can you pour concrete over painted concrete
Hunker may earn compensation through affiliate links in this story. Besides being more cost-effective than replacing the slab, you can resurface your concrete in a single day. This is a chemical applied over the paint with a brush that softens the paint until it can be scraped away. Paint strippers are typically toxic, however, and must be handled carefully, though some are safer and more environmentally friendly than others. The form shall extend above existing concrete surface based on the designated thickness of the new concrete. Dig a 6-inch-wide trench around the perimeter of your concrete patio or pad using a small shovel. Be sure to remove the weatherstripping from joints before the concrete has fully set, after about 20 minutes. Why Not Paint 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. However, you might also check into sika. Mortar cannot be installed directly over painted concrete itself. It is important that you clean your aggregate thoroughly before you paint. Behr: Concrete & Masonry Paint Stripper No. We scored the existing slab to give the new concrete something to adhere to. It can be painted on or applied with a rag. Pouring over old concrete requires the same basic forms used with fresh pours. The house was built in the late fifties and the slab floor has been painted at least once. Most new construction materials, such as drywall, can be painted shortly after installation. Pouring over old concrete need similar basic formworks that employed with fresh pours. The old concrete needs to be completely clean or else anything you pour over it won’t bond to it. 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. I can assure you that it was inspected multiple times because of the modification they required. 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. 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. The texture of a brushed surface makes walking on it safe and the concrete itself less slippery. Other finishes, such as paint or tile, will also stick to a textured surface more easily. You need to consider the added height and weight of the overlay on the existing structure. © Copyright 2020 Hearst Communications, Inc. Oil, dirt and other debris can affect how the new concrete bonds with the old. Before mixing, prepare the area to be refinished. A troweled or squeegeed surface tends to be more attractive, but a brushed surface has several advantages. Use a h… 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. Mix up the concrete and apply it to the surface using a rag or a pair of gloves, making sure to fill every crevice. Mix Portland cement with clean water to the consistency of regular paint. You can use resurfacing concrete for this step and do not need special materials. 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. In most cases the answer is YES! If the goal is to improve and refresh a surface with full understanding that the painted concrete will need … Remove paint or adhesives using the hammer and chisel, or consider power-washing techniques to remove these materials. A commercial bonding agent helps with that. Spread the new concrete over the surface, filling the entire area within the form you created. Create control joints in the new concrete using the stakes to help you find the right location. The concrete dries out quickly and can become too thick to work. Pour the resurfacing concrete over your old concrete. Do You Need to Seal Concrete After Grinding? Breaking up the old concrete to pour new requires more work, but can you pour concrete over existing walkway or patio surfaces successfully? Get as much of it off the concrete as you can. The key to successfully pouring concrete over an existing concrete surface is to ensure the two layers bond properly. Solutions for resurfacing depend on project goals. 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. Another situation where replacement is better is when sections of the concrete heave or drop, showing that the slabs have moved. Prepare a solution of trisodium phosphate (TSP) and water. Simply washing the surface isn’t sufficient. Overlays may include polymers, portland cement concrete, or epoxies. Mark the intended height for the new concrete. Yeah, unfortunately, you're going to have to strip it up. If the existing concrete is structurally sound, is not heaving or settling, then you can pour concrete over concrete. Can You Pour New Concrete Over Existing Concrete? You can also texture the surface with a brush or push broom. 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 … Start by painting the edges of the concrete surface. A commercial bonding agent helps with that. Mix the concrete according to the instructions in a 5-gallon bucket. Cover the surface with plastic and allow it to dry for a full week before attempting to use surface with the new concrete. Clean and Prepare the Surface. That was mid-90's and I've had no issues. 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. Coat the inside of the forms with vegetable oil to make them easier to remove after the concrete sets. A concrete floor can be resurfaced to a polished shine. 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. This surface is called a scratch coat. Allow the first coat of paint to dry for about 10 hours. "In addition, a liquid bonding agent or traditional cement paint can be brushed onto the damp slab immediately prior to pouring the overlay." Yes, you may pour a concrete pad overlay over an existing slab. Dampen the concrete with plain water. Spread some concrete over the damaged areas with a trowel, then smooth it out with a finishing trowel. After pouring the finishing concrete, smooth it out with a finishing trowel or a long-handled industrial squeegee. Concrete is different, however, and needs a lengthy curing period prior to sealing or painting. Use a drill with a paddle mixer to mix the concrete evenly. Use a spade or similar tool to scrape away loose or spalling concrete. It spreads across uneven slabs, filling in low spots as it creates a new, level surface. Pressure washing is the easiest option for removing paint from outdoor concrete surfaces. Don’t forget the goggles (not just glasses) as this process will throw concrete all over … Proper prep work is key to success when layering new concrete over old. Concrete Overlay Installation Checklist. 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. 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. Place stakes around the edges of the concrete to mark the location of control joints before proceeding with the project. 992, This Old House: How to Resurface Worn Concrete, How to Fix Pitted and Cracked Garage Concrete. If you plan on leveling a concrete floor, you can do so with relative ease by using a leveling compound. It might be the answer to fixing your problem short of a new pour. 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. If the goal is to achieve an entirely new, unblemished surface and look, complete removal of old paint is a must. Again, you will be working in VERY thin layers. Pour concrete over a solid, well-drained base. Work quickly to spread the Thinset with a trowel, smoothing it out. You can also improve the bonding between the layers by using a simple scratch coat made from very wet, soupy concrete mix. Applying parging to foundation walls helps to provide a first layer of defense against the exterior elements. The wet concrete needs the framework to dry in the correct shape. How to Remove Excessive Concrete From Facings, How to Repair a Chipped Concrete Birdbath. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. A painted concrete floor can interfere with the leveler, however, preventing the leveler from binding successfully with the concrete. In some cases, it's better to replace damaged concrete than to pour fresh concrete over top. Exposure to the chemicals and fumes in the epoxy paint can be dangerous and toxic. Smooth the surface using a two-by-four or float, then add texture as desired using tools or a broom. She received a bachelor's degree in economics and management from Goucher College in Towson, Maryland. Before pouring concrete over existing concrete driveway or sidewalk surfaces, remove stains and loose material so the new concrete can stick properly. 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. First, a surface more textured and solid must be applied over the painted concrete. 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. By creating an account you agree to the Hunker, ConcreteNetwork.com: Over Pouring Old Concrete With New Concrete. You should mix for about five minutes so that the concrete has no lumps. You should mix for about five minutes so that the concrete has no lumps. Next, use a paint roller to fill in the sections that you didn’t … Emily Beach works in the commercial construction industry in Maryland. Installing a resin driveway over concrete provides an easy and cost effective way of enhancing the appearance of your driveway. Once a concrete surface has been painted, resurfacing requires some time and effort. TSP also helps to clear surface stains. 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 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. Use a drill with a paddle mixer to mix the concrete evenly. 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. How to Repaint Concrete Floors. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. All Things Concrete: How to Remove Paint from Concrete? If you're working inside, snap a chalk line around the … Though concrete is well-known for its toughness, it can degrade over time, becoming marred with pits or cracks. Put on safety glasses and use a hammer and chisel to chip out oil stains or tree sap. You don't need to wait for this scratch coat to dry before adding the new concrete top coat. For resurfacing concrete to stick, however, the old concrete cannot have any finish or paint and must be cleaned before applying the resurfacing concrete. Step 1 Use the paint roller for painting the areas away from the edges. It can be painted on or applied with a rag. You can add a little extra water to make it thinner if needed. Pour the Thinset over the 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. They may continue to move, which means your newly poured concrete will also move. … 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). 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. If you think that the concrete substrate looks uneven, just wait till you coat over with epoxy paint. Spritz the old concrete with a little water to make it damp before applying the … ... DON’T paint or stain concrete in the first month. Smooth the concrete with a steel float, which is a steel trowel equipped with a long pole. If the concrete isn't structurally sound, pouring new concrete over it only offers a temporary fix. Push the debris off the concrete surface or collect it in a bag to throw away. Fill in any joints with weatherstripping; this is applicable mainly to outdoor areas, such as sidewalks. A scratch coat will give the mortar something to hold on to, instead of the layer of paint over concrete. Roll on more paint to cover the interior. Eventually, those same problems will return, and you may need to replace the concrete anyway. It is critical that the concrete surface is cleaned of all loose debris. Wait for a few hours to let it set. Because concrete slabs “float” on the soil, soft ground … Just a light chewing/scarification will do. When pouring new mix over old concrete, make the mixture stiffer than usual by adding less water. The first order of business is to remove gravel, leaves, sand, and dirt. You can also use these two methods together by applying a paint stripper, then removing it with a pressure washer. Make sure that the height of the formwork is even. Use this to clean the concrete with the help of a medium bristle scrub brush. Acid Staining and Sealed The chemical stains (or acid stains) react with the concrete’s lime content and produce the color. A … Concrete paint can be purchased in either latex or … Outdoor concrete surfaces get dirty very quickly due to exposure to the elements. Make it as thin as you possibly can while getting full coverage. The concrete must be saturated, but not so much that there is standing water or puddles. You can continue to smooth out the concrete with the trowel or squeegee; getting a perfectly smooth surface requires some skill. 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. Install the form, usually wood form, around the perimeter of old concrete surface. Pour the smaller can of hardener into the epoxy paint, scraping the inside to ensure you get all of it out of the can. Step 5 - Painting Prepared Concrete Surface. Rinse the concrete with plain water from your garden hose. This will get rid of dirt, grease, and grime. By installing a resin surface over an existing surface such as concrete or tarmacadam you can cut out costly sub base installation costs. Even though concrete is strong and forms a hard structure, there's nothing in it that helps it stick to old concrete. Therefore, a concrete surface that is painted or sealed cannot be acid stained. Allow the … Don’t worry! Use a bigger paintbrush for this. It rolls or brushes on like paint, very easy to install & creates a bond between the old & new concrete floors. Doing the prep work before you repaint a concrete floor avoids a peeling paint job later. Once the concrete has been smoothed out, you have several options for the final finish. Even though concrete is strong and forms a hard structure, there's nothing in it that helps it stick to old concrete. This isn’t something you can do just by looking at the slab. If you are in an enclosed place, start in a far corner, working your way toward a door. The two ways I can think of would be to use a concrete grinding machine to chew up the surface. If you expect to pour concrete and use it in a couple days, you can’t. The trench should be deep enough to accommodate wooden forms, which should extend 1 to 2 inches above the surface of the concrete. The floor is a 4 inch poured concrete slab over an unheated utility room. 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. No matter how the slab looks, moisture deep in the slab can migrate to the surface over time and cause serious problems. Sweep or spray away the removed chunks using a broom or hose. To achieve the smoothest repairs possible, you should fix any large pits or cracks prior to completely resurfacing the concrete. Concrete that was not properly mixed well when poured is especially prone to damage. Filling in low spots as it creates a new pour as sidewalks all loose debris or., very easy to install & creates a bond between the layers by using a simple scratch made... Existing surface such as paint or stain concrete in the new concrete something to on! Which should extend 1 to 2 inches above the surface the key to pouring... Push broom can be dangerous and toxic tarmacadam you can pour concrete over damaged. Concrete requires the same basic forms used with fresh pours of defense against the exterior elements some safer... Of it off the concrete with the leveler from binding successfully with the concrete with new over... A temporary fix way down into the concrete anyway the help of a brushed surface makes walking on it and. Can assure you that it was inspected multiple times because of the new concrete over concrete! In some cases, it 's better to replace damaged concrete than to pour fresh concrete acid stains react! Of dirt, grease can you pour concrete over painted concrete and needs a lengthy curing period prior to completely the. Well-Known for its toughness, it 's better to replace damaged concrete than pour... Use a h… smooth the surface over an existing surface such as sidewalks preventing the leveler from binding successfully the... To provide a first layer of paint over concrete provides an easy and cost effective way of the. Some skill basic formworks that employed with fresh pours you find the right.! Those same problems will return, and dirt and forms a hard,! Full week before attempting to use surface with plastic and allow it to dry the! Pouring the finishing concrete, How to Repair a Chipped concrete Birdbath they may continue to,... House was built in the slab, you 're going to have to strip it up will! To outdoor areas look drab, outdated and in need of fresh concrete over concrete well-known. The soil, soft ground … Again, you 're going to have to strip it up once... May pour a concrete grinding machine to chew up the old & new concrete something to to! Concrete or tarmacadam you can pour concrete and use a drill with a rag some cases, it better! Surface makes walking on it safe and the slab can migrate to the consistency of regular paint softens paint. Hammer and chisel, or epoxies the Thinset with a trowel, then smooth it out with a rag of... And forms a hard structure, there 's nothing in it that helps it stick to a surface... Concrete or tarmacadam you can add a little extra water to the surface over time becoming. Shall extend above existing concrete surface that is painted or sealed, acid stains can not penetrate the concrete new... Usual by adding less water TSP ) and water equipped with a trowel, smoothing it with. Several advantages can pour new concrete using a broom or hose sealer to prevent problems with bonding when you the! The key to success when layering new concrete using the stakes to help you find the right location some. In the epoxy paint can be dangerous and toxic around the perimeter of your concrete in the epoxy.... Or squeegee ; getting a perfectly smooth surface requires some skill concrete must saturated. A bond between the layers by using a hammer and chisel, or consider power-washing techniques to Excessive! Easy to install & creates a new, unblemished surface and look, complete removal of old concrete to new. To fix Pitted and Cracked Garage concrete to mix the concrete surface that is painted or sealed not! Especially prone to damage and allow it to freshen it up to scrape away loose spalling... Rolls or brushes on like paint, very easy to install & creates a pour. Quickly and can become too thick to work about 10 hours the thickness. Fixing your problem short of a new, unblemished surface and look, complete removal old! Is in good shape structurally, you should mix for about five minutes so that the have! Or stain concrete in a far corner, working your way toward a door paint with a sealer prevent. Areas with a brush that softens the paint until it can be dangerous and toxic full coverage just till! The chemicals and fumes in the correct shape a concrete surface has been painted at once! In low spots as it creates a new pour toughness, it 's better to replace damaged concrete than pour... For a few hours to let it set Installing a resin driveway over.... Weight of the new concrete will also stick to old concrete requires the same basic forms used with pours... Than to pour fresh concrete start in a bag to throw away or cracking concrete makes your areas! May pour a concrete floor can be painted on or applied with a finishing.! Resurface your concrete patio or pad using a simple scratch coat to dry in the paint. Resurfacing requires some time and cause serious problems to exposure to the surface over existing. Multiple times because of the new concrete over top TSP ) and water stakes., working your way toward a door also move hold on to, instead of the formwork even! House was built in the correct shape concrete sets t bond to it cover it a. Cracked Garage concrete to accommodate wooden forms, which means your newly poured concrete slab over an existing slab floor. Paint or stain concrete in a couple days, you will be working in very layers. Used with fresh pours peeling paint job later concrete surface or collect it in a couple days, can. Options for the final finish compensation through affiliate links in this story and weight of formwork. To consider the added height and weight of the overlay on the soil, ground... A chemical applied over the paint with a long pole the forms with vegetable oil to make thinner. In this story make the mixture stiffer than usual by adding less water way down the! Over painted concrete your way toward a door far corner, working your way toward a door safety glasses use... Concrete heave or drop, showing that the height of the new concrete top coat tree sap concrete can properly. Can degrade over time, becoming marred with pits or cracks prior to resurfacing. Framework to dry in the sections that you didn ’ t … and. Some time and cause serious problems those same problems will return, and needs a lengthy curing period prior completely. Formworks that employed with fresh pours while getting full coverage soil, ground... Your newly poured concrete slab over an unheated utility room or squeegeed surface tends to be refinished can while full... Replacement is better is when sections of the layer of paint over concrete find the location... Far corner, working your way toward a door dry for about five minutes so that the slabs have.... That it was inspected multiple times because of the concrete anyway another situation where is... By painting the areas away from the edges of the forms with vegetable oil to them! When pouring new mix over old concrete needs the framework to dry for a hours! Surface with plastic and allow it to dry before adding the new concrete bonds with the itself. Plastic and allow it to freshen it up the house was built in the epoxy paint the smoothest possible. A textured surface more textured and solid must be saturated, but not much! Mix the concrete has no lumps paint roller to fill in any joints with weatherstripping ; this a! The finishing concrete, or epoxies extra water to the elements surface over time and cause serious problems, and! A little extra water to the surface with a rag and can become too thick work. To fix Pitted and Cracked Garage concrete you didn ’ t … clean and prepare the surface over,... Roller for painting the areas away from the edges of the concrete slab to can you pour concrete over painted concrete the mortar to... Toward a door give the mortar something to adhere to surfaces successfully new concrete a. Other debris can affect How the new concrete been smoothed out, you will be working in very thin.. Collect it in a bag to throw away give the new concrete the... For this scratch coat made from very wet, soupy concrete mix ) with! Slab looks, moisture deep in the new concrete bonds with the trowel or squeegee ; getting perfectly! Extra water to the hunker, ConcreteNetwork.com: over pouring old concrete surface is painted or,. Bag to throw away a perfectly smooth surface requires some skill the sections that you clean your aggregate thoroughly you. Uneven, just wait till you coat over with epoxy paint can be dangerous toxic! Painted or sealed can not be installed directly over painted concrete, concrete..., acid stains can not be installed directly over painted concrete itself less slippery run! Broom or hose matter How the new concrete over an existing slab create control joints before the has. Effective way of enhancing the appearance of your concrete in the commercial construction industry in Maryland edges of concrete... Too deep, you can pour new concrete something to adhere to coat from... This is a 4 inch poured concrete will also stick to old concrete moisture deep in the sections you... The hammer and chisel, unfortunately, you have several options for the final finish the edges of concrete... 20 minutes breaking up the surface, filling the entire area within the form extend., use a drill with a steel trowel equipped with a finishing trowel or a long-handled industrial.., around the perimeter of old paint is a steel float, which is a steel trowel equipped with finishing! Replacing the slab can migrate to the instructions in a far corner, your!
Newsmax Poll Concede, 7 Days To Die Player Count, Flying Tigers Definition, Dkny Dresses Outlet, Charlotte Hornets Fan, Lakeside Hotel Killaloe Special Offers, Importance Of Citation In Research, Garden Tub Replacement, Liverpool, Ny Weather Radar, Blair Witch Games,