a recover—is the process of installing a new roof system directly over the old one, without tearing everything down to the deck.
For modified bitumen roofs, this typically involves:
Inspecting the existing roof
Installing a recovery board or insulation layer
Applying new base and cap sheets
Sealing seams, edges, and penetrations
When Is a Recover with MB Allowed?
Florida Building Code allows recover installations if the existing roof system meets certain criteria:
The structure supports the added weight
There is no moisture trapped in the existing system
No more than one roof layer is already in place
The surface is clean, dry, and stable
Local wind uplift requirements can still be met
At Roof Nuts FL, we perform a thorough inspection before recommending a recover. If the roof is saturated, damaged, or non-compliant, we’ll advise a full tear-off instead.
Benefits of Modified Bitumen Overlays
✔️ Faster Installation
No tear-off = less labor, fewer delays, and minimal disruption.
✔️ Cost Savings
Lower material disposal and labor costs mean better value.
✔️ Improved Insulation
We can add new cover board or insulation layers during the process.
✔️ Durability
Modern MB cap sheets provide waterproofing, UV protection, and long-term reliability.
✔️ Code Compliance
When properly engineered, recover systems meet wind uplift and fire resistance codes.
Our MB Recover Installation Process
1. Roof Evaluation
We use visual inspection and moisture detection to confirm the substrate is dry and suitable for overlay.
2. Surface Prep
We clean the roof, remove loose material, and install a recover board or new insulation as needed.
3. Base Sheet Installation
A reinforced base sheet is mechanically fastened or adhered over the new surface.
4. Cap Sheet Application
A granule or smooth-surfaced cap sheet is installed using torch, cold adhesive, or self-adhered methods.
5. Edge & Flashing Detailing
All roof edges, penetrations, and wall transitions are sealed to ensure complete waterproofing.
FAQs: Modified Bitumen Over Existing Roofs
Can I roof over a leaking flat roof?
Not if the leaks have saturated insulation or decking. Wet or damaged materials must be removed before overlay.
Will this save money compared to a tear-off?
Yes. You can often save 20–30% on labor and debris costs—if your existing roof qualifies.
How many layers of roofing are allowed?
Florida code permits no more than two total roofing layers. A third layer always requires full removal.
Is it as durable as a full replacement?
Yes—when installed over a solid substrate, a modified bitumen recover can last 20+ years with proper maintenance.
Overlay the Smart Way—With Experience and Code Knowledge
Not every flat roof qualifies for an overlay. But when it does, Roof Nuts FL makes sure it’s done right, from inspection to final seal. We follow Florida Building Code to ensure your modified bitumen recover system is safe, strong, and long-lasting.
📞 Call 904-694-3426 to schedule a roof evaluation or quote. We serve Jacksonville, Miami, Tampa, Orlando, Fort Lauderdale, and surrounding areas.
Your old roof may not need to go—let’s see if we can build right on top of it.
