Sprinklers in Lieu of Smoke Detectors

Q: We are seeking to reduce activation of smoke heads contained in our construction areas. In your opinion, if the construction area has existing sprinkler coverage or if new active sprinklers are installed in the construction area, would it be acceptable to remove the smoke heads in this space? In other words, are sprinklers a proper substitute for smoke heads?

A: No… sprinklers are never an acceptable substitute for smoke detectors, because sprinklers do not sense the presence of smoke. Conversely, smoke detectors are never an acceptable substitute for sprinklers because they do not extinguish a fire. However, if the smoke detectors are not required by code or regulation, then they can be removed without any alternative life safety measures applied.

According to 4.6.10.1 of the 2012 Life Safety Code, only deficiencies of required features of life safety necessitate alternative life safety measures (ALSM), also known as Interim Life Safety Measures (ILSM). However, be aware that not all surveyors will likely understand this and they may cite an organization for impaired smoke detectors even if the smoke detectors are not a required feature of life safety.

It is not uncommon for designers to over-install smoke detectors and place them in areas where they are not required. But if the smoke detectors are required, and you desire to remove them for construction purposes (not a bad idea) then you will have to assess them for ALSM and likely implement a fire watch, which can be very costly since it is now required to have a continuous fire watch. Replacing the smoke heads with heat detectors still does not change the result. If the smoke detectors are required then a heat detector is not an acceptable substitute.