We have a Type-I, non-combustible condominium building over 75-feet tall.
The existing ceiling is concrete coated with filigree, then a popcorn finish.
For the renovation (and adding lighting), a new ceiling is being dropped using a 1-1/2" steel hat track then 1/2" drywall for a total of a 2-inch drop.
Existing smoke detectors are 10-year battery, surface-mounted to the filigree ceiling. They are not linked or part of the building fire alarm system. There is one fire alarm speaker in each unit tied to the building fire alarm system.
Do the smoke detectors have to be flush with the new drywall surface, or could they be left on the filigree ceiling?
I believe the speaker can be left attached to the filigree ceiling and be in a pocket (or a void) in the new drywall ceiling with a metal speaker cover. The sound is actually amplified.
I've never heard or seen a smoke detector being installed below or even with the surface of the ceiling, though.
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