Most new construction materials, such as drywall, can be painted shortly after installation. This will get rid of dirt, grease, and grime. Don’t forget the goggles (not just glasses) as this process will throw concrete all over … Concrete is different, however, and needs a lengthy curing period prior to sealing or painting. If you're working inside, snap a chalk line around the … Concrete Overlay Installation Checklist. If the stains do not run too deep, you can chip away the concrete using a hammer and chisel. You should be able to rent a machine that will do it from your local tool "we-rent-it" type of place... or they would … After pouring the finishing concrete, smooth it out with a finishing trowel or a long-handled industrial squeegee. This is a chemical applied over the paint with a brush that softens the paint until it can be scraped away. Start by painting the edges of the concrete surface. It can be painted on or applied with a rag. If the moisture level deep in the slab is too high, you need to take steps to remediate it before you can pour your new concrete floor. A painted concrete floor can interfere with the leveler, however, preventing the leveler from binding successfully with the concrete. The texture of a brushed surface makes walking on it safe and the concrete itself less slippery. Another situation where replacement is better is when sections of the concrete heave or drop, showing that the slabs have moved. "In addition, a liquid bonding agent or traditional cement paint can be brushed onto the damp slab immediately prior to pouring the overlay." 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. Yes, you may pour a concrete pad overlay over an existing slab. 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). Mix enough water to a small amount of resurfacing concrete so you can spread it easily with a trowel, about 1 part resurfacing concrete to 7 parts water. 992, This Old House: How to Resurface Worn Concrete, How to Fix Pitted and Cracked Garage Concrete. Mix up the concrete and apply it to the surface using a rag or a pair of gloves, making sure to fill every crevice. A commercial bonding agent helps with that. How to Remove Excessive Concrete From Facings, How to Repair a Chipped Concrete Birdbath. Just a light chewing/scarification will do. In some cases, it's better to replace damaged concrete than to pour fresh concrete over top. Create control joints in the new concrete using the stakes to help you find the right location. You can add a little extra water to make it thinner if needed. Overlays may include polymers, portland cement concrete, or epoxies. Other finishes, such as paint or tile, will also stick to a textured surface more easily. Step 5 - Painting Prepared Concrete Surface. A scratch coat will give the mortar something to hold on to, instead of the layer of paint over concrete. Concrete paint can be purchased in either latex or … The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. Next, use a paint roller to fill in the sections that you didn’t … You can also improve the bonding between the layers by using a simple scratch coat made from very wet, soupy concrete mix. Once a concrete surface has been painted, resurfacing requires some time and effort. Step 1 ... DON’T paint or stain concrete in the first month. Oil, dirt and other debris can affect how the new concrete bonds with the old. Prepare a solution of trisodium phosphate (TSP) and water. Wait for a few hours to let it set. TSP also helps to clear surface stains. For resurfacing concrete to stick, however, the old concrete cannot have any finish or paint and must be cleaned before applying the resurfacing concrete. Clean and Prepare the Surface. Roll on more paint to cover the interior. Place stakes around the edges of the concrete to mark the location of control joints before proceeding with the project. Behr: Concrete & Masonry Paint Stripper No. If you plan on leveling a concrete floor, you can do so with relative ease by using a leveling compound. If the concrete has multiple deep cracks extending all the way through its depth, pouring concrete over existing sidewalk, driveway or patio surfaces generally is a waste of time. Use a drill with a paddle mixer to mix the concrete evenly. The first order of business is to remove gravel, leaves, sand, and dirt. 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. It is critical that the concrete surface is cleaned of all loose debris. Work quickly to spread the Thinset with a trowel, smoothing it out. Dampen the concrete with plain water. Because concrete slabs “float” on the soil, soft ground … Mix the concrete according to the instructions in a 5-gallon bucket. Solutions for resurfacing depend on project goals. However, you might also check into sika. Pouring over old concrete need similar basic formworks that employed with fresh pours. Get as much of it off the concrete as you can. Use a h… Emily Beach works in the commercial construction industry in Maryland. Before mixing, prepare the area to be refinished. You don't need to wait for this scratch coat to dry before adding the new concrete top coat. If you expect to pour concrete and use it in a couple days, you can’t. © Copyright 2020 Hearst Communications, Inc. Yes, parging will break down over time because concrete does not have an unlimited lifespan, but a properly applied parge coat will last for a very long time. A commercial bonding agent helps with that. Comment: When we pour concrete floors over existing concrete floors and the new floor is less than 3 inches thick, we use a product called Weld Crete to bond the two floors together. Proper prep work is key to success when layering new concrete over old. Remove all crumbling concrete and dust; Overlay stones no larger than 1/3 thickness of the overlay; Use secret cement paint to bond overlay to the old concrete Once the concrete has been smoothed out, you have several options for the final finish. Make sure that the height of the formwork is even. Mortar cannot be installed directly over painted concrete itself. The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. Use a spade or similar tool to scrape away loose or spalling concrete. Coat the inside of the forms with vegetable oil to make them easier to remove after the concrete sets. Fortunately, you have options for making a concrete surface look new again, and one of these options is applying resurfacing concrete over the old concrete. You should mix for about five minutes so that the concrete has no lumps. Can You Pour New Concrete Over Existing Concrete? Put on safety glasses and use a hammer and chisel to chip out oil stains or tree sap. By creating an account you agree to the Hunker, ConcreteNetwork.com: Over Pouring Old Concrete With New Concrete. Hunker may earn compensation through affiliate links in this story. You can also texture the surface with a brush or push broom. Cover the surface with plastic and allow it to dry for a full week before attempting to use surface with the new concrete. You can also use these two methods together by applying a paint stripper, then removing it with a pressure washer. Pour the Thinset over the concrete. Worn or cracking concrete makes your outdoor areas look drab, outdated and in need of fresh concrete. No matter how the slab looks, moisture deep in the slab can migrate to the surface over time and cause serious problems. If the concrete isn't structurally sound, pouring new concrete over it only offers a temporary fix. The trench should be deep enough to accommodate wooden forms, which should extend 1 to 2 inches above the surface of the concrete. Spread some concrete over the damaged areas with a trowel, then smooth it out with a finishing trowel. Spritz the old concrete with a little water to make it damp before applying the … Use this to clean the concrete with the help of a medium bristle scrub brush. Besides being more cost-effective than replacing the slab, you can resurface your concrete in a single day. Before pouring concrete over existing concrete driveway or sidewalk surfaces, remove stains and loose material so the new concrete can stick properly. Allow the … If the stain covers a large area, cover it with a sealer to prevent problems with bonding when you pour the new concrete. … 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 old concrete needs to be completely clean or else anything you pour over it won’t bond to it. You can use resurfacing concrete for this step and do not need special materials. First, a surface more textured and solid must be applied over the painted concrete. Mix Portland cement with clean water to the consistency of regular paint. In most cases the answer is YES! I can assure you that it was inspected multiple times because of the modification they required. Use a bigger paintbrush for this. There are several options for stripping paint indoors, but the method that minimizes labor and requires no major equipment is using a concrete paint stripper. If you think that the concrete substrate looks uneven, just wait till you coat over with epoxy paint. She received her LEED accreditation from the U.S. Green Building Council in 2008 and is in the process of working towards an Architectural Hardware Consultant certification from the Door and Hardware Institute. If the goal is to improve and refresh a surface with full understanding that the painted concrete will need … Use the paint roller for painting the areas away from the edges. The form shall extend above existing concrete surface based on the designated thickness of the new concrete. If the concrete surface is painted or sealed, acid stains cannot penetrate the concrete and react with the lime. 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