Smoke Alarm minimum dBA

[gtownspark]

Can anyone tell me what the minimum dBA should be for a domestic smoke alarm system at the bed head?

 

[Guest 004]

85 (eighty five)

 

[gtownspark]

Thank you, I have measured 97.1

 

[tlangdon12]

It would be really useful when replying to such a question to provide a reference to the answer so that the questioners can be certain of the authority of the answer.

 

[Richard Burns]

BS5839 as summarised by ttsfire.co.uk states:
Alarm Sound Levels

It is essential that, whenever any of the smoke alarms in the dwelling detects a fire, the sound level of the alarm (from either that smoke alarm or other smoke alarms interconnected with it) is sufficient to wake up at least the adult members of the household. The sound level in any bedroom is likely to be satisfactory if there is a smoke alarm in the bedroom, interconnected to all other smoke alarms in the dwelling. However, if this is not the case, the nearest interconnected smoke alarm to the bedroom, capable of sounding an alarm whenever fire is detected anywhere in the dwelling, should not be further than 3 m from the bedroom door.
In some dwellings, such as flats, maisonettes and houses in multiple occupation, doors to rooms may be fire doors, which tend to attenuate the sound from smoke alarms more than normal, domestic doors. In these cases, great care should be taken to ensure that the sound level in bedrooms is sufficient. In some houses in multiple occupation, the local authority may demand that the sound level at the bedheads in some or all bedrooms is 75dB(A) when the bedroom doors are closed. This should be determined before finalising the number of smoke alarms required, because 75dB(A) is unlikely to be produced at the bedhead unless there is a smoke alarm within the bedroom.
If occupants suffer from severe hearing impairment, BS 5839 : Part 6 recommends that special alarm devices, such as high intensity beacons and vibrating pillow or mattress pads, be provided.

 

[oxocube]

And 65db elsewhere.