Roof Replacement
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Short answer
Roof replacement means removing the existing covering down to the deck, repairing or replacing damaged sheathing, installing new underlayment and the new roof system. In Florida it is permitted, inspected work, and current code requirements for secondary water barriers, fastening and product approval apply to the new roof even if the old one predates them. Age, repeated leaks across multiple areas, and widespread storm damage are the usual reasons replacement beats another repair.
Roof replacement removes the existing roofing system down to the decking (or in some cases layers over it, where code allows) and installs new underlayment, flashing, and roofing material. It's typically considered when a roof is near the end of its service life, has widespread damage, or has recurring leaks despite repairs.
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What's involved in a full replacement
- Tear-off of existing roofing material down to the decking
- Decking inspection and replacement of any deteriorated sections
- Installation of new underlayment (and secondary water barrier where required)
- New flashing at all valleys, walls, chimneys, and penetrations
- Installation of new roofing material (shingle, tile, metal, or membrane)
- Final inspection, often tied to permit close-out
Signs it's time to consider replacement
- The roof is at or near the end of its expected service life for its material
- Damage or wear is spread across multiple areas rather than isolated
- Repeated repairs haven't resolved recurring leaks
- Decking has deteriorated in multiple locations
- Storm damage is extensive enough to trigger broader code requirements
Material options
| Material | General characteristics |
|---|---|
| Asphalt shingle | Common on steep-slope residential roofs; wide range of wind ratings depending on product and installation |
| Tile (clay or concrete) | Durable and common in Florida; heavier, requiring adequate structural support and correct fastening for wind resistance |
| Metal panel | Long service life and generally strong wind performance; higher upfront material cost |
| Low-slope membrane (TPO, modified bitumen) | Used on flat or low-slope roofs; performance depends heavily on proper drainage and seam installation |
The Florida 25% rule and permitting
The Florida Building Code contains provisions, sometimes referred to informally as a '25% rule,' that can require replacing more of the roof than the immediately damaged portion once work exceeds a certain extent. Whether this applies, and how, depends on the specific code edition in effect and how the local building department interprets it — confirm current requirements with your local building department before finalizing scope.
Full replacement almost always requires a permit and a final inspection; ask your contractor how permitting and inspection scheduling are handled.
Wind rating and hurricane considerations
New roofing systems installed in Florida are installed to current code wind-resistance requirements, which are generally more stringent than older code editions. Replacing an aging roof with a system installed to current standards, including a secondary water barrier where required, is one way homeowners address long-term hurricane resilience.
Roof repair vs roof replacement: how do I decide?
Repair is appropriate when damage is localized and the rest of the roof still has meaningful service life — a few displaced shingles, isolated flashing failure, or a single penetration leaking. Replacement is indicated when damage is widespread, when the roof covering is at the end of its rated life, when the deck below is compromised, or when repeated repairs have not stopped leaks in different locations.
| Finding | Usual direction |
|---|---|
| Localized damage on a roof with remaining life | Repair |
| Leaks appearing in several separate areas | Replacement evaluation |
| Widespread granule loss, curling or brittle covering | Replacement |
| Soft or rotted decking found during inspection | Replacement of affected structure |
Repair when
- Damage is confined to a small area
- The covering is in generally good condition
- The leak traces to one detail such as flashing or a boot
Replace when
- The roof is at the end of its service life
- Damage spans multiple slopes
- Repairs keep failing
Frequently asked questions
How long does a roof replacement take?
Timing depends on roof size, material, weather, and whether decking repairs are needed; a professional can give a project-specific timeline once the scope is set.
Do I need a permit for a full roof replacement?
Yes, roof replacement is typically permitted work with a required final inspection. Ask your contractor who pulls the permit and how inspections are scheduled.
Can I install a new layer of shingles over the old ones?
Layering over existing roofing is limited by code and by the number of existing layers already present, and generally isn't advisable when decking condition is unknown. A tear-off allows full inspection of the decking underneath.
Will replacing my roof affect my homeowners insurance?
A newer roof installed to current wind-resistance standards can affect insurance terms, but specifics vary by insurer. Check with your insurance provider directly rather than relying on general assumptions.
Sources
- Florida Building Code — permitting and inspection requirements — Florida Building Commission
- Verify a Florida contractor or plumbing license — Florida DBPR Licensing Portal
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