Repairing Large Cracks In Concrete Porch

A shop vacuum is also helpful for completely removing dirt dust and loose debris.

Repairing large cracks in concrete porch.

The first part of repairing the cement slab is to seal any cracks to prevent them from spreading up into the new layer of concrete that you will use to level the surface. You will need a tube of vinyl concrete patching material a wet rag a soft bristle brush and a wire brush. This last option works best to fill large cracks or chipped edges while the other products are suitable for cracks in concrete that are inch wide or narrower. How to repair wide concrete cracks.

Using a chisel make the crack wider at the bottom than the top. The secret to fixing wide concrete cracks is to undercut the sides of the crack to give it an inverted v shape. Concrete cracks cannot be patched with concrete since concrete contains aggregate rock pieces that are too large to fit in cracks. This helps the repair material to key into the crack creating a mechanical bond in addition to the chemical bond between the patch material and the concrete.

Instead for cracks up to 1 2 inch wide and 1 4 inch deep you should use a polymer based sanded acrylic latex filler that you inject into the crack with a caulking gun and smooth over with a putty knife. Fill the crack with patching mix also know as vinyl concrete step 4. Prepare the cracked. Cracks in a concrete porch less than three eights of an inch wide can be easily repaired.

Clean out the debris with a stiff fiber or wire brush.