This instruction relates to concrete patio repair, since the methods for stone or brick patio repair are quite different. For concrete, there is generally a crack or sinking of a portion of the patio that is the basis for the repair. Here’s how to go about it.
Step 1 - Clean the Area
For cracks or holes, use a brush and dustpan to remove any large or crumbling pieces of concrete from the area. Sweep the area thoroughly, then finish the cleaning job with a high-pressure wash. This wash may be done with a garden hose and a spigot, but you could also use a pressure-washer to remove any debris.
Step 2 - Chemical Clean
Use a chemical cleaner, such as phosphoric acid, to clean and gently etch the surface of the concrete if you are going to pour a leveling layer of concrete on top. You can skip this step if you have a narrow crack and no leveling work to do.
Step 3 - Inject Epoxy Filler
Purchase a good epoxy concrete filler at a concrete supply or home improvement store. These fillers are sold in tubes that fit easily into a standard caulk gun for patio repair and other simple concrete work. Beginning at the deepest part of the crack, fill the crack thoroughly with epoxy filler, following the directions on the tube.
Be sure to allow plenty of curing time before proceeding to the next step.
Step 4 - Install Concrete Overlay
Using a surfacing concrete specifically made as a leveling topcoat, pour a thin layer over the damaged area to smooth any imperfections. If there are significant imbalances, they will require a professional to do “concrete jacking” and even the sides.