Having a smoke alarm somewhere in the house is not the same as having adequate smoke alarm coverage.
A fire can begin on another floor or behind a closed door. Proper placement helps an alarm detect smoke sooner and ensures the warning can be heard where people sleep.
The Essential Locations
The U.S. Fire Administration recommends installing smoke alarms:
- Inside every bedroom.
- Outside each separate sleeping area.
- On every level of the home, including the basement.
A home with bedrooms in two different areas needs alarms outside both sleeping areas. A finished attic or lower level used as living or sleeping space also needs appropriate protection.
Why Inside and Outside Bedrooms?
An alarm inside a bedroom can provide faster warning if a fire starts there. An alarm in the hallway or area outside bedrooms can detect smoke coming from another room and warn everyone in the sleeping area.
This combination is especially important when bedroom doors are closed. Closed doors can slow the spread of smoke and heat, as explained in our Close Before You Doze article, while alarms inside and outside the room help make sure the warning is heard.
Use Interconnected Alarms
When interconnected alarms are installed, activation of one causes all of them to sound. A basement alarm can therefore warn someone sleeping on an upper floor sooner than a single isolated alarm might.
Interconnection may be hardwired, wireless or built into a listed alarm system. Use compatible equipment and follow the manufacturer's instructions. If hardwiring or electrical work is required, use a qualified professional.
Follow Placement Instructions
Smoke rises, so alarms are generally installed on ceilings or high on walls. Exact distances from corners, walls, peaks, vents, fans and cooking appliances vary by alarm type and location. Always follow the instructions supplied with the alarm and applicable codes.
Avoid placing an ordinary smoke alarm where steam, cooking aerosols or strong airflow will routinely cause nuisance alarms or delay smoke reaching the sensor. The answer is not to disable a problem alarm. Use the correct alarm type and an approved location.
Special Alerts Are Available
People who are deaf or hard of hearing may need smoke alarms and accessories that use strobe lights, low-frequency sound or bed and pillow shakers. Build these devices into the household escape plan and make sure they activate with the rest of the alarm system.
Test and Replace Alarms
Test every smoke alarm monthly using its test button. Replace batteries and alarms according to the manufacturer's instructions. Smoke alarms do not last forever; USFA recommends replacing alarms when they are 10 years old.
Check the manufacture date printed on the alarm. If an alarm is damaged, painted over, missing, beyond its service life or does not sound properly during testing, replace it.
Review our broader smoke alarm safety guide, then include every alarm in the routine described in your home fire escape plan.
Walk Through Your Home Today
Start in each bedroom and work outward. Is there an alarm inside the room? Is there another outside the sleeping area? Is every level covered? Can everyone hear the alarms?
Correct placement, regular testing and a practiced escape plan work together. If a smoke alarm sounds, leave immediately, stay outside and call 911 from a safe location.