# Nailing, Edge: Building Code Definition > How the IBC 2009 define nailing, edge, where the wording differs, and which chapters depend on the term. - Canonical: https://harth.build/resources/glossary/nailing-edge/ - Last updated: 2026-09-07 - Data source: 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. ## Key facts | Fact | Value | | --- | --- | | Defined in | IBC 2009 (2009 editions transcribed in this corpus) | | Primary source | IBC 2009 Wood (model text, not a jurisdiction's adopted text) | | Chapters using the term | 3 (counted across the codes hosted here) | | Wording identical across codes | Single code (compare before citing one code's wording under another) | ## Direct answer Nailing, edge is a defined term in the International Building Code (IBC) 2009, in Wood. The code's own words are: “A special nailing pattern required by design at the edges of each panel within the assembly of a diaphragm or shear wall.” 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 3 chapters of this corpus, most often in Wood (IBC 2009), Wall Construction (IRC 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. 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](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.* ## What does this term mean? **Nailing, Edge** — IBC 2009, Wood: > A special nailing pattern required by design at the edges of each panel within the assembly of a diaphragm or shear wall. ![Labeled code-term definition diagram: Nailing, Edge: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/nailing-edge/diagram-1344.webp) *How the IBC 2009 define nailing, edge, where the wording differs, and which chapters depend on the term.* ## What must be verified before using this guidance? **Nailing, Edge** is defined once in this corpus, in the [Wood](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/wood.md) chapter of the International Building Code (IBC) 2009: > A special nailing pattern required by design at the edges of each panel within the assembly of a diaphragm or shear wall. ## Where nailing, edge is used in the code The term appears in 3 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next. | Chapter | Code | Mentions | | --- | --- | --- | | [Wood](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/wood.md) | IBC 2009 | 8 | | [Wall Construction](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/wall-construction.md) | IRC 2009 | 3 | | [Definitions](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/definitions.md) | IBC 2009 | 1 | ### The term in use How the code actually writes about nailing, edge, quoted from the 2009 text hosted here: > In Seismic Design Category D, E or F, where shear design values exceed 490 pounds per foot (7154 N/m), all framing members receiving edge nailing from abutting panels shall not be less than a single 3-inch (76 mm) nominal member or two 2-inch (51 mm) nominal members fastened together in accordance with AF&PA NDS to transfer the design shear value … — [IBC 2009 §2307.1.1](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/wood.md) ## The terms nailing, edge is built out of The definition above leans on 2 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what nailing, edge covers: - **[Shear Wall](https://harth.build/resources/glossary/shear-wall.md)** — IBC 2009: A wall designed to resist lateral forces parallel to the plane of a wall. - **[Diaphragm](https://harth.build/resources/glossary/diaphragm.md)** — IBC 2009: A horizontal or sloped system acting to transmit lateral forces to the vertical-resisting elements. ## Nailing, Edge: what to open, and in what order Every row is a document this term depends on. The [ICC code library](https://codes.iccsafe.org/codes) and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) cover the middle rows. | Check | Where | Confirmed | | --- | --- | --- | | Read the definition in the adopted IBC | Wood | | | Re-check the requirement that uses it | Wood (IBC 2009) | | | Re-check the requirement that uses it | Wall Construction (IRC 2009) | | | Re-check the requirement that uses it | Definitions (IBC 2009) | | | Confirm the dependent definition | Shear Wall | | | Confirm the dependent definition | Diaphragm | | | 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](https://harth.build/resources/glossary.md) - [Shear Wall: Building Code Definition](https://harth.build/resources/glossary/shear-wall.md) - [Diaphragm: Building Code Definition](https://harth.build/resources/glossary/diaphragm.md) ## 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](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. ### Source links - [codes.iccsafe.org](https://codes.iccsafe.org/codes) - [iccsafe.org](https://www.iccsafe.org/advocacy/code-adoption-maps/) ## Frequently asked questions ### What is the code definition of nailing, edge? The International Building Code (IBC) 2009 defines it in Wood as: “A special nailing pattern required by design at the edges of each panel within the assembly of a diaphragm or shear wall.” 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 nailing, edge? In this corpus the term is used across 3 chapters, led by Wood 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. --- - Continue in Harth (open this topic in the Harth agent): https://app.harth.build/agent?context=%2Fresources%2Fglossary%2Fnailing-edge%2F - View this page in a browser: https://harth.build/resources/glossary/nailing-edge/ - All resources for agents: https://harth.build/llms.txt