Building Code Glossary
Cripple Wall: Building Code Definition
How the IBC 2009, IRC 2009 define cripple wall, where the wording differs, and which chapters depend on the term.
On this page
Last updated September 7, 2026 · Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.
Direct answer
Cripple wall is a defined term in the International Building Code (IBC) 2009, in Wood. The code's own words are: “A framed stud wall extending from the top of the foundation to the underside of floor framing for the lowest occupied floor level.” The IRC 2009 defines the same term with different wording, so the controlling text depends on which code governs the question in front of you — the comparison below sets the versions side by side. The term is used in 5 chapters of this corpus, most often in Wall Construction (IRC 2009), Wood (IBC 2009), Foundations (IRC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted.
Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.
What does this term mean?
Cripple Wall — IBC 2009, Wood:
A framed stud wall extending from the top of the foundation to the underside of floor framing for the lowest occupied floor level.
What must be verified before using this guidance?
Two of the I-Codes in this corpus define Cripple Wall, and the wording is not identical — read the version that governs your question.
| Code | Where it is defined | Definition |
|---|---|---|
| IBC 2009 | Wood | A framed stud wall extending from the top of the foundation to the underside of floor framing for the lowest occupied floor level. |
| IRC 2009 | Definitions | A framed wall extending from the top of the foundation to the underside of the floor framing of the first story above grade plane. |
Where cripple wall is used in the code
The term appears in 5 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Wall Construction | IRC 2009 | 39 |
| Wood | IBC 2009 | 34 |
| Foundations | IRC 2009 | 3 |
| Definitions | IBC 2009 | 1 |
| Definitions | IRC 2009 | 1 |
The term in use
How the code actually writes about cripple wall, quoted from the 2009 text hosted here:
In addition to the requirements of Section R602.10.9, where braced wall lines at interior walls occur without a continuous foundation below, the length of parallel exterior cripple wall bracing shall be 1½ times the length required by Tables R602.10.1.2(1) and R602.10.1.2(2).
along the foundation plate and the top plate of the cripple wall.
The terms cripple wall is built out of
The definition above leans on 4 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what cripple wall covers:
- Story Above Grade Plane — IBC 2009: Any story having its finished floor surface entirely above grade plane, or in which the finished surface of the floor next above is:
- Grade Plane — IBC 2009: A reference plane representing the average of finished ground level adjoining the building at exterior walls.
- Story — IBC 2009: That portion ofa building included between the upper surface of a floor and the upper surface of the floor or roof next above (also see "Basement," "Mezzanine" and Section 502.1).
- Grade — IRC 2009: The finished ground level adjoining the building at all exterior walls.
Cripple Wall: what to open, and in what order
Every row is a document this term depends on. The ICC code library and the ICC adoption maps cover the middle rows.
| Check | Where | Confirmed |
|---|---|---|
| Read the definition in the adopted IBC | Wood | |
| Read the definition in the adopted IRC | Definitions | |
| Re-check the requirement that uses it | Wall Construction (IRC 2009) | |
| Re-check the requirement that uses it | Wood (IBC 2009) | |
| Re-check the requirement that uses it | Foundations (IRC 2009) | |
| Re-check the requirement that uses it | Definitions (IBC 2009) | |
| Confirm the dependent definition | Story Above Grade Plane | |
| Confirm the dependent definition | Grade Plane | |
| Confirm the dependent definition | Story | |
| Local amendment to any of the above | Jurisdiction's amendment list |
A research aid, not a code determination. The authority having jurisdiction decides which edition and which amendments apply.
Where can you explore related guidance?
- Explore all glossary guidance
- Story Above Grade Plane: Building Code Definition
- Grade Plane: Building Code Definition
- Story: Building Code Definition
- Grade: Building Code Definition
Sources and method
Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The ICC code library publishes the current model text and the ICC adoption maps show which edition a jurisdiction has adopted; those sources control.
Source links
Frequently asked questions
What is the code definition of cripple wall?
The International Building Code (IBC) 2009 defines it in Wood as: “A framed stud wall extending from the top of the foundation to the underside of floor framing for the lowest occupied floor level.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.
Which parts of the code depend on cripple wall?
In this corpus the term is used across 5 chapters, led by Wall Construction in the IRC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.
What is the definition of a cripple wall?
In the 2009 I-Codes hosted here it is a defined term rather than a description. The IBC 2009 states, in Wood: “A framed stud wall extending from the top of the foundation to the underside of floor framing for the lowest occupied floor level.” It is defined in IBC 2009, IRC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.
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