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Reading the Grade for a Footing

11:34
24:42
277.8K views

At 11:34 in

How to use a Rotary Laser (sponsored by Dewalt)

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What happens here

To dig a footing 12 inches below the established benchmark, you will use the grade rod and receiver. If the benchmark was 3 feet 5.5 inches, to go 12 inches deeper, the receiver reading will be 4 feet 5.5 inches (because when you go lower in elevation, the numbers on the grade rod increase). The presenter then demonstrates this by moving to a lower point in the trench and showing how the receiver indicates a higher number on the grade rod, confirming the desired depth. He emphasizes that you don't always need a specialized grade rod; a simple piece of wood with the receiver attached can be used to set a reference point at the desired depth.

Goal: Accurately measure and achieve the desired footing depth relative to the benchmark.

Tools and materials

  • DeWalt Rotary Laser DeWalt — Providing the laser line
  • Grade Rod — Measuring depth
  • Receiver DeWalt — Indicating the laser line on the grade rod
  • Tripod — Supporting the rotary laser

What they say

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doing using this as a demonstration of how to read numbers but what I'm doing is I got my transit set on the top of our very first block laser we have to go over this rotary laser not laser rotary laser I'm gonna find where she beeps she's gonna be right about here and what you see me doing is looking directly do that just don't if you care about your vision let's see you got your green goggles up yes if you do that look directly under your rotary laser just use your green googles all right so we are right now at three foot five and a half on our on our stick now we want to go we want to get the bottom of our footing down 12 inches below that so the numbers will actually go up we're going lower so as you go lower the stick goes down your numbers go up so let's go over here the bottom of this block should

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