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3109.4.2 Walls Below the 100-Year Storm Elevation
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No substantial walls or partitions shall be constructed below the level of the first finished floor of habitable structures. All other walls shall be designed to break away.
Exceptions:
- Stairways and stairwells;
- Shear walls perpendicular to the shoreline;
- Shear walls parallel to the shoreline, which are limited to a maximum of 20 percent of the building length in the direction running parallel to the shore;
- Shear walls parallel to the shoreline, which exceed 20 percent of the total building length (including any attached major structure) when they meet the following criteria:
- A certification is provided by a Florida-registered professional engineer that certifies that the increased length of shear walls, over 20 percent, are located landward of the 100-year erosion limit;
- A hydraulic analysis is provided and certified by a Florida-registered professional engineer that evaluates the potential impact of flow increase on the subject parcel and adjacent properties;
- The hydraulic analysis demonstrates that although the overall shearwall coverage is more than 20 percent, the increased shearwall length will not result in substantial increase of flow velocities and drag forces on the structural components of the proposed structure and neighboring structures; and
- The provisions under Section 3109.4.2 (Exception 4) do not include any low-rise building as defined in Section 1609.2.
- Wind or sand screens constructed of fiber or wire mesh;
- Light, open lattice partitions with individual, wooden lattice strips not greater than 3/4-inch (19 mm) thick and 3-inches (76 mm) wide;
- Elevator shafts;
- Small mechanical and electrical rooms; and
- Break-away or frangible walls.
Related Code Sections
3109.4.2 Special Construction, Walls Below the 100-Year Storm Elevation
No substantial walls or partitions shall be constructed below the level of the first finished floor of habitable structures. All other walls shall ...
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2014 FBC - Building, 5th edition > 31 Special Construction > 3109 Structures Seaward of a Coastal Construction Control Line > 3109.5 Flood Loads During a 100-Year Storm