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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. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments
Alex
1/6/2023 08:09:56 am
In the end, I would simply call the manufacture but in my opinion, no. The smokes should be dropped. The smoke inlet to the detector varies and I'm sure if you look at the manufacture cut sheet, it says installed on flat ceiling not "in" the ceiling ha. 1/6/2023 08:11:32 am
The smoke detector(s) in question sound like residential type devices. These must be replaced due to the renovation work and by code, must be replaced at 10 years of age/service. The smoke detectors must be installed to a flat surface to allow proper smoke movement through the device. Recessing the device prevents proper flow. Refer to NFPA 72 in the residential chapter/section for additional information.
Paul Pinigis
1/6/2023 08:47:08 am
The smoke alarms (not smoke detectors by your description) must be mounted to a ceiling surface, not within a recess, because most function with smoke flowing horizontally through the device.
sean
1/6/2023 09:42:05 am
recessing is against the code, mfg installation requirements.
Mitchell
1/6/2023 09:57:30 am
NFPA 72 (2019) Leave a Reply. |
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