RenoAtlas

Chimney removal: structure, roof, floors and safety

Plan chimney removal top-to-bottom: current use, support, penetrations, fire separation, floor openings and durable roof repair.

Important: this tool helps decide what to verify; it does not replace calculations, permits or professional design where required.

VERT / GREEN

Identify whether any appliance, vent or service still uses the chimney.

JAUNE / YELLOW

Removing only the roof portion leaves mass/support and openings that must remain stable and weather-tight.

ROUGE / RED

Unknown chimney support/load role, connected appliance, hazardous materials or structural floor/roof repair: professional plan and permit review.

Indicative triage

Useful tools and data

What the professional checks

Official sources

Sources checked / sources vérifiées: 2026-08-22

Related path

Continue with the right tools

These links connect this page to the next useful checks and decisions without repeating the full content.

Plan a complete construction projectConnect feasibility, design, permits, concealed work, commissioning and closeout.Open →Check permit triggersPrepare the questions and documents to confirm with the local authority.Open →Check a contractorDocument licence, insurance, scope, payments, changes and warranties.Open →Update a construction costEscalate a historical cost using comparable index values.Open →Prepare pre-delivery reviewRecord documents, enclosure, systems, finishes and deficiencies before closeout.Open →

Tools related to this issue

V14

Systems to check before closing the work

V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesLoad-bearing walls and openingsRoof penetrations and flashingCode versions
V15

Remaining system checks not to miss

V15 covers issues that can block a project, cause a loss or become expensive once concealed.

Before closing wallsFireplace, stove and chimneyPost-renovation commissioningCodes + climate by province
V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Roof snow and iceJobsite safety and silicaCuring, drying and acclimation
V17

Specialized systems to cross-check

V17 completes gas, soil, water, fire, climate and structural interfaces.

Seismic retrofitWildfire and embers
V18

Specialized diagnostics to verify

V18 connects systems that become costly or regulated when a primary project triggers them.

Low-slope roofRoof deck over living space
V19

Edge systems to integrate into the project

V19 covers interfaces that become important when multiple home systems interact.

Skylight/tubular daylightingGreen roofSIP/ICF
V26

Often-overlooked service interfaces

V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.

Electrical service, mast and meter
V27

Project risks and overlooked interfaces

V27 connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.

Gutters, downspouts and roof drainageTile, stone and substrate deflectionTemporary weather protection during renovation
V28

Finish and service details to verify

V28 connects small details that become costly once finishes are closed.

Slate or clay tile roofing
V30

Shared, access and specialized interfaces

V30 connects projects where multiple systems, owners or rules meet.

Solar PV: roof attachment, structure and flashing
V32

Post-disaster and legacy systems

V32 connects contamination, storm damage, legacy materials and recommissioning before rebuilding.

Hail: roof and envelope impact assessment
V33

Invisible constraints before work

V33 checks electrical, legal, environmental and climate constraints that can block a project before demolition starts.

Migratory-bird nests and renovation work
V47

V47 interfaces not to miss

These details are small on a drawing but can control water, structure or durability.

Roof-wall kickoutChimney crown/capRoof-edge drip