Overcuts – Saw Jockey Concrete Cutting – Salt Lake City, Utah

overcuts in concrete

“To overcut or not to overcut: that is the question.” — Shakespeare (kind of)

Any time a new opening in a concrete surface is planned, the issue of overcuts comes up. Overcuts are the result of using a round blade to get through a flat surface that has substantial thickness. In order for the round blade to get to the boundary of the desired opening on the back/bottom side of the concrete surface, the saw needs to go past the desired opening on the front/top side of the surface. This creates a “tick-tac-toe” look to the cut on the front/top surface. The thicker the wall, or deeper the slab, the longer the overcuts need to be. The general rule of thumb is that an overcut will be the thickness of the wall/slab being cut + 2″.

There are a few ways to complete a project without overcuts (a.k.a. “square cut corners” or “zero overcut corners”). First, additional tools can be used (such as a concrete chainsaw or a ring saw). These are especially helpful for openings in walls. Another option is double cutting. This involves making two sets of cuts for the opening. The first cut is the desired perimeter of the opening with no overcuts. The second cut is inside the outer cut and has overcuts. Once the second cut is completed, the middle section is removed and the remaining outer section is chipped out. A third option is core drilling the corners of the opening and then sawing the rest of the opening. Each of these options increase the cost of the project.

Here is a photo of a blade half in a slab and half out.  The outlined part is the area of a cut (if it were in a slab) that would be missed if we didn’t overcut the top part of the slab.

Overcut Example

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 (1)

  1. I always wondered why overcuts were necessary. It makes sense though that using a circular blade would produce overcuts while cutting a thick piece of concrete. It seems like avoiding this can be tricky and requires additional resources and costs more. Does is take significantly more time to get square cut corners? Thanks for the info!

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