Building a house in a wind-borne debris region on the Florida coast.

Florida Building Code (FBC) Chapter 7, Section R301.2.1 governs wind-borne debris protection. Here's what applies:

Legal Requirements:

• Plywood shutters ARE legal if they meet specific criteria
• Must be minimum 5/8" thick CDX plywood or equivalent
• Must be properly anchored with #10 screws or bolts every 6" along edges, 12" in field
• Must extend at least 12" beyond window/door openings
• Must be installed before wind speeds reach 110 mph (typically during hurricane watches)

Key Limitations:

• Not permitted as permanent installed protection - must be removable
• Cannot be used in lieu of impact-resistant glazing for new construction in High Velocity Hurricane Zone (HVHZ) - Miami-Dade/Broward counties
• Must comply with ASTM E1886/E1996 for large missile impact testing

Bottom Line: Plywood shutters are legal for existing openings and temporary protection in most Florida coastal areas. However, for new construction in HVHZ, the code requires either:

1. Impact-resistant windows/doors, OR
2. Pre-installed anchor systems for shutters

Recommendation: Check with your local building department - some jurisdictions have additional requirements. The owner may save money upfront but will face higher insurance costs and potential difficulties selling the property.

Safety Note: Plywood must be properly installed - inadequate fastening is the #1 cause of failure during storms.

No, site-built plywood shutters are not a code-compliant permanent protection method for new construction in a Wind-Borne Debris Region (WBDR).

Code Basis (FBC 2023 / IBC 2021):

1. FBC Building §1609.1.2 / IBC §1609.1.2: Requires glazing in WBDRs to be protected by an approved impact-protective system.
2. FBC Building §1609.1.2.2 / IBC §1609.1.2.2: "Approved" systems must be tested and labeled per ASTM E1886 and ASTM E1996 (Large Missile Impact, typically Missile Level D for < 30 ft).
3. FBC Building §1609.1.4 / IBC §1609.1.4: Explicitly states: "Wood structural panels... are permitted for one- and two-story buildings only... provided they are precut and attached to the framing..." Critical Limitation: This exception applies to existing buildings (retrofit/emergency protection) per the commentary and FBC Existing Building provisions. It does not satisfy the "labeled system" requirement for new construction* glazing protection.

Practical Reality:

• No Label: You cannot get a Miami-Dade NOA or Florida Product Approval for field-cut plywood.
• Inspection Fail: The building official will reject final CO without labeled product stickers on every opening.
• Insurance: Citizens/private carriers require FBC-compliant opening protection for wind mitigation credits; plywood yields zero credit.

Options for Owner:

1. Impact-Rated Windows/Doors (ASTM E1996 Large Missile).
2. Approved Shutter Systems (Roll-down, accordion, panel—must have FL Product Approval/NOA).
3. Impact-Rated Screen/Fabric Systems (Must have approval).

Bottom Line: If the budget excludes impact glazing, specify a Florida Product Approved panel shutter system (aluminum/steel/polycarbonate panels with pre-installed anchors). It is the lowest-cost legal permanent alternative. Do not install plywood as permanent protection on a new build—it creates liability for you and the owner.