can you pour concrete over painted concrete

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

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