By the same token, if you attempt to clean the surface and the concrete just keeps breaking apart into bits of sand and gravel, replacement is your best option. Pour the resurfacing concrete over your old concrete. Once a concrete surface has been painted, resurfacing requires some time and effort. Pressure washing is the easiest option for removing paint from outdoor concrete surfaces. The trench should be deep enough to accommodate wooden forms, which should extend 1 to 2 inches above the surface of the concrete. Though concrete is well-known for its toughness, it can degrade over time, becoming marred with pits or cracks. The two ways I can think of would be to use a concrete grinding machine to chew up the surface. First, a surface more textured and solid must be applied over the painted concrete. Push the debris off the concrete surface or collect it in a bag to throw away. Place stakes around the edges of the concrete to mark the location of control joints before proceeding with the project. To achieve the smoothest repairs possible, you should fix any large pits or cracks prior to completely resurfacing the concrete. The first order of business is to remove gravel, leaves, sand, and dirt. I suggest only doing 1 cup water and 2 cups of dry cement per batch so that you can spread it all before it dries (any more and it tends to harden before you can use it). No matter how the slab looks, moisture deep in the slab can migrate to the surface over time and cause serious problems. With a bit more preparation, though, you can cover even a painted floor successfully, giving you the hard, level surface you need for any floor covering you may choose. Resurfacing means pouring a thin layer of concrete resurfacer over the top of your existing slabs to hide cracks and make it look brand new. She received a bachelor's degree in economics and management from Goucher College in Towson, Maryland. If you plan on leveling a concrete floor, you can do so with relative ease by using a leveling compound. A painted concrete floor can interfere with the leveler, however, preventing the leveler from binding successfully with the concrete. The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. Stripping all of the paint from your concrete is essential, but the job can be a little difficult because painted concrete usually has a protective finish. Don’t worry! If the concrete isn't structurally sound, pouring new concrete over it only offers a temporary fix. Roll on more paint to cover the interior. Cover the surface with plastic and allow it to dry for a full week before attempting to use surface with the new concrete. Mix Portland cement with clean water to the consistency of regular paint. Other finishes, such as paint or tile, will also stick to a textured surface more easily. Make sure that the height of the formwork is even. Another situation where replacement is better is when sections of the concrete heave or drop, showing that the slabs have moved. Clean and Prepare the Surface. It might be the answer to fixing your problem short of a new pour. You can also use these two methods together by applying a paint stripper, then removing it with a pressure washer. Installing a resin driveway over concrete provides an easy and cost effective way of enhancing the appearance of your driveway. However, you might also check into sika. Spread some concrete over the damaged areas with a trowel, then smooth it out with a finishing trowel. Concrete paints and stains help to mask surface discoloration and signs of wear and tear and they extend the life of concrete by preventing further damage. Eventually, those same problems will return, and you may need to replace the concrete anyway. It can be painted on or applied with a rag. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. Emily Beach works in the commercial construction industry in Maryland. How to Repaint Concrete Floors. Step 5 - Painting Prepared Concrete Surface. Proper prep work is key to success when layering new concrete over old. It rolls or brushes on like paint, very easy to install & creates a bond between the old & new concrete floors. A stream of water at 4,000 to 5,000 pounds per square inch is suitable, though it is important that you fan the stream to avoid damaging the concrete. The house was built in the late fifties and the slab floor has been painted at least once. All Things Concrete: How to Remove Paint from Concrete? The concrete dries out quickly and can become too thick to work. 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