Building Code Glossary
Exposed: Building Code Definition
How the IRC 2009 define exposed, 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
Exposed is a defined term in the International Residential Code (IRC) 2009, in Electrical Definitions. The code's own words are: “(As applied to live parts.) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts not suitably guarded, isolated or insulated.” No other I-Code in this corpus defines it, so the IRC 2009 definition is the one to work from. The term is used in 87 chapters of this corpus, most often in Fire and Smoke Protection Features (IBC 2009), Building Planning (IRC 2009), Wood (IBC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted. Record the jurisdiction, the adopted edition, the application date and any local amendment that rewrites the definition before you use it on a live project, because a term redefined by amendment changes every requirement that depends on it.
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?
Exposed — IRC 2009, Electrical Definitions:
(As applied to live parts.) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts not suitably guarded, isolated or insulated.
What must be verified before using this guidance?
Exposed is defined once in this corpus, in the Electrical Definitions chapter of the International Residential Code (IRC) 2009:
(As applied to live parts.) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts not suitably guarded, isolated or insulated.
Where exposed is used in the code
The term appears in 87 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Fire and Smoke Protection Features | IBC 2009 | 92 |
| Building Planning | IRC 2009 | 61 |
| Wood | IBC 2009 | 47 |
| Duct Systems | IMC 2009 | 34 |
| Glass and Glazing | IBC 2009 | 32 |
| Foundations | IRC 2009 | 19 |
| Fuel Gas | IRC 2009 | 19 |
| Roof-ceiling Construction | IRC 2009 | 14 |
| Exterior Walls | IBC 2009 | 12 |
| Administration | IECC 2009 | 12 |
| Wall Construction | IRC 2009 | 12 |
| Fire Protection Systems | IBC 2009 | 11 |
75 further chapters mention the term.
The term in use
How the code actually writes about exposed, quoted from the 2009 text hosted here:
Interior walls and partitions of nonsymmetrical construction shall be tested with both faces exposed to the furnace, and the assigned fire-resistance rating shall be the shortest duration obtained from the two tests conducted in compliance with ASTM E 119 or UL 263.
All exposed insulation materials installed on attic floors shall have a critical radiant flux not less than 0.12 watt per square centimeter.
Where fire-retardant-treated wood is exposed to weather, or damp or wet locations, it shall be identified as "Exterior" to indicate there is no increase in the listed flame spread index as defined in Section 2303.2 when subjected to ASTM D 2898.
The terms exposed is built out of
The definition above leans on 3 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what exposed covers:
- Isolated — IRC 2009: (As applied to location.) Not readily accessible to persons unless special means for access are used.
- Guarded — IRC 2009: Covered, shielded, fenced, enclosed or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger.
- Person — IBC 2009: An individual, heirs, executors, administrators or assigns, and also includes a firm, partnership or corporation, its or their successors or assigns, or the agent of any of the aforesaid.
Exposed: 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 IRC | Electrical Definitions | |
| Re-check the requirement that uses it | Fire and Smoke Protection Features (IBC 2009) | |
| Re-check the requirement that uses it | Building Planning (IRC 2009) | |
| Re-check the requirement that uses it | Wood (IBC 2009) | |
| Re-check the requirement that uses it | Duct Systems (IMC 2009) | |
| Confirm the dependent definition | Isolated | |
| Confirm the dependent definition | Guarded | |
| Confirm the dependent definition | Person | |
| 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
- Isolated: Building Code Definition
- Guarded: Building Code Definition
- Person: 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 exposed?
The International Residential Code (IRC) 2009 defines it in Electrical Definitions as: “(As applied to live parts.) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts not suitably guarded, isolated or insulated.” 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 exposed?
In this corpus the term is used across 87 chapters, led by Fire and Smoke Protection Features 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.
What are the different types of building codes?
Building is a separate defined term. The IBC 2009 defines it as: “Any structure used or intended for supporting or sheltering any use or occupancy.” That is not the same as exposed, which the IRC 2009 defines as “(As applied to live parts.) Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts not suitably guarded, isolated or insulated.” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.
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