Smoke detector, NM old work box, hole saw

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Old 01-22-08, 08:54 PM
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Smoke detector, NM old work box, hole saw

Hey guys

Just joined the DIY site. Cool forum.

Question. What size hole saw(s) could i purchase to install round old work boxes (NM/Blue) for smoke detectors?

Thanks
Mike
 
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Old 01-23-08, 09:48 AM
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It's usually stamped on the box itself, and it might vary a little bit between manufacturers. I usually just trace around the box with a pencil and freehand cut about 1/4" (the width of the box lip) inside the line with a keyhole saw or rotozip.
 
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Old 01-23-08, 07:11 PM
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Hey
Thanks for the reply. Thats what i usually do for drywall.
But this is that lat-board. So keyhole saw is no good ( for round holes anyway IMO). The bit for the rotozip burns up too quick even when going slowly. Plus the wall is so brittle!
I was just wondering if there was a general all around size
(3 7/8, 4 or 4 1/8)?

Thanks
Mike
 
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Old 01-23-08, 07:33 PM
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I use a 4 1/4" hole bit, and it works perfectly, especially allowing for the ears on the old work boxes.
 
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Old 01-26-08, 06:12 PM
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Thank you sir...
 
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