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Best method for cutting holes in mudwall/thickset


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04-13-10, 07:55 PM   #1  
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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04-13-10, 08:01 PM   #2  
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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04-14-10, 05:27 AM   #3  
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.

 
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04-14-10, 07:13 AM   #4  
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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04-14-10, 07:27 PM   #5  
Posted By: ElectricJoeNJ Put 24 old work 4" cans in a house once and blew through 5 holesaws.
Wow! That had to be expensive!


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04-14-10, 11:34 PM   #6  
Posted By: Tolyn Ironhand Wow! That had to be expensive!
Indeed it was.. unforseen costs of a job

 
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