I am estimating an approach in which I'd make a rabbet on a soft concrete wall. The dimension of the rabbet are roughly ~2cm x 3cm x 400cm.

My initial idea is to find a router bit (wood router) for concrete and use that. Conceptually this sounds fairly simple, but have found close to none results when searching.

Is rabbeting concrete a plausible approach and if not what are the difficulties?

  • 2
    problem: unlike wood, there are no tools that cut concrete, concrete saws use abrasive discs that wear away the concrete. to approach the task with a router like tool would wear out lots of diamonds and make huge amounts of dust.
    – Jasen
    Jul 20 '20 at 12:41
  • 1
    This sounds more than a bit like an XY Problem. What is the purpose of the rabbet (i.e. what is the real problem you're trying to resolve), and what is a "soft concrete" wall? Is that concrete that's starting to crumble from age?
    – FreeMan
    Jul 20 '20 at 12:52
  • Also, there's a third dimension to your cut. 3cm? 30m? Please revise to describe the project better.
    – isherwood
    Jul 20 '20 at 13:04

Use a masonry saw much like a chain saw but with a large disk instead of the bar.

Then make 2 cuts 1 horizontal and one vertical.

You will need to use a rail or guide to cut straight lines.

  • Is there something essentially different between a masonry saw and a woodworking circular saw with a diamond blade? Jul 20 '20 at 11:45
  • 2
    The power comes to mind.
    – Solar Mike
    Jul 20 '20 at 11:48
  • this tool is know here as a "quick-cut saw" that may be a brand name. water is used as a lubricant which prolongs the blade life,
    – Jasen
    Jul 20 '20 at 12:34
  • Yes, a typical circular saw will have a tough time providing enough torque to keep the blade moving in poured concrete. Also, the concrete dust will destroy the bearings in short order.
    – isherwood
    Jul 20 '20 at 14:18

Use the a wall chaser, this is a tool electricians and plumbers use to cut chases (small trenches) in concrete, but fit only one blade (use a washer in place of the other(s)) do one cut from the top and one from the side.

enter image description here

  • What tool would that be, and why would it have more than one blade? This answer is confusing and incomplete.
    – isherwood
    Jul 20 '20 at 14:17
  • 1
    It's a wall chaser, very common in Germany for example where pretty much all walls are full masonry. See my answer here: diy.stackexchange.com/a/185938/65622 It has 2 blades to make 2 parallel cuts at once in order to make a chase or slot in the wall. Jul 20 '20 at 14:38
  • 2
    Sexy tool. I do not need one, but i want one. I could see that having it when you need it would be very useful.
    – Alaska Man
    Jul 20 '20 at 21:03
  • you can probably rent one
    – Jasen
    Jul 21 '20 at 6:05
  • It's like a hand-held dado stack for concrete. What's not to love!
    – FreeMan
    Jul 21 '20 at 13:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.