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 Worn or cracking concrete makes your outdoor areas look drab, outdated and in need of fresh concrete.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