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2003 International Residential Code:
Portion of the 2005 State Building Code, State of Connecticut:
R323.3 Coastal high-hazard areas (including V Zones). Areas
that have been determined to be subject to wave heights in excess of
3 feet (914mm) or subject to high velocity wave action or wave induced
erosion shall be designated as coastal high-hazard areas. All buildings
and structures erected in coastal high-hazard areas shall be designed and
constructed in accordance with R323.3.1 through R323.3.6.
R323.3.1 Location and site preparation
1. Buildings and structures shall be located landward of the reach
of mean high tide.
2. For any alteration of sand dunes and mangrove stands the building
official shall require submission of an engineering analysis which demonstrates
that the proposed alteration will not increase the potential for flood
damage.
R323.3.2 Elevation requirements.
1. All buildings and structures erected within coastal high hazard
areas shall be elevated so that the lowest portion of all structural members
supporting the lowest floor, with the exception of a mat or raft foundations,
pilings, pile caps, columns, grade beams and bracing is located at or above
the design flood elevation.
2. Basement floors that are below grade on all sides are prohibited.
3. The use of fill for structural support is prohibited.
4. The placement of fill beneath buildings and structures is prohibited.
Exception: Walls and partitions enclosing areas below the design flood
elevation shall meet the requirements of sections R323.3.4 and R323.3.5.
R323.3.3 Foundations
All buildings and structures erected in coastal high hazard areas shall
be supported on pilings or columns and shall be adequately anchored to such
pilings or columns. Pilings shall have adequate soil penetration to
resist the combined wave and wind loads (lateral and uplift). Water
loading values used shall be those associated with the design flood. Wind
loading values shall be those required by this code. Pile embedment
shall include consideration of decreased resistance capacity caused by
scour of soil strata surrounding the piling. Pile systems design
and installation shall be certified in accordance with Section R323.3.6.
mat, raft or other foundations that support columns shall not be permitted
where soil investigations that are required in accordance with section R401.4
indicate that soil material under the mat, raft or other foundation is subject
to scour or erosion from wave-velocity flow conditions.
R323.3.4 Walls below design flood elevation. Walls
and partitions are permitted below the elevated floor provided that such
walls and partitions are not part of the structural support of the building
or structure and:
1. Electrical, mechanical and plumbing system components are
not to be mounted on or penetrate through walls that are designed to break
away under flood loads, and
2. Are constructed with insect screening or open lattice, o;
3. Are 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 (.048 kN/m2),
and no more than 20 pounds per square foot (0.96 kN/m2); or
4. Where wind loading values of this code exceed 20 pounds per square
foot (0.96 kN/m2), the construction documents shall include documentation
prepared and sealed by a registered design professional that:
4.1 The walls and partitions below the design flood elevation
have been designed to collapse from a waterload less than that which would
occur during the design flood.
2.4 The elevated portion of the building and supporting foundation
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 design
flood. Wind loading values shall be those required by code.
R323.3.5 Enclosed area below flood elevation. Enclosed
areas below flood elevation shall be used solely for parking of vehicles,
building access or storage.
R323.3.6 Construction documents. The construction documents
shall include documentation that is prepared and sealed by a registered
design professional that the design and methods of construction to be used
meet the applicable criteria of this section.
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