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Best method for cutting holes in mudwall/thickset

Best method for cutting holes in mudwall/thickset

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  #1  
Old 04-13-10, 07:55 PM
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Best method for cutting holes in mudwall/thickset

I need to install hardwired smoke alarms into a house that has walls and ceilings made of mudwall with expanded mesh backing. What is the best way to cut the holes for the round old-work boxes with minimal repair afterwards?

Thanks!
 
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  #2  
Old 04-13-10, 08:01 PM
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Trace the circle on the ceiling. Take a screwdriver and pliers and "score" in the inside of the line. The middle will break out plaster exposing the lath (wood or metal) cut the lath out with a saw, sidecutters or multitool like the fein multimaster.

*note: I have not tried the multi tool method but it would seam to be a good tool for the job. I have cut sheet metal with it and it did that very well. (although noisy)
 
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Old 04-14-10, 05:27 AM
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I used the mulit tool from Harbor Freight ($34.00) and it worked great. No chipping a and no tearing out like I used to get with a key holesaw.
 
  #4  
Old 04-14-10, 07:13 AM
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Once you score the plaster like Tolyn suggested, ive had luck with just using a holesaw. Works pretty good, though they tend to burn out fast. Put 24 old work 4" cans in a house once and blew through 5 holesaws.
 
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Old 04-14-10, 07:27 PM
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Originally Posted by ElectricJoeNJ View Post
Put 24 old work 4" cans in a house once and blew through 5 holesaws.
Wow! That had to be expensive!
 
  #6  
Old 04-14-10, 11:34 PM
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Originally Posted by Tolyn Ironhand View Post
Wow! That had to be expensive!
Indeed it was.. unforseen costs of a job
 
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