can you pour concrete over painted concrete

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

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