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Explaining and Demonstrating Control Joint Application

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How the Pro's Pour Concrete with Victory Outdoor Services #3

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What happens here

One of the key steps in concrete finishing is creating control joints to prevent random cracking. A worker demonstrates the use of a walking jointer. This tool is designed to cut grooves into the wet concrete at predetermined intervals. The process begins by snapping a line onto the concrete surface using a nylon string line, which acts as a guide for the jointer. The walking jointer, equipped with long poles, is then carefully pushed along this line to create the initial groove. The demonstrator emphasizes that achieving perfectly straight lines requires skill and practice.

Goal: Understand and learn the technique for creating control joints with a walking jointer.

Tools and materials

  • Nylon String Line — Snapping guide lines on the concrete surface
  • Poles — Extending the reach of the walking jointer
  • Walking Jointer — Creating grooves (control joints) in the concrete
  • Wet Concrete — The material being worked on

What they say

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he's better than you already sarge so what are we doing ryan so we're gonna put the joints in the control joints this is a walking jointer it's connected to poles you can add more poles to a certain extent obviously you can put about five on maximum to reach out but there's a point where you just can't get it anymore but this is putting that groove in there like the control joints we talked about before so i walk them in with this walking jointer and then when the concrete sets up a little bit more the guys will actually use hand joiners they'll go out on knee boards and they'll clean them up all perfectly so this is the initial cutting of the control joints this takes a lot of skill to get these straight because your control joints they need to be pretty straight no control joints going to be like a laser but they got to be straight by eye right because this is something you're going to look at forever and that's it so what i'm doing here is we snap the line with a nylon string line to leave an impression on the surface of the concrete now what i do is i'll slowly push this jointer out and i'll watch the jointer and i'll try to keep it right on that line and you will never get it perfect the first time out but you push it all the way out there and then you look at it which i'll show you in just a second so we'll stop there just for this little demonstration so now i'll look down the joint and you'll see all the little imperfections the little you know waves back and forth so as i drag it back i'll very carefully angle that jointer one way or the other to get those little wobbles out as you bring it back to get that joint as straight as possible so i'll drag it back and i'll just eyeball it and i'll try to get all those little wobbles out as i bring it back concrete's a little wet for this right now and the handles are in the trees but we'll do the best we can here and you'll do this sometimes it takes three or four times to get it perfect but that's how you get straight joints if you look down that now i'll go another time or two but that's pretty straight already so once i hit that one or two more times it'll be pretty much perfect it's almost like he did this once or twice before yeah i think i've yeah i've cut probably many many miles of joints in my life i'm going to let this set up for a few minutes it's a little wet i'm going to get it give it five more minutes i'll let you try it because it is actually it's pretty difficult

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