Kai Mallari's Notes'

CO Alarms Are Required Wherever Fuel-Burning Appliances or a Garage Are Present (Home Systems)

4 min read

CO Alarms Are Required Wherever Fuel-Burning Appliances or a Garage Are Present

idea decision-rule

Claim: BC Building Code Article 9.32 requires a CO alarm near sleeping areas and on every storey with a fuel-burning appliance — and triggers on four conditions that many strata residents don’t realize apply to them even without their own furnace.

Mechanism

CO is produced by incomplete combustion of any carbon-based fuel: natural gas, propane, oil, wood, or gasoline. It is colourless, odourless, and tasteless — without an alarm, there is no warning. At 200 ppm, CO causes headache within 2–3 hours; at 1,600 ppm, death within 1 hour.

The four triggers under BC Building Code 9.32 — a CO alarm is required in any dwelling unit that:

  1. Contains a fuel-burning appliance — furnace, boiler, gas water heater, gas fireplace, gas range, gas dryer, wood stove, or any other combustion appliance inside the unit.
  2. Has an attached garage — even one car idling for 2 minutes can push CO through shared walls or doorways to lethal concentrations in adjacent living space.
  3. Shares a wall or floor with a service room containing a fuel-burning appliance — the building’s furnace or boiler room can exhaust CO into adjacent units through penetrations.
  4. Shares a wall or floor with a parkade — vehicle exhaust contains CO; underground parkades adjacent to residential units are a recognized source.

Strata implication: a unit on the second floor with no fuel-burning appliances of its own still requires CO alarms if the parkade or mechanical room is below it or adjacent — which is common in multi-storey strata buildings.1

Placement rule: CO alarms must be placed near sleeping areas (outside each sleeping room, or inside each sleeping room if the sleeping room has an attached bathroom with a fuel-burning appliance) and on every storey with a fuel-burning appliance.12

CO alarms do not need hardwired power under the BC Building Code — battery-powered CO alarms are code-compliant. However, if a combination smoke+CO unit is used in a location requiring a hardwired smoke alarm, the entire unit must be hardwired.1

CO sources in the home to know:

  • Gas furnaces, boilers, and water heaters — especially when back-drafting due to blocked venting or negative air pressure
  • Gas fireplaces (incomplete combustion or venting failure)
  • Attached garages — idling or warming up vehicles
  • Gas ranges and ovens (normal use produces small amounts; blocked venting produces more)
  • Portable generators or propane heaters used indoors (should never be used indoors; mentioned as common emergency-scenario source)

Scope

This rule covers in-unit CO alarm placement. Building-wide CO detection in parkades and mechanical rooms is part of the strata building’s fire protection system and is the strata corporation’s responsibility.

All-electric units in a strata building may still require CO alarms if trigger condition 3 or 4 applies (shared wall/floor with fuel-burning mechanical room or parkade). Verify your specific building layout before concluding “no CO alarm needed.”

CO alarm end-of-life is 7–10 years — shorter than the 10-year smoke alarm standard. Plan replacement at year 7 for CO units.

Idea Compass

North: Where this comes from

East: Tensions / failure

  • All-electric unit occupants who assume they have no CO risk — the parkade and mechanical-room adjacency triggers still apply
  • CO alarms are commonly skipped by owners who do their own battery-alarm upgrades and only think to install smoke alarms

South: Where this leads

  • smoke-co-detectors (Home Systems) — the parent component note with testing procedures and cost table
  • A CO alarm near every sleeping area is the action item — verify placement today

West: What’s similar

Sources

Footnotes

  1. BC Building Code 2018, Division B, Article 9.32 (Carbon Monoxide Alarms) — CO alarm required in any suite with a fuel-burning appliance, adjacent to a garage, or sharing a wall/floor with a room containing fuel-burning equipment — https://free.bcpublications.ca/civix/document/id/public/bcbc2018/bcbc_2018dbp9s910r2 ↩ ↩2 ↩3 ↩4

  2. ProAmp Electric, Metro Vancouver electrician — BC code summary: CO alarms outside every sleeping area and on every floor with a fuel-burning appliance; CO sensor lifespan 7–10 years — https://proampelectric.ca/smoke-detector-requirements-bc/ ↩

Graph View

Backlinks