InstaBidsInstaBids
Skip to content
InstaBids
Menu
Use your AIConnector, agent API and ready promptsOpen in ChatGPTOpen in ClaudeOpen in GrokOpen in GeminiCopies the prompt, then opens
Add InstaBids to ClaudeMCP connector, sign in onceSteps for every assistantFor AI agents
How InstaBids works
Use your AIStart my request

What is a ridge board?

A ridge board is the board connecting opposing rafters at a roof’s peak. Virginia’s archived 2018 regulatory text, R802.3, specifies at least 1 inch nominal thickness and depth covering the rafter’s cut end. Lower rafter ties resist outward thrust; a roof without adequate ties needs a ridge beam instead.

InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.

By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. Compare the ridge-board depth and rafter cut-end depth shown on the roof detail; request a dimensioned revision if the board does not cover the cut end. Source: Virginia Regulatory Town Hall, read 2026-11-04.
  2. Mark the upper-third collar ties on an existing roof drawing or photograph so the proposed ridge connection can be identified. Source: American Wood Council, read 2026-11-04.
  3. Request a written ridge-connection detail naming the connection arrangement and fastening table, so the reply specifies how the opposing rafters connect. Source: Virginia Regulatory Town Hall, read 2026-11-04.
  4. For a proposed ridge beam, request a support drawing tracing its roof loads through supporting structural elements to the foundation. Source: Greene County, Missouri, read 2026-11-04.
InstaBids assistantAI · builds your written scope with you

What ridge board job do you need done in your home? Describe it once to start your written scope.

Start from a common job
You choose who gets your number
Or send it from your own AIChatGPTClaudeGrokGeminiMore ways
  1. Describe it onceBy chat, or through your own AI assistant, and add photos.
  2. Post it and send itContractors bid in writing on that scope.
  3. Compare line by lineEvery quote is written against the same scope.
  4. You chooseContact details stay hidden until you pick and they confirm.
InstaBids

For your AI assistant

MCP connector · REST API · plain HTML

Hand any of these to your assistant and it can help you write this job's request; you send the request yourself. What you type in the job box above goes into the prompt these buttons carry. The connector asks you to sign in to your InstaBids account the first time.

  • MCP connector URLhttps://instabids.ai/api/agent/mcp
  • Agent API (OpenAPI)https://instabids.ai/openapi.json
  • Start-request linkhttps://instabids.ai/intake?from=glossary-ridge-board&page_type=glossary&job=Review+ridge-board+dimensions%2C+rafter+connections+and+ceiling-change+options&utm_source=us&utm_medium=page&utm_campaign=glossary
Open it in your assistantAdd InstaBids as a connector

Every page is plain HTML. Steps for every assistant: add to your assistant.

What size should a ridge board be?

Match the ridge-board depth to the full cut end of the rafter. Section R802.3 in Virginia’s archived 2018 regulatory text specifies at least 1 inch nominal thickness and depth no smaller than that cut end. Clark County, Washington’s plan-review guidance also calls for full bearing across the cut rafter depth. These are jurisdiction-specific references to discuss against the code used for your project. The Virginia document is a historical rulemaking record, rather than a statement of the code currently enforced at your home. “A ridge board used to connect opposing rafters shall be not less than 1 inch (25 mm) nominal thickness and not less in depth than the cut end of the rafter.” Source: Virginia Regulatory Town Hall, read 2026-11-04. “Rafters shall be provided full bearing on the ridge board the depth of the cut rafter.” Source: Clark County, Washington, read 2026-11-04.

How do you secure rafters to a ridge board?

Request a ridge connection detail and its fastening schedule. Section R802.4.2 in Virginia’s archived 2018 regulatory text references Table R602.3(1) and allows no more than 1-1/2 inches of offset between opposing rafters at a ridge board. Ask the contractor to identify the connection arrangement and applicable fastening table in the written scope. “Rafters shall be framed not more than 1-1/2 inches (38 mm) offset from each other to a ridge board or directly opposite from each other with a collar tie, gusset plate or ridge strap in accordance with Table R602.3(1).” Source: Virginia Regulatory Town Hall, read 2026-11-04.

Is a ridge board necessary?

A ridge board is one way to join the rafters; Greene County, Missouri’s residential guide also names a gusset plate as an alternative for tying them together. For a proposal that omits the board, request a roof detail showing the specified plate connection. This local guide references the 2012 International Residential Code. “A ridge board or gusset plate is required to tie rafters together.” Source: Greene County, Missouri, read 2026-11-04.

Do I need collar ties and ceiling joists?

A ridge-board roof needs lower restraint from rafter ties or adequately attached ceiling joists. Collar ties address a different force near the ridge. The American Wood Council’s Wood Frame Construction Manual (WFCM) explanation places rafter ties in the lower third to resist thrust from roof weight and collar ties in the upper third to resist separation under uplift. “The WFCM defines a rafter tie as a structural framing member located in the lower third of the attic space that ties rafters together to resist thrust from gravity loads on the roof.” Source: American Wood Council, read 2026-11-04. “The WFCM defines a collar tie as a structural member located in the upper third of the attic space that ties rafters together to resist separation of the tops of the rafters due to uplift in a ridge board configuration.” Source: American Wood Council, read 2026-11-04. “If there are no rafter ties or ceiling joists (or if the rafter ties or ceiling joists aren’t adequately attached to the rafters), the roof framing must be constructed using a ridge beam so the rafters do not impose an outward thrust at the top of the wall.” Source: American Wood Council, read 2026-11-04.

Ridge board or ridge beam? Which one does my roof need?

The presence and attachment of the lower ties determines whether the ridge-board arrangement described by the American Wood Council applies. Without adequately attached rafter ties or ceiling joists, its guidance calls for a ridge beam. Greene County, Missouri’s guide adds a distinct scope item: the beam’s supporting structure must carry roof loads through to the foundation. Ask for that support arrangement in a ceiling-opening proposal. See the American Wood Council passage quoted above. “The ridge beam must be capable of carrying the roof loads and supported by structural elements which transmit the loads to the foundation.” Source: Greene County, Missouri, read 2026-11-04.

Sources

Related pages

Related pages

Start my requestUse your AI