Drilling concrete floor for draIn


  #1  
Old 01-24-24, 07:37 AM
M
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Drilling concrete floor for draIn

I'm needing a 4 inch hole in a 4 inch concrete basement floor for a drain. The concrete hole saws I found take a SDS Plus rotary hammer drill
Are those drills sized to different hole saws. Like a 4 inch takes a much larger drill than a 2 inch?
 

Last edited by marbobj; 01-24-24 at 08:16 AM.
  #2  
Old 01-24-24, 08:23 AM
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If you want a clean hole rent a concrete boring machine and it's bit. It's basically a portable drill press with water cooling and large diamond hole saws designed specifically for concrete. A half day rental is more than you will need. Unloading and setting up the machine will take 5 or 10 minutes while boring the hole will only take a few minutes.


I would only consider a rotary hammer if you want a rough hole. You can mark the hole you want on the concrete. Then drill a series of 3/8" (or whatever) size holes around the perimeter of the hole you want. Then switch to hammer mode with a chisel bit and bust out the center and then clean up the edges.
 
  #3  
Old 01-24-24, 10:32 AM
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I'll do that, Pilot. I plan on sitting the drain fixture in and pouring Quick Crete around
​​​​​​it so I can work with a rough hole.
Thanks for the help.
 
 

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