Guide
Florida Building Code roof replacement rules: what a reroof triggers
Updated
Florida is unusual: replacing the covering pulls in mitigation work that the old roof never had. Knowing which items are required stops you comparing a compliant bid against a cheap one.
Two things every roof replacement must include
Florida law directs that for site-built single-family residential structures, "a roof replacement must incorporate the techniques specified in subparagraphs (2)(b)2. and 4." Those two subparagraphs are secondary water barriers for roofs and strengthening or correcting roof-decking attachments and fasteners during reroofing (F.S. 553.844(3)(a)).
- The secondary water barrier is the layer that keeps water out if the covering is stripped by wind. The statute says the criteria may not be limited to one method or material, so ask which method your roofer is using.
- Deck refastening happens once the old covering is off, and it is the reason a Florida tear-off costs more labor than a simple covering swap.
The roof-to-wall rule, and its 15 percent cap
For a building located in the wind-borne debris region with an insured value of $300,000 or more (or, if uninsured, a just valuation for ad valorem tax purposes of $300,000 or more), a roof replacement must also incorporate improved roof-to-wall connections. The Legislature was explicit about cost: connections "shall not be required unless evaluation and installation of connections at gable ends or all corners can be completed for 15 percent of the cost of roof replacement", and where a house has both hip and gable ends, gable ends are the priority (F.S. 553.844(2)(b)3. and (3)(b)).
The 25 percent rule, stated correctly
This one is widely mangled online, so here is the statutory text in plain order. If an existing roofing system or roof section was built, repaired or replaced in compliance with the 2007 Florida Building Code or any later edition, and 25 percent or more of it is being repaired, replaced or recovered, then only the repaired, replaced or recovered portion has to be constructed to the Florida Building Code in effect. The statute also bars a local government from adopting an administrative or technical amendment to this exception (F.S. 553.844(5)).
Read the condition first. The exception only helps if the existing roof already met the 2007 code or later. On an older roof, the exception does not apply, which is exactly why the age and code history of your current roof belongs in the conversation with every bidder.
South Florida: extra paperwork, by design
Counties in the High Velocity Hurricane Zone run their own roofing permit process. Miami-Dade County, for example, publishes a full set of HVHZ roof system forms and states that "the Uniform Permit Application form is required for all roofing permits", along with a Required Owner's Notification for Roofing Considerations that explains job site conditions commonly encountered during reroofing (Miami-Dade roofing permits). If you are in South Florida, ask your own building department whether HVHZ requirements apply at your address before you compare bids, because they change the forms, the details and the price.
How to use this when comparing bids
- Ask each bidder to itemize the secondary water barrier and name the method.
- Ask whether deck refastening is priced in, and what the rate is if sheathing needs replacing.
- Ask whether your address is in the wind-borne debris region and whether the roof-to-wall rule is engaged.
- Tell them what you know about when the current roof was installed, so the 25 percent question is answered on facts.
- Confirm who pulls the permit and which county forms apply.