Flood Resistant Design and Construction, ASCE/SEI 24-24

Exclusive Member Benefit: Free Access to ASCE 24-24

New flood standard is now free for ASFPM members (a $165 value)

ASFPM is proud to offer members free digital access to the new ASCE 24-24: Flood Resistant Design and Construction, which establishes minimum requirements for building structures in flood hazard areas. 

Published by the American Society of Civil Engineers, the new ASCE 24-24 redefines how we design and build in flood hazard areas — aligning with the latest data and practices to help communities reduce risk and future losses.

The 2024 edition provides new, recommended minimum standards for flood resistant design and construction of structures that are subject to building code requirements, floodplain management regulations, or other requirements that cite this standard. While not a requirement to be adopted under the NFIP at this time, the new standard nonetheless represents an opportunity for communities to adopt a new national standard that has been through a rigorous consensus process.  

ASCE 24-24 contains significant changes from the previous version, ASCE 24-14, and aligns with the ASCE 7-22 Supplement 2 for design flood loads, which was released in May 2023. The updated standard includes numerous requirements that exceed the NFIP minimums/regulations that have existed since 1973. Communities are encouraged to consider incorporating these requirements into their building code and/or floodplain management ordinance.

Key Updates in ASCE 24-24:

1. Expanded flood hazard area. The flood hazard area is redefined to include the 500-year floodplain (where it is mapped as Shaded X Zone or Zone B or C on some older FIRMs) as well as the 100-year floodplain (SFHA).
2. Elevation requirements are tied to the flood design class of the structure. The assignment of the flood design class is based on a building or structure’s risk to human life, health and welfare if affected by flooding. For most residential, commercial, and industrial structures, this is the 500-year mean recurrence interval (MRI) flood event. For more critical facilities, it goes to 750- or 1000-year. 
3. Climate change considerations. Coastal floodplain calculations must now factor in future sea level change based on historic trends. 
4. Enhanced dry floodproofing requirements. The standard overhauls requirements for dry floodproofing, including the required use of ANSI/FM 2510- certified products and updates to inspection and maintenance needs, and flood emergency operation plans. 

Get Free Access to ASCE 24-24

At ASFPM, we believe that floodplain managers and community officials deserve the best available tools to reduce flood risk. That’s why we’re proud to offer our members free access to the interactive digital version of the ASCE 24-24 standard, a $165 value.

This member benefit underscores ASFPM’s commitment to making critical resources more accessible, and gives our members a head start on adopting this game-changing standard.

Note: Access is limited to 100 concurrent users.
Please log-out when you’re done so other members can access the resource.

Not a Member? Join ASFPM now to gain free digital access to ASCE 24-24.

ADDITIONAL RESOURCES   

Elevation Calculator – The LSU AgCenter has developed an easy-to-use, web-based calculator to determine the required elevations for different flood design classes based on the new ASCE 24-24 requirements.  

Model Ordinance Language for ASCE 24-24 Adoption – Developed by ASFPM, this resource is designed to help state and local officials integrate these standards into their floodplain management regulations. Download

Webinar Recording – Presented by ASFPM’s Non-Structural Floodproofing Committee, this April 2025 webinar provides an overview of the new standard and the key changes. Watch the webinar on-demand here. (The recording is not eligible for CECs).  

To learn more about the standard, visit the ASCE website.