References to changes to the Flood Provisions:
Flood Provisions of the 6th Edition Florida Building Code
(Including details of changes from 5th Edition Florida Building Code)
Highlights of ASCE 24-14 Flood Resistant Design and Construction
Flood Resistant Construction and the 6th Edition Florida Building Code
(Fact Sheet by Building A Safer Florida, BASF)
Summary of Most Significant FLOOD PROVISION Changes from the 5th Ed. FBC:
1. Coastal A Zone and Limit of Moderate Wave Action: New definitions: CAZ
delineated by LiMWA if on FIRM or if designated by the community. Requires
buildings in CAZ to be designed according to Zone V requirements with two
exceptions: backfilled stemwalls and dry floodproofing (nonresidential only), if
designed to account for wave loads, scour and erosion.2.
FBC, Building requires buildings in SFHA to be designated by Flood Design Class,
per ASCE 24.
3. ASCE 24 updated to 2014 edition.
4. FBC, Residential modified consistent with ASCE 24-14:
Requires minimum elevation of lowest floor (Zone A) or bottom of the lowest
horizontal structural member of the lowest floor (Zone V and CAZ) is BFE + 1
Clarifies flood provisions apply to substantial improvement and repair of
substantial damage and if dwelling in more than one flood zone, the more
restrictive requirements apply.
Specifies determination of net open area of flood openings and separates
installation requirements into new subsection.
Requires all walls to have flood openings, including breakaway walls.
Requires dwellings in Zone V and CAZ to have an exterior door at the top of
stairs that provide access to the dwelling and that are enclosed by walls.
Adds requirements for tanks.
Reduce or avoid flood losses by building above the Base Flood Elevation.
What is Base Flood Elevation?
The Base Flood Elevation (BFE) is the elevation to which floodwater is anticipated to rise during the base flood. BFEs are shown on Flood Insurance Rate Maps and on the flood profiles. The BFE is the regulatory requirement for the elevation of structures. The relationship between the BFE and a structure's elevation determines the flood insurance premium
FEMA form: Elevation Certificate
Structures Below Base Flood Elevation: