In addition to the general requirements of Article IV, the requirements of this section shall:
A.
Apply in flood hazard areas that are identified
as coastal high hazard areas (V Zones).
B.
Apply to all development, new construction, substantial improvements including repair of substantial damage, and placement,
replacement, and substantial improvement (including
repair of substantial damage of manufactured
homes.
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[NOTE: See Coastal Construction Manual (FEMA 55).]
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A.
The applicant must demonstrate that no reasonable alternative exists
outside of the coastal high hazard area.
B.
The placement of structural fill for the purpose of elevating buildings
is prohibited.
C.
Buildings shall be located landward of the reach of mean high tide.
D.
Minor grading, and the placement of minor quantities of fill, shall
be permitted for landscaping and for drainage purposes under and around
buildings and for support of parking slabs, pool decks, patios and
walkways.
E.
Site preparations shall not alter sand dunes unless an engineering
analysis demonstrates that the potential for flood damage is not increased.
New structures and substantial improvement (including repair of substantial damage) of existing structures shall comply with the applicable requirements of Article IV and the requirements of this section.
A.
Foundations.
(1)
Structures shall be supported on pilings or
columns and shall be adequately anchored to such pilings or columns.
Pilings shall have adequate soil penetrations to resist the combined
wave and wind loads (lateral and uplift). Water loading values used
shall be those associated with the base flood. Wind
loading values shall be those required by applicable building
codes. Pile embedment shall include consideration of decreased
resistance capacity caused by scour of soil strata surrounding the
piling.
(2)
Slabs, pools, pool decks and walkways shall be located and constructed
to be structurally independent of structures and
their foundations to prevent transfer of flood loads
to the structures during conditions of flooding, scour, or erosion from wave-velocity flow conditions, and shall
be designed to minimize debris impacts to adjacent properties and
public infrastructure.
B.
C.
Certification of design. As required in § 14:3-19A(13), the applicant shall include in the application a certification prepared by a licensed professional engineer or a licensed architect that the design and methods of construction to be used meet the requirements of Subsections A, B, D, and the building code.
D.
Enclosures below the lowest floor.
(1)
Enclosures below the lowest floor shall be
used solely for parking of vehicles, building access or limited storage.
(2)
Enclosures below the lowest floor shall be
less than 299 square feet in area (exterior measurement).
(3)
Walls and partitions are permitted below the elevated floor,
provided that such walls and partitions are designed to break away
under flood loads and are not part of the structural
support of the building or structure. (NOTE: See
NFIP Technical Bulletin No. 9, "Design and Construction Guidance for
Breakaway Walls.")
(4)
Electrical, mechanical, and plumbing system components shall
not be mounted on or penetrate through walls that are designed to
break away under flood loads.
(5)
Walls intended to break away under flood loads
shall be constructed with insect screening or open lattice, or shall
be designed to break away or collapse without causing collapse, displacement
or other structural damage to the elevated portion of the building
or supporting foundation system. Such walls, framing and connections
shall have a design safe loading resistance of not less than 10 pounds
per square foot and no more than 20 pounds per square foot; or
(6)
Where wind loading values of the building code exceed 20 pounds per square foot, the applicant shall submit a certification
prepared and sealed by a licensed professional engineer
or licensed architect that:
(a)
The walls and partitions below the lowest floor have been designed to collapse from a water load less than that
which would occur during the base flood.
(b)
The elevated portion of the building and supporting foundation
system have been designed to withstand the effects of wind and flood loads acting simultaneously on all building components
(structural and nonstructural). Water loading values used shall be
those associated with the base flood; wind loading
values used shall be those required by the building code.
B.
For horizontal additions, whether structurally connected or not structurally
connected, to the base building:
(1)
If the addition combined with other proposed repairs, alterations,
or modifications of the base building constitutes substantial improvement, the base building and the addition shall comply with the applicable requirements of Article IV and this section.
(2)
If the addition constitutes substantial improvement, the base building, and the addition shall comply with all of the applicable requirements of Article IV and this section. [NOTE: The base building is required to comply otherwise
it is an obstruction that does not comply with the free-of-obstruction requirement that applies to the elevated addition; see § 14:3-56B(3).]
A.
Accessory structures shall be less than 299 square
feet in area (exterior measurement).
B.
Accessory structures shall comply with the elevation requirements and other requirements of § 14:3-56 or, if not elevated, shall:
(1)
Be usable only for parking of vehicles or limited storage;
(2)
Be constructed with flood damage-resistant materials below the base flood elevation;
(3)
Be constructed and placed to offer the minimum resistance to
the flow of floodwaters;
(4)
Be anchored to prevent flotation;
(5)
Have electrical service and mechanical equipment elevated to
or above the base flood elevation; and
(6)
Have walls that meet the requirements of § 14:3-56D(3) through (6), as applicable for the flood zone.
(NOTE: See NFIP Technical Bulletin No. 5, "Free-of-Obstruction
Requirements.")
A.
Decks and patios. In addition to the requirements of the building code or the residential code, decks and patios
shall be located, designed, and constructed in compliance with the
following:
(1)
A deck that is structurally attached to a building or structure shall have the bottom of the lowest horizontal structural member
at or above the flood protection elevation and any
supporting members that extend below the design flood elevation shall comply with the foundation requirements that apply
to the building or structure, which shall be designed
to accommodate any increased loads resulting from the attached deck.
(2)
A deck or patio that is located below the flood protection
elevation shall be structurally independent from structures and their foundation systems, and shall be designed
and constructed either to remain intact and in place during base flood conditions or to break apart into small pieces
that will not cause structural damage to adjacent elevated structures.
(3)
A deck or patio that has a vertical thickness of more than 12 inches
or that is constructed with more than the minimum amount of fill that
is necessary for site drainage shall not be approved unless an analysis
demonstrates no harmful diversion of floodwaters or wave runup and
wave reflection that would increase damage to adjacent elevated structures.
(4)
A deck or patio that has a vertical thickness of 12 inches or
less and that is at natural grade or on fill material that is similar
to and compatible with local soils and is the minimum amount necessary
for site drainage may be approved without requiring analysis of the
impact on diversion of floodwaters or wave runup and wave reflection.
B.
Other development. Other development activities shall be permitted only if located outside the footprint
of, and not structurally attached to, structures,
and only if an analysis demonstrates no harmful diversion of floodwaters
or wave runup and wave reflection onto adjacent elevated structures. Other development includes but is not limited
to:
