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Old 08-02-2018, 10:06 AM   #1
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Grille Over a Smoke Detector


Hoping for some help here... I have dropped my ceiling about 3 inches (from the original concrete ceiling) in order to fit wiring and pot lights between the new drywall and original concrete.

Mounted on the original concrete ceiling is a smoke detector and heat detector. I am thinking to cut the drywall out of my new dropped ceiling to expose the smoke detectors and to put a grille on the cutout so that smoke and heat will still be able to reach them.

Is this allowed?

I am located in Ontario.
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Old 08-02-2018, 11:31 AM   #2
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Re: Grille Over a Smoke Detector


My instinct says no. The smoke and heat will most likely need to be relocated to the new ceiling.
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Old 08-02-2018, 01:47 PM   #3
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Re: Grille Over a Smoke Detector


Thanks!

My instinct does as well... hoping somebody familiar with fire code / regulation could give a firm yes or no.
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Old 08-02-2018, 02:59 PM   #4
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Re: Grille Over a Smoke Detector


I'd say drop the detectors to the new level. Most install instructions say to not put detectors too near the junction of a wall and ceiling as this is often a dead air space with little circulation. Also with the detectors tucked in between the two ceilings the alarm sound will be muted.

Also for ease of changing batteries and testing.

Last edited by daveb1; 08-02-2018 at 03:03 PM. Reason: Second paragraph
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Old 08-02-2018, 07:50 PM   #5
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Re: Grille Over a Smoke Detector


Good point about muting the sound. From the Ontario Building Code:


The Ontario Building Code | Smoke Alarms


3.2.4.22. Smoke Alarms

(4) A smoke alarm shall be installed on or near the ceiling.

Admittedly not great clarity to help you but I doubt behind the ceiling would be effective or compliant.
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Old 08-03-2018, 07:13 AM   #6
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Re: Grille Over a Smoke Detector


Thanks guys... I agree - I can't find any specifics in the code. Technically it would still be installed on or near a ceiling... would just have a grille in front of it.
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Old 08-03-2018, 11:03 AM   #7
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Re: Grille Over a Smoke Detector


they obviously mean on the ceiling, or near the ceiling (on the wall). if you remove common sense, then on the floor upstairs would also count as "near the ceiling".
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Old 08-25-2018, 03:14 PM   #8
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Re: Grille Over a Smoke Detector


Quote:
Originally Posted by lenaitch View Post
Good point about muting the sound. From the Ontario Building Code:


The Ontario Building Code | Smoke Alarms


3.2.4.22. Smoke Alarms

(4) A smoke alarm shall be installed on or near the ceiling.

Admittedly not great clarity to help you but I doubt behind the ceiling would be effective or compliant.

He said "detector". Not sure if that's what he meant but there is a difference between a smoke detector and a smoke alarm... a detector doen't make sound.
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