Clean Out Debris and Loose Chunks

What happens in this clip

Begin by thoroughly cleaning out the chipped area of the concrete. Use a chisel, or a screwdriver, to break out any loose chunks of concrete. Once loose chunks are removed, use a wire brush to loosen and remove any remaining debris and dirt that has built up over time. Getting the surface of the chipped out area clean is the most important part of this project, as it ensures the new patch can firmly and securely adhere to the old concrete.

Goal: Remove debris and loose concrete chunks from the chipped area

What's used

Tools

• Chisel
• Screwdriver
• Wire Brush

About the full video

This project provides step-by-step instructions on how to repair a missing chunk from a concrete surface, such as a driveway, sidewalk, or patio slab. The process involves thoroughly cleaning the chipped area, mixing and applying a concrete-vinyl patching compound, and then finishing the patch for a seamless repair. Additional steps for larger or heaved areas are also mentioned.

Step 2 of 6: Undercut the Edge (if necessary)

If the chip has sharp, feather-edged concrete, use a chisel and hammer to slightly undercut the edges of the damaged area. This creates a small 'keyway' or 'dovetail' shape that helps to lock the repair material in place. Aim for an undercut of about 1/4 inch deep. Brush away any dust created by this process.

Open this step in the guide

Every video in How to Repair a Chipped Concrete Step Edge

1. Step 1: Clean the Chipped Area

   • 0:12–0:55 Clean and Prepare the Damaged Area
   • 0:46–1:13 Clean Out Debris and Loose Chunks
   • 1:36–3:50 Clean Out Loose Concrete and Debris

2. Step 2: Undercut the Edge (if necessary)

   • 0:46–1:13 Clean Out Debris and Loose Chunks (this video)
   • 1:36–3:50 Clean Out Loose Concrete and Debris
   • 0:43–1:02 Prepare Damaged Concrete and Install Forms

3. Step 3: Mix the Concrete Repair Compound

   • 0:39–0:49 Mix Patching Cement
   • 1:41–1:54 Mix Concrete Patching Compound
   • 1:03–2:18 Mix the Concrete Patcher

4. Step 4: Apply the Repair Compound

   • 1:55–2:11 Apply Concrete Patch to Chips
   • 1:15–4:04 Apply Two-Part Epoxy Filler
   • 1:32–1:46 Fill Damaged Areas

5. Step 5: Shape and Finish the Surface

   • 3:40–5:58 Smooth and Finish Concrete Step Repair
   • 0:52–1:02 Smooth and Finish Concrete Patch
   • 3:15–5:02 Shape and Texture the Patch

6. Step 6: Cure the Repair

   • 0:37–0:46 Cure and Protect the Repaired Area
   • 0:28–0:29 Allow Compound to Cure
   • 11:58–12:06 Cure and Protect Repaired Steps