In addition, at least one smoke alarm is required to be installed on each storey that does not contain a sleeping area.
No. The additional smoke alarms may be battery powered and need not be inter-connected. Additional hardwired smoke alarms would also satisfy the requirements, whether or not they are interconnected.
To determine the number of storeys in a dwelling unit, and thus determine the number of smoke alarms required, it is necessary to first identify the “first storey” of the dwelling unit.
The Fire Code defines the “first storey” as meaning the storey with its floor closest to gradeand having its ceiling more than 1.8 m above grade.
Once the first storey has been identified, it is then possible to identify the basement. The Fire Code defines a basement as meaning a storey or storeys of a buildinglocated below the firststorey. Similarly, once the first storey is identified, it is then possible to identify the second storey and, where applicable, the third storey. As illustrated below, a storey can consist of more than one level. Only one smoke alarm is required to be installed in each storey (see note 1). However, when a dwelling unit contains multiple sleeping areas, a smoke alarm must be installed to protect each separate sleeping area. This may necessitate additional smoke alarms on some levels of a split-level home (see note 2). The following illustrated example of a split-level dwelling unit is provided for clarification.
Note 1: One smoke alarm required for each of the basement, first and second storeys.
Note 2: An additional smoke alarm is required on the lower level of the second floor due to sleeping rooms.
- Fastest type to respond to flaming fires
- Lowest cost and most commonly sold
- Some models have a hush or temporary silence feature that allows silencing without removing the battery
- Some models are available with a long life battery
- Fastest type to respond to slow smouldering fires and white or grey smoke
- Less prone to nuisance alarms from cooking
Photoelectric smoke alarms may respond slightly faster to smouldering fires, while ionization alarms respond slightly faster to flaming fires. Since you can't predict the type of fire that will occur, it is difficult to recommend which is best. Both alarms will detect all types of fires that commonly occur in the home. Installing both types of smoke alarms in your home can enhance fire safety.