ASCE Standards For FEMA: A Practical Guide To Flood Loads And Flood-Resistant Design

Executive Summary

If you work on FEMA-funded mitigation, recovery, or resilience projects, “ASCE standards for FEMA” is shorthand for a very practical reality: FEMA programs and policies often lean on consensus standards to define “hazard-resistant” design in flood and seismic contexts. The ASCE Library’s Standards webpage highlights this connection by pointing practitioners toward key ASCE codes and standards used across the resilience value chain (ASCE, n.d.).

What “ASCE Standards for FEMA” Means

When people search for ASCE standards for FEMA, they’re typically trying to answer one of three questions: Which flood loads should I design for, what “flood-resistant” construction details are expected, and how do I evaluate or retrofit an existing building for earthquake performance. Those questions map cleanly to ASCE/SEI 7 (loads), ASCE/SEI 24 (flood-resistant design and construction), and ASCE/SEI 41 (seismic evaluation and retrofit for existing buildings) (ASCE, 2023; ASCE, 2025).

Why FEMA Cares About Consensus-Based Codes and Standards

A key driver is federal policy direction: DRRA Section 1235(b) authorizes FEMA Public Assistance to fund repair or replacement in conformity with “the latest published editions of relevant consensus-based codes, specifications, and standards” that incorporate hazard-resistant design (CRS, 2021). That framing helps explain why FEMA programs and guidance so often reference up-to-date engineering standards rather than reinventing technical criteria program by program (CRS, 2021; CRS, 2023).

Quick Answer: Which ASCE Standard Should You Use?

Use this as a fast routing guide for common FEMA-adjacent decisions (ASCE, 2023; ASCE, 2025; FEMA, 2015).

• Flood hazard and flood load calculations for buildings: ASCE/SEI 7-22 Supplement 2 (Flood Loads);
• Flood-resistant design and construction requirements (elevation, utilities, materials, floodproofing rules): ASCE/SEI 24 (latest edition is ASCE/SEI 24-24);
• FEMA HMA elevation, dry floodproofing, and mitigation reconstruction (minimum criteria in older guidance): ASCE/SEI 24-14 (or later, where accepted), and;
• Seismic evaluation and retrofit of existing buildings: ASCE/SEI 41-23.

Flood Loads: ASCE 7-22 Supplement 2 Moves Beyond The 100-Year Flood

ASCE has emphasized that ASCE 7-22 Supplement 2 is a major update to flood load provisions, with a shift toward risk-category-based design and a move to using the 500-year floodplain for Risk Category II structures and above when determining flood loads (ASCE, 2023). The supplement also introduces a requirement to include relative sea-level change over the service life of the structure in coastal settings (ASCE, 2023).

Flood-Resistant Design: ASCE 24-24 Connects Loads to Real-World Construction Decisions

ASCE/SEI 24-24 is positioned as a comprehensive flood-resilience standard: it establishes minimum requirements for building structures in high-risk flood areas, specifies minimum construction standards and materials, and incorporates requirements tied to the National Flood Insurance Program and FEMA (ASCE, 2025). ASCE also notes that ASCE 24 is intended to meet or exceed NFIP requirements and has been updated to align with ASCE 7-22 Supplement 2 (ASCE, 2025; Coulbourne et al., 2025).

FEMA Hazard Mitigation Assistance: Where ASCE 24 Shows Up As A Minimum Design Requirement

FEMA’s Hazard Mitigation Assistance Guidance (including the 2/27/2015 version and addendum) explicitly incorporates ASCE 24-14 as a minimum design requirement for certain flood risk reduction activities (FEMA, 2015). Specifically, it states FEMA will use ASCE 24-14 (or latest edition, or equivalent) as the minimum design criteria for HMA-funded structure elevation, dry floodproofing, and mitigation reconstruction projects in flood hazard areas, and it also describes pre-award certification and post-award documentation expectations tied to ASCE 24 conformance (FEMA, 2015).

Building Codes Policy Context: FEMA Programs Are Not All The Same

It’s also important to recognize that FEMA’s building-code and standards requirements can vary by program and statutory authority, and they have evolved over time. Congressional Research Service reporting summarizes FEMA’s building codes policies and the role of requirements like ASCE 24 and federal flood risk standards across programs, which is why project teams should always confirm the specific NOFO, guidance, and award conditions for the funding stream they are using (CRS, 2023).

Frequently Asked Questions (FAQs)

1. What is the ASCE Standards FEMA page trying to help with? It’s an ASCE Library landing page that frames resilience through the lens of ASCE codes and standards, helping practitioners quickly identify which standards matter most in FEMA-adjacent work (ASCE, n.d.).
2. Does ASCE 7-22 Supplement 2 require designing to the 500-year flood? For many structures, yes: ASCE has explained that Risk Category II structures and above use the 500-year floodplain to determine flood loads under the new flood load provisions (ASCE, 2023).
3. How does sea-level change factor into flood design under newer standards? ASCE has stated that ASCE 7-22 Supplement 2 introduces a requirement for relative sea-level change tied to the structure and that sea-level rise over the service life must be incorporated in flood design considerations for coastal flooding (ASCE, 2023).
4. Where does FEMA explicitly require ASCE 24 in mitigation work? In FEMA’s Hazard Mitigation Assistance Guidance (2/27/2015), FEMA specifies ASCE 24-14 (or latest edition/equivalent) as the minimum design criteria for HMA-funded structure elevation, dry floodproofing, and mitigation reconstruction projects in flood hazard areas (FEMA, 2015).
5. What’s the simplest way to explain ASCE 41-23 to a non-engineering stakeholder? ASCE 41 is a performance-based standard used to evaluate and retrofit existing buildings for earthquake hazards, offering tiered approaches that can scale from screening-level checks to more detailed engineering analysis (ASCE, 2023).

Sources

• American Society of Civil Engineers. (n.d.). Resilience requires ASCE codes and standards (ASCE standards for FEMA landing page).
• American Society of Civil Engineers. (2023, May 25). New addition to the ASCE/SEI 7-22 Standard protects buildings from a 500-year flood event. Civil Engineering Source.
• American Society of Civil Engineers. (2023, May 31). New ASCE 7-22 supplement on flood loads now available as free download. Civil Engineering Source.
• American Society of Civil Engineers. (2023, December 1). ASCE 41-23 provides significant updates to requirements for seismic evaluation and retrofit of existing buildings. Civil Engineering Source.
• American Society of Civil Engineers. (2025, January 23). Advancing flood-resistant design: The ASCE/SEI Flood Resistant Design and Construction Standards Committee. Structural Engineering Institute News.
• American Society of Civil Engineers. (2025, March 20). Protect structures from flood risks with new ASCE standard. Civil Engineering Source.
• Congressional Research Service. (2021, April 27). The Disaster Recovery Reform Act of 2018 (DRRA): Implementation update tables for select provisions (R46774). Congress.gov.
• Congressional Research Service. (2023, October 17). Building resilience: FEMA’s building codes policies and considerations for Congress (R47612). Congress.gov.
• Coulbourne, W. L., Mandrick, J., & Reeder, A. (2025, May 30). Major revisions to ASCE 24—A standard for flood-resistant design and construction. STRUCTURE Magazine.
• Coulbourne, W. L., Cox, D., & Mandrick, J. (2024, August 1). Major changes to ASCE 7-22 flood loads. STRUCTURE Magazine.
• Federal Emergency Management Agency. (2015, February 27). Hazard Mitigation Assistance guidance (including addendum).

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