Building Code Glossary
Membrane Penetration: Building Code Definition
How the IBC 2009 define membrane penetration, 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
Membrane penetration is a defined term in the International Building Code (IBC) 2009, in Fire and Smoke Protection Features. The code's own words are: “An opening made through one side (wall, floor or ceiling membrane) of an assembly.” No other I-Code in this corpus defines it, so the IBC 2009 definition is the one to work from. The term is used in 4 chapters of this corpus, most often in Fire and Smoke Protection Features (IBC 2009), Building Planning (IRC 2009), Duct Systems (IMC 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?
Membrane Penetration — IBC 2009, Fire and Smoke Protection Features:
An opening made through one side (wall, floor or ceiling membrane) of an assembly.
What must be verified before using this guidance?
Membrane Penetration is defined once in this corpus, in the Fire and Smoke Protection Features chapter of the International Building Code (IBC) 2009:
An opening made through one side (wall, floor or ceiling membrane) of an assembly.
Where membrane penetration 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 |
|---|---|---|
| Fire and Smoke Protection Features | IBC 2009 | 42 |
| Building Planning | IRC 2009 | 10 |
| Duct Systems | IMC 2009 | 2 |
| Definitions | IBC 2009 | 1 |
Membrane Penetration: 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 | Fire and Smoke Protection Features | |
| 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 | Duct Systems (IMC 2009) | |
| Re-check the requirement that uses it | Definitions (IBC 2009) | |
| 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
- Shaft: Building Code Definition
- Damper: Building Code Definition
- Fire-resistance Rating: Building Code Definition
- Fire Barrier: 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 membrane penetration?
The International Building Code (IBC) 2009 defines it in Fire and Smoke Protection Features as: “An opening made through one side (wall, floor or ceiling membrane) of an assembly.” 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 membrane penetration?
In this corpus the term is used across 4 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 is membrane penetration?
In the 2009 I-Codes hosted here it is a defined term rather than a description. The IBC 2009 states, in Fire and Smoke Protection Features: “An opening made through one side (wall, floor or ceiling membrane) of an assembly.” It is defined in IBC 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.
Related pages
- Medical Gas System: Building Code Definition
Medical Gas System — IPC 2009 definition: The complete system to convey medical gases for direct patient application from central supply systems (bulk …
- Medium-duty Cooking Appliance: Building Code Definition
Medium-duty Cooking Appliance — IMC 2009 definition: Medium-duty cooking appliances include electric discrete element ranges (with or without oven), electric and gas hot-top …
- Membrane-penetration Firestop: Building Code Definition
Membrane-penetration Firestop — IBC 2009 definition: A material, device or construction installed to resist for a prescribed time period the passage of …
- Membrane Structure: Building Code Definition
Membrane Structure — IFC 2009 definition: An air-inflated, air-supported, cable or frame-covered structure as defined by the International BUilding Code and not …
- Merchandise Pad: Building Code Definition
Merchandise Pad — IBC 2009 definition: A merchandise pad is an area for display of merchandise surrounded by aisles, permanent fixtures or …
- Metal Hydride Storage System: Building Code Definition
Metal Hydride Storage System — IFC 2009 definition: A closedsystem consisting of a group of components assembled as a package to contain metal-hydrogen compounds …