Building Code Glossary
Interior Floor-wall Base: Building Code Definition
How the IBC 2009, IFC 2009 define interior floor-wall base, 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
Interior floor-wall base is a defined term in the International Building Code (IBC) 2009, in Interior Finishes. The code's own words are: “Interior floor finish trim used to provide a functional and/or decorative border at the intersection of walls and floors.” The IFC 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 4 chapters of this corpus, most often in Interior Finishes (IBC 2009), Interior Finish, Decorative Materials and Furnishings (IFC 2009), Definitions (IBC 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?
Interior Floor-wall Base — IBC 2009, Interior Finishes:
Interior floor finish trim used to provide a functional and/or decorative border at the intersection of walls and floors.
What must be verified before using this guidance?
Two of the I-Codes in this corpus define Interior Floor-wall Base, and the wording is not identical — read the version that governs your question.
| Code | Where it is defined | Definition |
|---|---|---|
| IBC 2009 | Interior Finishes | Interior floor finish trim used to provide a functional and/or decorative border at the intersection of walls and floors. |
| IFC 2009 | Interior Finish, Decorative Materials and Furnishings | Interior floor finish trim used to provide a functional or decorative border at the intersection of walls and floors. |
Where interior floor-wall base is used in the code
The term appears in 4 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Interior Finishes | IBC 2009 | 3 |
| Interior Finish, Decorative Materials and Furnishings | IFC 2009 | 3 |
| Definitions | IBC 2009 | 1 |
| Definitions | IFC 2009 | 1 |
The term in use
How the code actually writes about interior floor-wall base, quoted from the 2009 text hosted here:
Interior floor-wall base that is 6 inches (152 mm) or less in height shall be tested in accordance with NFPA 253 and shall not be less than Class II.
Interior floor-wall base that is 6 inches (152 mm) or less in height shall be tested in accordance with Section 804.2 and shall not be less than Class II.
The terms interior floor-wall base is built out of
The definition above leans on 1 other defined term. Each carries its own code definition, and a local amendment to any of them changes what interior floor-wall base covers:
- Interior Floor Finish — IBC 2009: The exposed floor surfaces of buildings including coverings applied over a finished floor or stair, including risers.
Interior Floor-wall Base: 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 | Interior Finishes | |
| Read the definition in the adopted IFC | Interior Finish, Decorative Materials and Furnishings | |
| Re-check the requirement that uses it | Interior Finishes (IBC 2009) | |
| Re-check the requirement that uses it | Interior Finish, Decorative Materials and Furnishings (IFC 2009) | |
| Re-check the requirement that uses it | Definitions (IBC 2009) | |
| Re-check the requirement that uses it | Definitions (IFC 2009) | |
| Confirm the dependent definition | Interior Floor Finish | |
| 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
- Interior Floor Finish: Building Code Definition
- Flame Spread Index: Building Code Definition
- Trim: Building Code Definition
- Smoke-developed Index: 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 interior floor-wall base?
The International Building Code (IBC) 2009 defines it in Interior Finishes as: “Interior floor finish trim used to provide a functional and/or decorative border at the intersection of walls and floors.” 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 interior floor-wall base?
In this corpus the term is used across 4 chapters, led by Interior Finishes in the IBC 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.
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