Core Drilling – Saw Jockey Concrete Cutting – Salt Lake City, Utah

man drilling through wall

Drilling round holes in walls (e.g., for vents of wires) or slabs (e.g., for pipes or handrails) is called “core drilling.” The drill bits are hollow in the middle and when the cut is done, in addition to a round opening, you have a nice round “core” of concrete (or brick) left. Core drill bits vary in size from 1″ to as big as you want (Saw Jockey Concrete Cutting currently has bits going up to 48″ in stock).

When scheduling core drilling service, these are some of the details to be aware of:

  • On the wall or slab to be drilled, we need this clearance:
    • 6″ in all directions around the hole to be drilled
    • 2′ (from the edge of the hole to be drilled), in one direction, in order for us to bolt the drill post to the wall.
    • 5′ of space in front of the hole to be drilled for the drill post and drill.
  • While some core drilling applications can be hand drilled, the majority require the drill to be mounted to a post, which in turn needs to be securely anchored to the surface being drilled. To anchor the post, here are the most common methods:
    • If the surface is a concrete wall, we drill a small anchor hole (2″ deep and 5/8″ in diameter) and insert the anchor (which is left in the wall). The anchor is below the surface of the wall and is able to be covered up by the owner/contractor after the project is completed.
    • If an anchor bolt is unable to be used, we can drill the 5/8″ hole all the way through the wall and sandwich the wall (using a bolt through wood or metal plates on both sides of the wall), to create an anchor point.
    • If we are drilling on a slab, we can sometimes use a vacuum base to anchor the post. The big issue here is if we can get a good seal.
  • As with all concrete cutting, water is used as a lubricant for the core drill bit. This creates “slurry” (a mixture of water and cut concrete). Depending on where the cutting is done (inside or outside, finished or unfinished spaces), we can provide as much, or as little, “water/slurry control” as desired (letting it drain into the soil outside, using a shop vac to get the majority of it off a floor, or putting plastic up all around it to have maximum protection). With more control comes more prep time and thus increases the cost of the project. Note: when using a shop vac, there will still be a residue of the concrete dust after the area dries. This should be cleaned with a dry broom (a wet mop or broom will simply spread it).
  • If drilling a hole on a roof/floor, we will need to know what is below and how/if we need to “catch” the core. We can often drill close to the bottom of the floor and break off the majority of the core before we get through.
  • When setting up a core drill, we will run both power and water lines from our truck. We will need to know how close we will be able to park our truck and how to route the hoses to the project (inside vs outside, finished vs unfinished space . . . )

Please contact Saw Jockey Concrete Cutting of Salt Lake City, Utah if you have questions about a concrete cutting or core drilling need. We are committed to giving our customers excellent quality work in a timely fashion at a reasonable price.


Comments (5)

  1. Fine way of describing, and good post to take information on the topic of
    my presentation subject, which i am going to present in college.

  2. I thought that the information about using water for core drill bits was really interesting. I’ve heard how this is also used for concrete cutting, but not for core drilling. I can see how this can be useful for more “water/slurry control” depending on what’s required for project. Thanks for posting this!

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