Building Code Glossary
Exterior Insulation and Finish Systems (EIFS) with Drainage: Building Code Definition
How the IBC 2009, IRC 2009 define exterior insulation and finish systems (eifs) with drainage, 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
Exterior insulation and finish systems (eifs) with drainage is a defined term in the International Building Code (IBC) 2009, in Exterior Walls. The code's own words are: “An EIFS that incorporates a means of drainage applied over a water-resistive barrier.” The IRC 2009 carries the same definition word for word, so the term means the same thing in each. The term is used in 2 chapters of this corpus, most often in Exterior Walls (IBC 2009), Definitions (IRC 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?
Exterior Insulation and Finish Systems (EIFS) with Drainage — IBC 2009, Exterior Walls:
An EIFS that incorporates a means of drainage applied over a water-resistive barrier.
What must be verified before using this guidance?
Two of the I-Codes in this corpus define Exterior Insulation and Finish Systems (EIFS) with Drainage, in identical words.
| Code | Where it is defined | Definition |
|---|---|---|
| IBC 2009 | Exterior Walls | An EIFS that incorporates a means of drainage applied over a water-resistive barrier. |
| IRC 2009 | Definitions | An EIFS that incorporates a means of drainage applied over a water-resistive barrier. |
Where exterior insulation and finish systems (eifs) with drainage is used in the code
The term appears in 2 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Exterior Walls | IBC 2009 | 2 |
| Definitions | IRC 2009 | 1 |
The term in use
How the code actually writes about exterior insulation and finish systems (eifs) with drainage, quoted from the 2009 text hosted here:
Exterior insulation and finish systems (EIFS) and exterior insulation and finish systems (EIFS) with drainage shall comply with Section 1408.
The terms exterior insulation and finish systems (eifs) with drainage 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 exterior insulation and finish systems (eifs) with drainage covers:
- Water-resistive Barrier — IBC 2009: A material behind an exterior wall covering that is intended to resist liquid water that has penetrated behind the exterior covering from further intruding into the exterior wall assembly.
Exterior Insulation and Finish Systems (EIFS) with Drainage: 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 | Exterior Walls | |
| Read the definition in the adopted IRC | Definitions | |
| Re-check the requirement that uses it | Exterior Walls (IBC 2009) | |
| Re-check the requirement that uses it | Definitions (IRC 2009) | |
| Confirm the dependent definition | Water-resistive Barrier | |
| 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
- Water-resistive Barrier: Building Code Definition
- Exterior Wall: Building Code Definition
- Veneer: Building Code Definition
- Backing: 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 exterior insulation and finish systems (eifs) with drainage?
The International Building Code (IBC) 2009 defines it in Exterior Walls as: “An EIFS that incorporates a means of drainage applied over a water-resistive barrier.” 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 exterior insulation and finish systems (eifs) with drainage?
In this corpus the term is used across 2 chapters, led by Exterior Walls 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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