ASCE 7-16 vs. ASCE 7-22: What Changed? (2026)

Direct answer

ASCE/SEI 7-22, released in December 2021, is the edition of Minimum Design Loads and Associated Criteria for Buildings and Other Structures referenced by the 2024 IBC; the 2018 and 2021 IBC reference ASCE 7-16. The 2022 edition adds Chapter 32, which requires tornado loads for Risk Category III and IV buildings in the tornado-prone region unless the tornado speed is below 60 mph. Ground snow loads became reliability-targeted, strength-level values with separate maps for each risk category, so the snow importance factor was removed and the LRFD snow load factor dropped from 1.6 to 1.0. Seismic design moved to multi-period response spectra at 22 periods, eliminating the Fa and Fv site coefficients and adding site classes BC, CD and DE. Wind, rain, ice, tsunami and nonstructural component provisions also changed. The edition you must use is the one referenced by the building code your jurisdiction has adopted, not simply the newest one.

Content and cited inputs reviewed by Harth team · Published 2026-08-18 · Updated 2026-10-27.

What are the key takeaways?

• Use the ASCE 7 edition your adopted building code references: 7-16 with the 2018 or 2021 IBC, 7-22 with the 2024 IBC.
• ASCE 7-22 adds tornado loads for Risk Category III and IV buildings in the tornado-prone region.
• Snow loads are now strength-level and mapped per risk category, so load combinations use 1.0S, not 1.6S.
• Seismic site factors Fa and Fv are gone; read multi-period spectra from the USGS or ASCE tools.

What are the key differences between ASCE 7-16 and ASCE 7-22?

ASCE/SEI 7 sets the minimum loads that US building codes require structures to resist. The 2022 edition (ASCE 7-22) was released in December 2021 and is referenced by the 2024 IBC; the 2016 edition (ASCE 7-16) is referenced by the 2018 and 2021 IBC. The changes reach almost every environmental load:

Which edition do I have to use?

The edition is set by the building code your jurisdiction adopted, not by publication date. ASCE 7 enters law by reference: IBC Chapter 16 points to a specific edition, and that edition governs wherever that IBC is in force.

Many states are still on the 2018 or 2021 IBC, and some amend the structural chapter. Mixing editions, for example taking ASCE 7-22 snow loads into an ASCE 7-16 design, needs the building official's approval as an alternative, because the load factors and combinations were recalibrated together.

What changed in seismic design?

ASCE 7-22 replaced the two-point spectrum with multi-period response spectra (MPRS). The USGS web service for ASCE 7-22 returns design and MCER spectra at 22 periods from 0 to 10 seconds, together with SDS, SD1 and the seismic design category. Because site amplification is built into those values, the Fa and Fv coefficient tables are gone, and three intermediate site classes, BC, CD and DE, were added. When soil data are not available, the default is the most critical of Site Classes C, CD and D at each period.

This fixes a practical problem in ASCE 7-16. Under ASCE 7-16, Section 11.4.8 generally requires a site-specific ground motion hazard analysis for Site Class D sites where S1 is 0.2 g or greater, unless an exception is used. The USGS ASCE 7-16 service therefore returns no Fv and no SD1 for those sites, which include five of the six reference points in the comparison table below. ASCE 7-22 provides SD1 directly; the comparison table below shows the effect.

Chapter 13 also changed for nonstructural components. The component amplification factor ap and response modification factor Rp were replaced by a resonance factor CAR, a component strength factor Rpo, a height factor Hf and a structure ductility factor Rμ, so anchorage forces for equipment, cladding and partitions need recalculating rather than updating.

What changed in snow loads?

ASCE 7-22 adopted reliability-targeted ground snow loads, intended to fix the uneven reliability of roofs designed to the 50-year snow load in different parts of the country. There is a ground snow load map for each risk category, so the separate snow importance factor was removed. The values are strength-level, so the LRFD load factor on snow drops from 1.6 to 1.0, and allowable stress design uses a 0.7 factor to give roughly equivalent strength. Drift calculations add a winter wind parameter, W2, the share of time from October to April with wind speed of at least 10 mph. The 2024 IBC added Section 1608.2.1 to convert the strength-level values to equivalent ASD values.

What are tornado loads in ASCE 7-22?

Chapter 32 is the first time ASCE 7 has required design for tornadoes. It applies to Risk Category III and IV buildings and other structures in the tornado-prone region, which IBC Figure 1609.5 shows roughly as the US east of the Continental Divide. Tornado speeds use the same mean recurrence intervals as the Chapter 26 wind speeds for those categories, 1,700 years for Risk Category III and 3,000 years for Risk Category IV. Where the mapped tornado speed is below 60 mph, tornado design is not required. Risk Category I and II buildings are excluded because, at their shorter return periods, tornado loads generally do not control over Chapter 26 wind loads. Tornado loads are checked alongside ordinary wind loads; they do not automatically govern.

What does this mean for architects?

Most changes land on the structural engineer, but several reach the architect's decisions early: the risk category assigned to a school, hospital or assembly building now decides whether tornado loads apply and which snow map is used; site class and geotechnical scope affect seismic values; and rooftop equipment, canopies, cladding and partitions need anchorage designed to the new Chapter 13. Confirm the governing ASCE 7 edition in the code analysis at concept stage, and ask the engineer which hazard changes affect the structural system.

Same site, two editions: USGS seismic design values compared

Harth queried the USGS Seismic Design Web Services on 2026-10-27 for six city-centre reference points, using Risk Category II and Site Class D in both editions so the only variable is the standard. Coordinates are reference points, not project sites; a real project needs its own coordinates, site class and geotechnical data.

What the comparison shows:

• At the five higher-hazard points, ASCE 7-16 with Site Class D leaves SD1 to a site-specific analysis (the USGS service returns Fv as "See Section 11.4.8"), while ASCE 7-22 gives a usable SD1 directly.
• SDS rose under ASCE 7-22 at Los Angeles, Seattle and Salt Lake City and fell at Charleston and Boston; at Memphis it was nearly unchanged. Do not assume a new edition always raises or lowers seismic demand.
• With an unknown site class in ASCE 7-22 (the default, taken as the most critical of C, CD and D), the Los Angeles point returns SDS 1.58 g and SD1 1.11 g, higher than Site Class D alone at short periods.

ASCE 7-16 to ASCE 7-22 transition checklist

Where can you explore related guidance?

• Explore all comparisons guidance
• IBC vs. IRC: Which Building Code Applies? (2026)
• Seismic Design Category & Site Class Explained (SDC A–F)
• Ground Snow Load (pg) Explained for Architects
• Design Wind Speed (Vult), Risk Category Maps & Exposure B/C/D

Sources and method

Compiled from ASCE, ICC and USGS sources, checked 2026-10-27: the ASCE/SEI 7-22 publication page (title, scope and list of new provisions); ICC's Building Safety Journal, Release of ASCE/SEI 7-22 brings important changes (release date and change list); STRUCTURE magazine, 2024 IBC significant structural changes, part 6: loads (IBC 2024 Sections 1608, 1609.5 and 1611, tornado thresholds and recurrence intervals) and Snow and rain loads in ASCE 7-22 (reliability-targeted snow, load factor and W2). Seismic values were retrieved from the USGS Seismic Design Web Services for ASCE 7-16 and ASCE 7-22; snow, wind, ice, rain and tornado values are available from the ASCE Hazard Tool. These are edition-level orientation notes, not design values: read every provision in the edition your adopted building code references and confirm with the structural engineer of record.

Source links

• asce.org

• iccsafe.org

• structuremag.org

• structuremag.org

• earthquake.usgs.gov

• ascehazardtool.org