// CODE SNIPPET
G304.3 Coastal A-Zone Construction Standards
JUMP TO FULL CODE CHAPTER
In addition to the requirements of ASCE 24, all post-FIRM new buildings and substantial improvements in a Coastal A-Zone shall comply with the V-Zone construction standards of Section G304.2.
Exceptions: The following structural systems shall be permitted in a Coastal A-Zone:
- Wave-resisting stem wall foundation. Stem walls supporting a floor system above, and backfilled with soil or gravel to the underside of the floor system, shall be permitted in Coastal A-Zones. The design and construction of the shallow foundation system shall comply with the following:
- The underside of such floor system shall be located at or above the design flood elevation specified in ASCE 24, Table 4-1.
- Stem walls enclosing areas below the design flood elevation shall not be permitted. Stem walls shall be designed to transfer all vertical and lateral forces to the slab above and to the foundation elements below;
- The design shall consider all forces resulting from flooding, including wave action, debris impact, erosion, and local scour;
- The design shall consider all forces resulting from soil pressure behind the walls, including the effect of hydrostatic loads, and all live and dead surcharge loads from the slab above;
- Flood openings shall not be required in stem walls constructed in accordance with this section;
- Where soils are susceptible to erosion and local scour, stem walls shall be supported by deep footings;
- Shallow foundations including spread footing, mat and raft foundations shall be designed to prevent sliding, uplift, or overturning when exposed to the combination of loads in ASCE Section 1.6.2.
- Wave-resisting dry floodproofing wall and foundation system. Buildings that are non-residential (for flood zone purposes) and that are located in Coastal A-Zones shall be permitted to be dry floodproofed in accordance with Section G304.1.2 provided the structure is dry floodproofed to at or above the design flood elevation specified in ASCE 24, Table 6-1. For buildings or structures utilizing this exception, construction documents shall include calculations demonstrating that the foundation and building, including flood shields if provided, will resist the wave action, including the combination of loads in ASCE Section 1.6, to at or above the design flood elevation specified in ASCE 24, Table 4-1.
Related Code Sections
G304.3 Flood-Resistant Construction, Coastal A-Zone Construction Standards
construction standards of Section G304.2.
Exceptions: The following structural systems shall be permitted in a Coastal A-Zone:
Wave ...
NYC Building Code 2014 > G Flood-Resistant Construction > G304 Post-Firm Construction and Substantial Improvements > G304.3 Coastal A-Zone Construction Standards
G104.5.2 Flood-Resistant Construction, V-Zones and Coastal A-Zones
For construction in V-Zones and coastal A-Zones the permit application shall include the following certifications, as applicable:
Structural ...
NYC Building Code 2014 > G Flood-Resistant Construction > G104 Permits > G104.5 Certifications > G104.5.2 V-Zones and Coastal A-Zones
G104.5.2 Flood-Resistant Construction, V-Zones and Coastal A-Zones
For construction in V-Zones and Coastal A-Zones the permit application shall include the following certifications, as applicable: Structural ...
NYC Building Code 2008 > G Flood-Resistant Construction > G104 Permits > G104.5 Certifications > G104.5.2 V-Zones and Coastal A-Zones
G304.1 Flood-Resistant Construction, A-Zone Construction Standards
A-Zones, other than Coastal A-Zones. For buildings ...
NYC Building Code 2008 > G Flood-Resistant Construction > G304 Post-Firm Construction and Substantial Improvements > G304.1 A-Zone Construction Standards
§28-104.9 Administration, Coastal Zones and Water-Sensitive Inland Zones
Construction documents shall comply with sections 28-104.9.1 through 28-104.9.6 relating to work in coastal zones and water-sensitive inland ...
NYC General Admin. Provisions 2014 > 1 Administration > 104 Construction Documents > §28-104.9 Coastal Zones and Water-Sensitive Inland Zones