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Sawdust & Steel
project guide

Removing a Chimney Breast but Keeping the Stack

A chimney removal affects support, roof weathering, and possibly appliance venting. Establish the full chimney arrangement before treating the visible breast as spare space.

  • 2 min read
  • by Sawdust & Steel Workshop
Project Guide · Ontario homes · 2 minute readRead the 2 primary sources

A chimney breast can occupy exactly the corner a kitchen wants back. The masonry continues beyond the room, however, and it does not become self-supporting when the cabinetry arrives.

Establish the whole chimney arrangement

Identify what remains above and below the proposed removal, including roof-level masonry and any shared or adjoining construction. Have the structural support and the appliance-venting status checked by the appropriate professionals.

Do not assume an unused fireplace proves the whole chimney is unused. The scope should identify every connected appliance and the proposed treatment of abandoned routes.

PEO's engineering-service guidance provides the authorization check for the structural professional. Ask for a design of the remaining condition, not only permission to remove the visible portion.

Include the roof and finishes

If the stack is reduced or removed, the roof opening and flashing need a coordinated repair. IKO's flashing guide discusses assessing existing junctions and their condition. The weather detail deserves its own line in the scope, rather than being left as patch roof.

Ask for the final condition in writing

  • What masonry remains and how is it supported?
  • Which flues are active, abandoned, or being altered?
  • Who handles structural, venting, and roof work?
  • What inspections, approvals, and neighbouring-property considerations apply?

Keep demolition paused until those answers agree. A chimney is not just an awkward cupboard-shaped object. We would compare the entire removal project against the value of the space it actually returns.