How to Use a Concrete Grinder to Smooth Out Rough Basement Concrete

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  • 3-4 hours
  • Intermediate
  • 75-350
What You'll Need
Concrete grinder
Grinding pad
Adjustable wrench

One important factor to consider when remodeling your basement is the use of a concrete grinder. Because you'll be working with a concrete floor that will often need to be leveled or smoothed, you'll need to know how to do so by with a concrete grinder. To add this ability to your repertoire, you'll need to know how to use a concrete grinder, and what materials and tools to use.

Step 1 - Choose a Proper Grinding Pad

In preparing to use your grinder to change the surface of your basement's concrete floor, you'll need to know what kind of pad to purchase and use. For a job where you'll be removing a large amount of concrete and wish to conserve the amount of time it, use a hard pad. If you wish to polish the concrete surface, use a soft pad.

Step 2 - Set Up the Grinder

With an adjustable wrench, remove the grinder's nut that secures the pad to the rotating grinder plate. Fit the eye of the pad over the bolt from which you removed the securing nut. Then reattach the nut and tighten it with the wrench. If you wish to do heavy duty grinding and collect the dust created by the grinder, attach the grinder hose to a vacuum cleaner and turn on the vacuum cleaner. Locate the selection wheel on the grinder and set it to the "grinding" mode.

WARNING: Put on safety glasses and gloves before you start operating the grinder. If you're worried about dust getting out of the grinder hose (especially if you have respiratory issues), then wear a face mask as well.

Step 3 - Use the Grinding Mode

Begin grinding your concrete floor at one edge of the floor. Turn the grinder switch to the "on" position and wait until the grinder motor has reached its maximum RPM's. Place the grinder pad on the floor you plan to grind. As the grinder begins wearing away the concrete, keep a tight grip on it. Apply slight downward pressure and move it from side to side. Doing so will give you a more even surface and prevent the grinder from digging grooves or low spots into the surface.

Step 4 - Use the Transport Mode

Shut off the grinder and set the grinder mode selection wheel to the "transport" mode. Switch on the grinder again and begin applying the pad to the first part of the row you just finished, with the grinder pad on the yet-to-be-ground surface. It should slightly overlap the finished surface by about 2 inches. When you've finished this row, begin another. Use the same procedure for the remainder of the floor.

Step 5 - Finish

When you've finished the entire floor, use a broom to sweep up all the dust and residue from the grinding. Examine the floor to be sure you've finished the entire floor without leaving any high spots.