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dec 29

can you pour concrete over painted concrete

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

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