Calculating Minimum Finish Floor Elevation(FFE)DJA 9/08/16
CITY OF ATLANTIC BEACH
800 SEMINOLE ROAD ATLANTIC BEACH, FL 32233 (904) 247-5800
CALCULATING MINIMUM FINISH FLOOR ELEVATION (FFE)
Depending on the location, the minimum Finish Floor Elevation (FFE) for new construction is calculated three different ways in the City of Atlantic Beach. A proposed site plan is necessary to calculate FFE. The final minimum FFE must be the highest of the three methods.
NON FLOOD ZONES:
1. City of Atlantic Beach.
Per COAB LDR, Section 24-251(c), the minimum FFE, in the City of Atlantic Beach, is 7.5 feet above mean sea level (NAVD 1988). 2. Florida Building Code. Per FBC-R 403.1.7.3, the FFE must extend above the elevation of the street gutter 1-FOOT plus 2% slope (HEIGHT ABOVE STREET) (See examples in table below)
HEIGHT ABOVE STREET:
2% at 20 feet from street = .4 feet Total height above street = 1.4 feet
2% at 30 feet from street = .6 feet Total height above street = 1.6 feet 2% at 40 feet from street = .8 feet Total height above street = 1.8 feet In non-flood zones, minimum FFE must be above 7.5 feet (NAVD) and at least the appropriate HEIGHT ABOVE STREET in front of the building, whichever is higher. FLOOD ZONES: 3. Per COAB LDR, Section 24-251(c), the FFE must be 2.5 feet above the Base
Flood Elevation (BFE) or, in an A Zone, 4.5 feet above the highest adjacent
grade and at least the appropriate HEIGHT ABOVE STREET, whichever is higher.
The BFE for any location can be found on the 7/29/2016 Flood Insurance Rate
Map (FIRM).
* Other Code provisions may apply.