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G304.2 V-Zone Construction Standards
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In addition to the requirements of ASCE 24, the following standards shall apply to post-FIRM construction and substantial improvements located within V-Zones.
- Foundation. The lowest floor shall be elevated on adequately anchored pilings or columns and securely anchored to such piles or columns to prevent floatation, collapse and lateral movement resulting from wind and flood loads acting simultaneously on all building components, and other load requirements of Chapter 16 and this appendix.
- Lowest horizontal member. The lowest portion of the lowest horizontal structural member of the lowest floor (excluding the pilings or columns) shall be at or above the design flood elevation specified in ASCE 24, Table 4-1.
- Below the lowest horizontal member. Spaces below the lowest horizontal member shall be either:
- Free of obstructions; or
- Enclosed with breakaway walls providing unconditioned space useable solely for parking of vehicles, building access, storage or crawl space. Such breakaway walls shall:
- Be of an open lattice type construction only;
- Meet the load requirements of Section 5.3.3 of ASCE 7; and
- Meet the additional requirements of ASCE 24.
- Materials. Only flood-damage-resistant materials and finishes shall be utilized below the design flood elevation specified in ASCE 24, Table 5-1;
- Utilities and equipment. Utilities and attendant equipment shall be located at or above the design flood elevation specified in ASCE 24, Table 7-1, or shall be constructed so as to both resist the wave action and prevent water from entering or accumulating within the components during conditions of flooding in accordance with ASCE 24;
- Additional requirements. The structure shall comply with Items 5.1 through 5.4 of Section G304.1.1.
- Prohibitions. The following shall be prohibited in V-Zones:
- Development, including land-disturbing activities, seaward of the reach of mean high tide;
- Use of fill for structural support of buildings; and
- Man-made alterations of sand dunes that would increase potential damage to buildings.
- Certifications. Applications shall contain applicable certifications in accordance with Section G104.5; and
- Special inspections. Special inspections shall be as required by Section G105.
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