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This is one of the most important questions you can ask — and many homeowners never think to ask it.
What layering means
Some contractors will install new shingles directly over your existing roof without removing the old ones. This is called a "re-roof" or "overlay." It's faster and cheaper for the contractor.
Why it's usually a bad idea
- It adds weight — most roofs are designed for one layer of shingles, not two
- It traps moisture — existing rot or water damage is hidden and continues to spread
- It shortens shingle life — heat buildup between layers degrades the new shingles faster
- It hides damage — storm damage to decking is only visible during tear-off
Florida building code
Most Florida jurisdictions now prohibit more than one layer of shingles. If you're in a coastal county, your permit will likely require a full tear-off regardless.
Insurance implications
In a storm damage claim, your insurer expects a full tear-off. An overlay may complicate your claim or reduce your payout.
🚩 Red flag
Any contractor who offers to "save you money" by layering without specifically discussing your decking condition and local code requirements.
