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Mortar cannot be installed directly over painted concrete itself. A commercial bonding agent helps with that. 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. If you plan on leveling a concrete floor, you can do so with relative ease by using a leveling compound. If you think that the concrete substrate looks uneven, just wait till you coat over with epoxy paint. Use a drill with a paddle mixer to mix the concrete evenly. Just a light chewing/scarification will do. All Things Concrete: How to Remove Paint from Concrete? She received a bachelor's degree in economics and management from Goucher College in Towson, Maryland. Pouring over old concrete requires the same basic forms used with fresh pours. This is a chemical applied over the paint with a brush that softens the paint until it can be scraped away. Exposure to the chemicals and fumes in the epoxy paint can be dangerous and toxic. Spritz the old concrete with a little water to make it damp before applying the … Even though concrete is strong and forms a hard structure, there's nothing in it that helps it stick to old concrete. Concrete is different, however, and needs a lengthy curing period prior to sealing or painting. Prepare a solution of trisodium phosphate (TSP) and water. Even though concrete is strong and forms a hard structure, there's nothing in it that helps it stick to old concrete. Concrete paint can be purchased in either latex or … This isn’t something you can do just by looking at the slab. By creating an account you agree to the Hunker, ConcreteNetwork.com: Over Pouring Old Concrete With New Concrete. Acid Staining and Sealed The chemical stains (or acid stains) react with the concrete’s lime content and produce the color. Pour concrete over a solid, well-drained base. Applying parging to foundation walls helps to provide a first layer of defense against the exterior elements. As you go, you can scrape the thicker parts back to the container, and add small amounts of water, about a tsp at a time. Concrete Overlay Installation Checklist. They may continue to move, which means your newly poured concrete will also move. Start by painting the edges of the concrete surface. … 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. A commercial bonding agent helps with that. You can continue to smooth out the concrete with the trowel or squeegee; getting a perfectly smooth surface requires some skill. The form shall extend above existing concrete surface based on the designated thickness of the new concrete. The trench should be deep enough to accommodate wooden forms, which should extend 1 to 2 inches above the surface of the concrete. It spreads across uneven slabs, filling in low spots as it creates a new, level surface. Again, you will be working in VERY thin layers. You can also improve the bonding between the layers by using a simple scratch coat made from very wet, soupy concrete mix. It can be painted on or applied with a rag. TSP also helps to clear surface stains. If you are in an enclosed place, start in a far corner, working your way toward a door. Use the paint roller for painting the areas away from the edges. Fill in any joints with weatherstripping; this is applicable mainly to outdoor areas, such as sidewalks. 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). Clean and Prepare the Surface. Sweep or spray away the removed chunks using a broom or hose. You can also use these two methods together by applying a paint stripper, then removing it with a pressure washer. Besides being more cost-effective than replacing the slab, you can resurface your concrete in a single day. A … Work quickly to spread the Thinset with a trowel, smoothing it out. Mix the concrete according to the instructions in a 5-gallon bucket. For resurfacing concrete to stick, however, the old concrete cannot have any finish or paint and must be cleaned before applying the resurfacing concrete. This surface is called a scratch coat. Breaking up the old concrete to pour new requires more work, but can you pour concrete over existing walkway or patio surfaces successfully? Eventually, those same problems will return, and you may need to replace the concrete anyway. Use a drill with a paddle mixer to mix the concrete evenly. If the stain covers a large area, cover it with a sealer to prevent problems with bonding when you pour the new concrete. It might be the answer to fixing your problem short of a new pour. Rinse the concrete with plain water from your garden hose. Cover the surface with plastic and allow it to dry for a full week before attempting to use surface with the new concrete. Worn or cracking concrete makes your outdoor areas look drab, outdated and in need of fresh concrete. Outdoor concrete surfaces get dirty very quickly due to exposure to the elements. Emily Beach works in the commercial construction industry in Maryland. Why Not Paint Concrete? Coat the inside of the forms with vegetable oil to make them easier to remove after the concrete sets. Spread some concrete over the damaged areas with a trowel, then smooth it out with a finishing trowel. Roll on more paint to cover the interior. Can You Pour New Concrete Over Existing Concrete? Use this to clean the concrete with the help of a medium bristle scrub brush. No matter how the slab looks, moisture deep in the slab can migrate to the surface over time and cause serious problems. Remove paint or adhesives using the hammer and chisel, or consider power-washing techniques to remove these materials. Dampen the concrete with plain water. Use a bigger paintbrush for this. You should mix for about five minutes so that the concrete has no lumps. A concrete floor can be resurfaced to a polished shine. Allow the … Step 1 Be sure to remove the weatherstripping from joints before the concrete has fully set, after about 20 minutes. Make it as thin as you possibly can while getting full coverage. Before mixing, prepare the area to be refinished. Another situation where replacement is better is when sections of the concrete heave or drop, showing that the slabs have moved. Pour the smaller can of hardener into the epoxy paint, scraping the inside to ensure you get all of it out of the can. If you're working inside, snap a chalk line around the … Pour the resurfacing concrete over your old concrete. You should mix for about five minutes so that the concrete has no lumps. Get as much of it off the concrete as you can. How to Remove Excessive Concrete From Facings, How to Repair a Chipped Concrete Birdbath. It can be painted on or applied with a rag. Pouring over old concrete need similar basic formworks that employed with fresh pours. Yeah, unfortunately, you're going to have to strip it up. If the stains do not run too deep, you can chip away the concrete using a hammer and chisel. You need to consider the added height and weight of the overlay on the existing structure. © Copyright 2020 Hearst Communications, Inc. By installing a resin surface over an existing surface such as concrete or tarmacadam you can cut out costly sub base installation costs. Use a spade or similar tool to scrape away loose or spalling concrete. We scored the existing slab to give the new concrete something to adhere to. If the concrete surface is painted or sealed, acid stains cannot penetrate the concrete and react with the lime. You can also texture the surface with a brush or push broom. Spread the new concrete over the surface, filling the entire area within the form you created. This will get rid of dirt, grease, and grime. Installing a resin driveway over concrete provides an easy and cost effective way of enhancing the appearance of your driveway. Do You Need to Seal Concrete After Grinding? My rule of thumb is this: If the new concrete is 3 inches thick or more - you don't have to bond the new concrete to the old concrete. Place stakes around the edges of the concrete to mark the location of control joints before proceeding with the project. The old concrete needs to be completely clean or else anything you pour over it won’t bond to it. Pour the Thinset over the concrete. When pouring new mix over old concrete, make the mixture stiffer than usual by adding less water. Doing the prep work before you repaint a concrete floor avoids a peeling paint job later. The first order of business is to remove gravel, leaves, sand, and dirt. A scratch coat will give the mortar something to hold on to, instead of the layer of paint over concrete. Behr: Concrete & Masonry Paint Stripper No. 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. The concrete dries out quickly and can become too thick to work. If the existing concrete is structurally sound, is not heaving or settling, then you can pour concrete over concrete. It is important that you clean your aggregate thoroughly before you paint. Allow the first coat of paint to dry for about 10 hours. Put on safety glasses and use a hammer and chisel to chip out oil stains or tree sap. Wait for a few hours to let it set. To achieve the smoothest repairs possible, you should fix any large pits or cracks prior to completely resurfacing the concrete. Simply washing the surface isn’t sufficient. The floor is a 4 inch poured concrete slab over an unheated utility room. Don’t forget the goggles (not just glasses) as this process will throw concrete all over … Make sure that the height of the formwork is even. Mark the intended height for the new concrete. You can use resurfacing concrete for this step and do not need special materials. The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. The two ways I can think of would be to use a concrete grinding machine to chew up the surface. Smooth the concrete with a steel float, which is a steel trowel equipped with a long pole. Before pouring concrete over existing concrete driveway or sidewalk surfaces, remove stains and loose material so the new concrete can stick properly. Don’t worry! Oil, dirt and other debris can affect how the new concrete bonds with the old. Paint strippers are typically toxic, however, and must be handled carefully, though some are safer and more environmentally friendly than others. Install the form, usually wood form, around the perimeter of old concrete surface. Next, use a paint roller to fill in the sections that you didn’t … That was mid-90's and I've had no issues. 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 Most new construction materials, such as drywall, can be painted shortly after installation. A fresh coat of paint or stain can really spruce up concrete basement or garage walls and floors and bring new life to a worn concrete patio. A troweled or squeegeed surface tends to be more attractive, but a brushed surface has several advantages. Proper prep work is key to success when layering new concrete over old. Because concrete slabs “float” on the soil, soft ground … If the concrete isn't structurally sound, pouring new concrete over it only offers a temporary fix. Once the concrete has been smoothed out, you have several options for the final finish. 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. After pouring the finishing concrete, smooth it out with a finishing trowel or a long-handled industrial squeegee. 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 be able to rent a machine that will do it from your local tool "we-rent-it" type of place... or they would … 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. How to Repaint Concrete Floors. If the goal is to achieve an entirely new, unblemished surface and look, complete removal of old paint is a must. Though concrete is well-known for its toughness, it can degrade over time, becoming marred with pits or cracks. Use a h… 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. 992, This Old House: How to Resurface Worn Concrete, How to Fix Pitted and Cracked Garage Concrete. Pressure washing is the easiest option for removing paint from outdoor concrete surfaces. The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. Therefore, a concrete surface that is painted or sealed cannot be acid stained. The wet concrete needs the framework to dry in the correct shape. If the goal is to improve and refresh a surface with full understanding that the painted concrete will need … It is critical that the concrete surface is cleaned of all loose debris. The texture of a brushed surface makes walking on it safe and the concrete itself less slippery. A painted concrete floor can interfere with the leveler, however, preventing the leveler from binding successfully with the concrete. It rolls or brushes on like paint, very easy to install & creates a bond between the old & new concrete floors. Yes, you may pour a concrete pad overlay over an existing slab. Create control joints in the new concrete using the stakes to help you find the right location. Mix Portland cement with clean water to the consistency of regular paint. Overlays may include polymers, portland cement concrete, or epoxies. If you expect to pour concrete and use it in a couple days, you can’t. The house was built in the late fifties and the slab floor has been painted at least once. Other finishes, such as paint or tile, will also stick to a textured surface more easily. You don't need to wait for this scratch coat to dry before adding the new concrete top coat. 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. The concrete must be saturated, but not so much that there is standing water or puddles. You can add a little extra water to make it thinner if needed. Concrete that was not properly mixed well when poured is especially prone to damage. Step 5 - Painting Prepared Concrete Surface. In most cases the answer is YES! Once a concrete surface has been painted, resurfacing requires some time and effort. 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. ... DON’T paint or stain concrete in the first month. Mix up the concrete and apply it to the surface using a rag or a pair of gloves, making sure to fill every crevice. However, you might also check into sika. Solutions for resurfacing depend on project goals. Dig a 6-inch-wide trench around the perimeter of your concrete patio or pad using a small shovel. "In addition, a liquid bonding agent or traditional cement paint can be brushed onto the damp slab immediately prior to pouring the overlay." 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. 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. Hunker may earn compensation through affiliate links in this story. 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. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. The back of the Ardex Feather Finish said to use a 1 part water to 2 parts dry cement ratio when mixing smaller amounts, and I used a disposable plastic cup to mix this ratio in my paper bucket. Smooth the surface using a two-by-four or float, then add texture as desired using tools or a broom. In some cases, it's better to replace damaged concrete than to pour fresh concrete over top. 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. Push the debris off the concrete surface or collect it in a bag to throw away. I can assure you that it was inspected multiple times because of the modification they required. 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