Fire Protection for Residential and Small Buildings (OBC Part 9)
Scope of Part 9
Part 9 covers houses, small buildings, and similar structures within its size limits. It uses simpler, prescriptive rules than Part 3, but the fire safety principles are the same: limit fire spread, provide egress, and give warning. Key topics include smoke alarms, fire separations between dwelling units, exit facilities, and protection of openings.
Residential fire safety
Smoke alarms are required in dwelling units and in common areas, with placement rules and interconnection requirements. Dwelling unit separations and garage separations protect occupants from adjacent hazards. Means of escape, window sizes for escape, and stair and corridor requirements are simplified but still mandatory.
Traps
- Assuming Part 9 buildings need no fire separations; duplexes and row houses need rated separations.
- Forgetting that smoke alarms must be interconnected and placed on each storey and near sleeping areas.
- Confusing escape windows with egress doors.
- Overlooking garage and furnace room separations.
- Applying Part 3 rules to a Part 9 building, or vice versa.
Rule of thumb
In a house, think warning, separation, escape. Worked example: a semi-detached house needs a fire separation between units, interconnected smoke alarms in each unit, and at least one compliant escape route, which may be a door or a suitably sized window. A garage attached to the house needs a separation and a self-closing door to keep fumes and fire out of the dwelling.
Exam approach
Confirm the building falls under Part 9 by size and occupancy before applying Part 9 rules; then check alarms, separations, and escape.