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 chimney flashing?

Chimney flashing is the metal water-shedding connection where a chimney meets the roof. DOE describes 3 parts for a brick chimney: base, step and counterflashing. With asphalt shingles, step pieces are layered into the roofing and counterflashing overlaps them; ask for those connections in the work scope.

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. Record any water stains already visible in an accessible attic near the chimney and include that observation in the inspection request. Source: Minnesota Department of Labor and Industry, hosted by Sherburne County, read 2026-11-04.
  2. Ask the written flashing scope to identify base flashing, step flashing and counterflashing separately, so the reply names all 3 components of DOE’s brick-chimney detail. Source: U.S. Department of Energy, read 2026-11-04.
  3. For historic masonry, ask the roofer to describe removal of old fastening material and reseating flashing in the mortar slots; request that joint preparation in writing. Source: National Park Service, read 2026-11-04.
  4. For a Minnesota job, request the proposed metal thickness and corrosion resistance in writing and compare the reply with the quoted R903.2.1 specification. Source: Minnesota Revisor of Statutes, read 2026-11-04.
InstaBids assistantAI · builds your written scope with you

What chimney flashing 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-chimney-flashing&page_type=glossary&job=Inspect+my+chimney+flashing+and+quote+the+repair+scope%2C+flashing+components+and+masonry-joint+preparation&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 is the difference between chimney flashing and step flashing?

Step flashing is part of the assembly; for a brick chimney with asphalt shingles, have the roofer distinguish it from the overlapping cover. “The metal flashing consists of three elements: base flashing, step flashing, and counterflashing.” Source: U.S. Department of Energy, read 2026-11-04. “A step flashing is then integrated in a layered manner with the asphalt shingle roofing.” Source: U.S. Department of Energy, read 2026-11-04. “Counterflashing is embedded into the mortar joints of the brick layer and overlaps the base flashing and the step flashing, completing the waterproofing transition.” Source: U.S. Department of Energy, read 2026-11-04.

How do I know if my chimney flashing is leaking?

Use attic staining as an inspection clue when discussing a suspected chimney leak with the roofer, following Minnesota’s asphalt-shingle guidance. “If you have inspected the roof and it looks sound, the problem could be roof flashing.” Source: Minnesota Department of Labor and Industry, hosted by Sherburne County, read 2026-11-04. “You should spend time in the attic looking for water stains, particularly around vents, chimneys and vertical wall elements above the roof.” Source: Minnesota Department of Labor and Industry, hosted by Sherburne County, read 2026-11-04.

Can chimney flashing be repaired, or does it need replacement?

Ask about a localized repair before a full reroof; the National Park Service recommendations quoted here apply to historic buildings. “Flashing can sometimes be replaced or repaired without installing a whole new roof.” Source: Minnesota Department of Labor and Industry, hosted by Sherburne County, read 2026-11-04. For historic buildings, the National Park Service advises: “Re-secure loose flashing at the dormers, chimneys or parapets.” Source: National Park Service, read 2026-11-04. For historic buildings, the National Park Service advises: “Since cap, step, valley, cricket, and apron flashings each have specific overlap and extension requirements, replacement flashing should match the existing material unless there has been a proven deficiency.” Source: National Park Service, read 2026-11-04.

What are the extra costs for chimney flashing?

For historic masonry, joint preparation is a work item to request explicitly in the estimate before comparing flashing bids. “Clean out old mortar, lead, lead wool, or fastening material and make sure that flashing is properly inserted into reglet (slot) joints, taking care not to damage the substrate.” Source: National Park Service, read 2026-11-04.

Is this chimney flashing done correctly?

For a Minnesota project, request the proposed metal thickness in the written scope under R903.2.1 before comparing flashing bids. “Where flashing is of metal, the metal shall be corrosion-resistant with a thickness of not less than 0.019 inch (0.5 mm) (No. 26 galvanized sheet).” Source: Minnesota Revisor of Statutes, read 2026-11-04.

Sources

Related pages

Related pages

Start my requestUse your AI