Hurricane Protection for Doors: Impact vs. Panels

Florida's OIR-B1-1802 wind mitigation form (Rev. 04/26) rates opening protection by the single weakest form of windborne-debris protection on the entire structure. It counts windows, exterior portals, sliding glass panels, skylights, and garage units alike. One unprotected or under-documented opening can drag the whole property to Level N. Level N is the lowest rating tier. It eliminates any rate differential. ASTM E1886 explains the engineering reason. When a windward wall is breached, the internal pressure coefficient can rise by a factor as high as 4. That increase raises outward-acting pressure on the remaining walls and the roof by as much as 2 times. That cascading failure is why Florida's High-Velocity Hurricane Zone (HVHZ), covering Miami-Dade and Broward, treats every part of the building envelope as a single system. Proper hurricane protection for doors is not optional. It is the load-path anchor that keeps every other structural assembly in place when pressure spikes.

Two sections of the Florida Building Code govern hurricane protection for doors. In the HVHZ, Section 1626.1 requires all parts of the building envelope, exterior walls, outside entrances, glazing, and skylights, to meet impact test criteria or be shielded by an external protection device that itself meets those criteria. Section 1626.2.6.1 adds that shutters and similar devices must resist large-missile impacts without deforming far enough to contact the assembly they protect. Outside the HVHZ, Section 1609.1.2 requires glazed openings to be impact-resistant or covered with protection meeting TAS 201/202/203, AAMA 506, ASTM E1996, and ASTM E1886; openings within 30 feet of grade must pass the large-missile test. Residential Section R301.2.1.2 carves out a plywood exception: precut wood structural panels at least 7/16-inch thick, with no more than 44 inches between fastener lines, on buildings with a mean roof height of 33 feet or less where design wind speed (Vult) is 180 mph or less. They must extend at least 2 inches beyond fastener lines, be predrilled, and use corrosion-resistant hardware permanently attached to the building. For HVHZ properties, always confirm compliance with your local building department.

HomeAdvisor's national shutter cost guide (updated June 19, 2026) lists per-square-foot installed prices across every major covering type. Accordion shutters run $15–$30 per square foot. Roll-down systems cost $25–$60. Bahama and colonial styles land at $20–$35 and $25–$35 respectively. Storm panels, corrugated steel, aluminum, or polycarbonate, are the most affordable at $10–$20. Fabric screens average $5–$15, and precut plywood comes in as low as $2–$6 but carries the highest labor burden because it must be put up and taken down before and after every storm. Permits for shutter work typically run $50 to $200. On the impact-rated side, HomeAdvisor's sliding glass unit cost guide (updated June 17, 2026) lists hurricane-grade sliding units at $2,000–$3,000 nationally. For a detailed breakdown of what a full impact door installation in South Florida involves, including permit fees and labor, see the linked service page.

FEMA Fact Sheet 6.2 (Protection of Openings, Shutters and Glazing) makes 3 points that every South Florida homeowner should read before choosing a covering strategy. First, when glazing or an entry panel is protected by shutters, screens, or storm panels, the covered assembly must still be designed to resist the full design wind loads, do not assume the covering reduces pressure on what is behind it. Second, shutters should not be assumed to significantly decrease wind-driven rain on the covered assembly. Third, a shutter may look capable of stopping windborne missiles but, unless it has been tested and bears a label showing code compliance, its missile resistance is unknown. FEMA Recovery Advisory 4 (March 2018) echoes this, noting the most common failure point is surface water and rain entering at the gap between the panel and the threshold, jamb, or head. The DOE Building America Solution Center adds that the IBHS FORTIFIED Home program requires at least 1 entry opening to be operable from inside when protection is up, a practical detail that matters if a storm passes and you cannot raise the shutters from inside. Reviewing your hurricane prep checklist for impact windows alongside these facts can help you spot gaps in your current plan.

Sliding glass panels cover large surface areas. They sit on rear-facing walls that catch the full force of a landfalling storm. Fixr's hurricane shutter cost guide (updated January 31, 2025) puts shutter materials and installation for a sliding panel at $12–$60 per square foot nationally. Accordion and roll-up styles are the most common types used on these openings. HomeAdvisor's sliding glass unit guide lists hurricane-impact sliding panels at $2,000–$3,000. That makes a full replacement competitive when you factor in the recurring labor of deploying and storing coverings before each storm. A sliding glass door installation by a licensed contractor comes with a Miami-Dade NOA (Notice of Acceptance) or Florida Product Approval number. That approval satisfies the Level A standard on OIR-B1-1802 without any additional documentation. That single paperwork advantage often tips the math in favor of replacement. This is especially true for homeowners whose current frame shows air or water infiltration at the threshold. FEMA RA4 flags that exact failure mode as the most common hurricane entry point.

Florida's uniform wind mitigation inspection form OIR-B1-1802 (Rev. 04/26) classifies opening protection into tiers. Level A is the strongest: verified cyclic-pressure and 9-lb large-missile protection tested to Miami-Dade PA 201/202/203, FBC TAS 201/202/203, ASTM E1886 and E1996, or SSTD 12. Level C covers verified plywood or OSB meeting Table 1609.1.2 of the FBC 2007. Level N captures coverings that appear compliant but lack documentation, no product approval on file, no label, no test report. Structures with openings that need replacement do not qualify for wind mitigation rate differentials at all. The form rates the entire property by its single weakest opening, so 1 unprotected or undocumented entry can pull every other rated opening down to Level N. For a detailed walk-through of how the form works and how it interacts with Citizens and other Florida insurers, see the opening protection and X-rating insurance guide. You can also verify that any contractor you consider holds an active license through the Florida DBPR contractor lookup before signing a contract.

Standard entry panels and French-style units are often the last openings homeowners upgrade. They are also the first ones an inspector flags on a wind mitigation form. An impact-rated entry panel combines a laminated glass lite (light) or solid impact-rated panel with an engineered frame. It also includes multi-point locking hardware. All components are tested as a single assembly to ASTM E1886 and E1996 large-missile criteria. The entire assembly carries a Florida Product Approval or Miami-Dade NOA. That means there is no ambiguity on the inspection form. For homeowners considering a French door installation, the same logic applies. A tested, labeled assembly eliminates the documentation gap that keeps many properties at Level N. SafeGuard's under-3% warranty callback rate is a meaningful benchmark here. Proper installation technique and frame prep separate a watertight, code-compliant unit from one that leaks at the threshold after the first tropical rain. Proper hurricane protection for doors at the entry is not just about surviving a major storm. It is about keeping the interior dry through the dozens of rain events that precede landfall every season.