• When mounting the alarm on the wall, use an inside wall with the top edge of
the alarm at a minimum of 10 cm (4”) and a maximum of 30.5 cm (10”) below
the ceiling. (see Figure 1).
• In homes that are not well insulated, extreme heat or cold can be transferred
from the outside to the inside through poorly insulated walls and roof. This may
create a thermal barrier which can prevent the smoke from reaching an alarm
mounted on the ceiling. If you are not sure about the insulation in your home,
or if you notice that the outer walls and ceiling are either hot or cold, install the
alarm on an inside wall. In such homes, install the smoke alarm with the top
edge of the alarm at a minimum of 4” (10 cm) and a maximum of 12” (30.5
cm) below the ceiling (see figure 1).
• Put smoke alarms at both ends of a bedroom hallway or large room if the
hallway or room is more than 9.1 m (30 feet) long.
• Install Smoke Alarms on sloped, peaked or cathedral ceilings at or within 0.9 m
(3 ft) of the highest point (measured horizontally). Smoke alarms in rooms with
ceiling slopes greater than .3 m in 2.4 m (1 foot in 8 feet) horizontally shall be
located on the high side of the room. A row of detectors shall be spaced and
located within 0.9 m (3 ft) of the peak of the ceiling measured horizontally (see
Figure 3).
• Install Smoke Alarms on tray-shaped ceilings (coffered ceilings) on the highest
portion of the ceiling or on the sloped portion of the ceiling within 12”
(305mm) vertically down from the highest point (see figure 4).
BEDROOM
BEDROOM
KITCHEN
LIVING ROOM
BEDROOM
BEDROOM
BEDROOM
BASEMENT
KITCHEN
HALL BEDROOM
LIVING
ROOM
SINGLE FLOOR PLAN
MULTIPLE
FLOOR PLAN
NOT
IN THIS
(4”)
10 cm
MINIMUM
CEILING
DEAD AIR
SPACE
SIDE
WALL
MINIMUM
(12”)
30.5 cm
MAXIMUM
BEST
HERE
NEVER
HERE
ACCEPTABLE
HERE
(4”)
10 cm
Smoke Alarms for Minimum Protection
Smoke Alarms for Additional Protection
FIGURE 2
FIGURE 3
FIGURE 1
(3’)
0.9 m
(3’)
0.9 m
(4”)
102 mm
NOT
IN THIS
AREA
ANYWHERE
IN THIS
AREA
(3’)
0.9 m
(4”)
102 mm
NOT
IN THIS
AREA
ANYWHERE
IN THIS AREA
FIGURE 4
A
A
Remove
Install
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