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• 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).
• Put smoke alarms at both ends of a bedroom hallway or large room if the hall-
way 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).
MOBILE HOME INSTALLATION
Modern caravans and mobile homes have been designed and built to be energy
efficient. Install smoke alarms as recommended above (see Figures 1 and 2).
In older caravans and mobile homes that are not well insulated compared to pres-
ent standards, 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. In
such units, install the smoke alarm on an inside wall with the top edge of the
alarm at a minimum of 10 cm (4”) and a maximum of 30.5 cm (12”) below the
ceiling (see Figure 1).
If you are not sure about the insulation in your caravan or mobile home, or if you
notice that the outer walls and ceiling are either hot or cold, install the alarm on an
inside wall. For minimum protection, install at least one alarm close to the bed-
rooms. For additional protection, see SINGLE FLOOR PLAN in Figure 2.
BEDROOM
BEDROOM KITCHEN
LIVING ROOM
BEDROOM
BEDROOM
BEDROOM
BASEMENT
KITCHEN
HALLBEDROOM
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
●
SmokeAlarmsforMinimumProtection
●●
SmokeAlarmsforAdditional
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
(102 mm)
4"
NOT
IN THIS
AREA
ANYWHERE
IN THIS AREA