Subject: Windstorm Requirements Submitted by: Bill Erickson To be considered Fortified against windstorms in Florida, homes must include features that address protection of the building envelope from windborne debris, wind resistant roof coverings and underlayments as well as proof of a continuous load path from the roof to the foundation of the building. Building Envelope Protection: All entry doors, windows, skylights, patio doors and garage doors must be tested and certified to meet impact resistance and pressure standards. If the units themselves are not tested, then they must be protected by a protection system (storm shutter) that meets the impact resistance standards. Systems must be compliant with ASTM E 1996, SSTD-12 or Miami-Dade County protocol A 201. Roof Construction: The roof framing, sheathing and covering all must be constructed to resist wind pressures. In order to accomplish this, the following criteria need to be satisfied: o o o o o Gable end roof framing must be braced back to the interior portions of the roof and ceiling structure (both top and bottom of trusses) Roof decks must be at least 19/32” thick plywood and fastened to roof frame with minimum 8d ring shank nails @ 6” on center throughout each panel and 4” on center directly into the last truss or rafter on all gable ends. All roof deck joints must be sealed by a self-adhering polymer modified bitumen-roofing tape to provide a secondary moisture barrier (these materials are also referred to as “flexible flashing”). Products must be installed per the manufacturer’s recommendations (some require rolling after application). Minimum 30# roofing felt (or equivalent) must be used as underlayment for the roof covering. Roof covering must be certified for use in hurricane regions (i.e. Miami-Dade approved or ASTM D 3161 revised to 110 mph) and installed per manufacturer’s recommendations. Only a single layer of covering is permitted. Adequate Load Path: The load path from the roof to the foundation of the home must be readily verifiable. This includes: o o o o o Hurricane straps or other hardware that connect the roof to the walls installed in per manufacturer’s recommendations. Concrete block walls vertically reinforced every 4 feet and at all corners and ends of openings (minimum #4 re-bar) Inter-story details strapped to provide a load path from the upper story to the lower story. Wall-to-foundation connection a minimum of once every four feet and at all corners and wall openings. Securely anchored connections for exterior structures such as carports and porches that attach to the main structure of your home.