On July 21, 2026, nine members of a U.S. Marshals Service task force lined up outside an apartment door in Huntsville, Missouri, to serve an arrest warrant. Seconds later, the second-story wooden deck beneath them collapsed.
Body camera footage shows all nine officers dropping straight down in a heap of splintered lumber. Seven were treated at the hospital with broken bones and injuries consistent with what the U.S. Marshal for the Eastern District of Missouri called “a pretty serious fall.” None of their weapons discharged. The suspect was arrested later that day.
The investigation into what caused the deck to fail is ongoing. But for building inspectors, the footage is a stark reminder: decks kill people when they fail. And the 2024 International Residential Code — the edition South Carolina will begin enforcing on January 1, 2027 — brings the most significant deck construction changes in years.
Here are five changes in the 2024 IRC that matter most for field inspectors.
1. Ledger Flashing Now Has Teeth
Ledger failures are one of the leading causes of deck collapses. When water gets behind the ledger board and rots the connection, the deck pulls away from the house — and everything on it comes down.
The 2021 IRC offered limited guidance on ledger flashing, which meant inconsistent enforcement and, frankly, inconsistent installations.
The 2024 IRC changes that. Deck ledger flashing must now be installed tight to the weather-resistive barrier (WRB) and extend at least 2 inches above the top of the ledger. On remodels where no WRB exists behind the exterior wall, one must be installed in the area behind the new ledger before flashing integration.
Flashing can either lace shingle-fashion into the WRB laps or be sealed to the face of the WRB using a self-adhering membrane.
What this means in the field: Inspectors now have specific, enforceable language. A bead of caulk and a piece of Z-flashing that stops short won’t cut it anymore.
2. Guard Posts Get Structural Backup
The 2024 IRC adds a requirement that should have been there all along: roll blocking or a reinforced joist is now required at every guard post location on a deck.
Previously, guard posts were often nailed or bolted to rim joists with no additional structural reinforcement. That’s how you get a guardrail that fails when someone leans on it.
What this means in the field: When you inspect a deck guard, the connection between the post and the framing below it is no longer just a hardware question — it’s a framing geometry question. If there’s no blocking or reinforced joist at the post location, that’s a correction.
3. Stair Landings Get a Low-Rise Exception
The IRC has long required stair landings to be at least as wide as the stairway — no exceptions. The 2024 IRC adds one.
For low-rise decks with three or fewer risers, a 36-inch landing is now permitted. This is a practical change that acknowledges a 4-foot-wide landing at the bottom of two steps on a residential deck was always overkill.
What this means in the field: If a builder has a small landing at the base of a short stair run, check the riser count first. Three or fewer risers? 36 inches is compliant. Four or more? The old rule still applies.
4. Beam Sizing Tables Expanded
The 2021 IRC beam tables assumed every joist had a maximum cantilever, which forced builders to oversize beams on decks that didn’t need it.
The 2024 IRC expanded the beam span tables to show multiple combinations of joist span and cantilever that produce the same beam load. A beam supporting a 10-foot joist span with a 2.5-foot cantilever, a 12-foot span with a 1-foot cantilever, and a 14-foot span with no cantilever now all fall under the same column.
What this means in the field: Right-sized beams are now easier to specify and inspect. When you’re checking a beam against the span table, make sure you’re looking at the 2024 IRC tables — the 2021 tables will give you different answers.
5. Composite Decking Must Meet ASTM D7032
The 2024 IRC tightens the requirements for composite decking. Products must now meet ASTM D7032, and the joist spacing must match the manufacturer’s product specification.
This may not seem like a big deal, but it closes a gap where composite decking was sometimes installed at joist spacings designed for wood — and then sagged, cracked, or failed.
What this means in the field: When inspecting a deck with composite decking, verify the joist spacing matches what the product listing specifies. If the manufacturer allows 16-inch on center but the deck has 24-inch framing, that’s a correction — even if the decking looks fine on day one.
The Bottom Line
When that deck in Huntsville dropped nine federal officers like an elevator with no cable, it made national news. But deck failures happen every year — on homes, apartments, restaurants, and porches across the country. Most of them don’t make the evening news.
The 2024 IRC deck changes reflect real-world failure patterns. Ledger flashing, guard post connections, and composite decking joist spacing are all things that have caused decks to fail. The code is catching up to what experienced inspectors already knew.
If you’re an inspector in South Carolina — or any state moving to the 2024 IRC — now is the time to get ahead of these changes. The code becomes enforceable January 1, 2027, but builders are already starting to build to the new standard.
Live Oak Code Consultants offers code consulting and education for inspectors, contractors, and building departments preparing for the 2024 IRC transition. Visit liveoakcode.com/consulting to learn more.
John Calloway, Senior Digital Advisor, Live Oak Code Consultants LLC
Rooted in Code. Built on Integrity.
Want to talk code with other inspectors? Continue the conversation at branches-live-oak.com.