The objective of proper preparation is for the existing concrete not to be a "base," but to "combine" or "be part of" the new. Can I skim the concrete with cement to level the concrete. The top of the new concrete would have to be a max of about 5-6 inches above existing concrete, butted against wood sheathing. How to Pour Concrete Over-Existing Concrete Slab? Gerber Ortiz-Vega is a Masonry Specialist and the Founder of GO Masonry LLC, a masonry company based in Northern Virginia. Disadvantages of Concrete pouring is a crucial process which not only needs properly qualified persons but also considerable focus and concentrations. The most important is how the old porch looks. If you have to level a sloped site or bring in a lot of fill, hire an excavator for a day to help prepare the site. It may be better to "slabjack" the slab level (inject a product under the slab that will float it level) than to add a thin layer to the top that is prone to adhesion issues. If commercial cleaners and TSP don’t work, you may need to get muriatic acid. I am a building contractor with 25+ years. I did not expect to find the exact answer easily. Lean concrete pouring. Consult a professional to determine what needs to be done. You can usually mix and pour a small batch without setting up a perimeter. Is the old floor badly cracked or otherwise damaged? the concrete in the ground anchors the post evenly. Masonry Specialist & Founder, GO Masonry LLC. The string should be the same distance from the board at all times. existing walkway, patio or porch will raise the level by several inches. Fine sand or crushed stone is preferred for small thickness concrete and coarse aggregate is used for concrete of higher thickness. eliminate a trip hazard and keep debris from collecting in the corner. last month. ", we wanted, so we needed to figure out how to fix it. As everything in the world, concrete also has a lifespan and it wears out over time. Put your excess concrete in a contractor grade trash bag and then dispose of it. It is a dirt floor with 4" concrete. Larger aggregates cannot be used to make thin coats, so make sure you get the type of concrete mix best suited for your project. This article has been viewed 530,486 times. Check the product’s label to make sure. To protect the new-laid concrete from wearing out soon, a protective layer is applied by using curing compound and sprayed it all over the surface which usually takes seven days to cure. No matter how strong a slab of concrete seems, it will wear out over time. This can work well when priming small areas. I don't think we have 1" to spare. The condition of the existing slab is the primary factor that determines how long the new concrete will last. Make sure the stakes are planted firmly in the dirt so the braces don’t fall as you work. If the slab underneath continues to move, the upper layer also eventually will move. If the I love the cement paint idea. Less is usually more with the scratch coat. It must be ensured that the braces are evenly spread which is can be done by running a bubble or string. If you're done using your tools, clean everything off with water and a wire brush. If your concrete garage floor has seen better days, you can apply a concrete overlay to give it a new lease on life. If you don’t own a pressure washer, check home improvement stores in your area. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. If the foundation beneath the slab is not sound, the new concrete could sink or develop deep potholes. © 2009-2020 The Constructor. We are going to be pouring a new concrete walkway next to an existing asphalt driveway. Concrete is generally a mixture of cement, sand, gravel, and water. The existing driveway is pretty standard. How can I remove/excavate existing concrete? 1. Take your time measuring. How do I know if I should go with an extension or a brand new porch? What is the maximum thickness I can add on top of an existing pad? Try mixing about 1  fl oz (30 mL) per .125  fl oz (3.7 mL) of water. By signing up you are agreeing to receive emails according to our privacy policy. It is often included as part of the patching mix. You could, but it would be better to find out why your slab is not level and correct the underlying problem, lest your shed tilt in the future. When needing to pour a concrete slab durring a period of social distancing you sometimes have no choice but to do it yourself. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Sweeping dirt’s debris over the existing concrete slab will allow bonding to take place. Follow the manufacturer’s instructions to mix the TSP powder with water into a paste. If this isn’t possible, you can work on concrete during warm days, but be quick so the concrete doesn’t have a chance to dry out. several inches can throw off its alignment with the driveway, steps or another The concrete has cracked about 1.5 " deep along one wall in the corner and along a portion of the wall. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab’s lifespan. ", concrete and did a nice thing. It sounds like the existing porch had an unstable footing for the soil movement (freeze/thaw) and/or was attached to a home with a lot of movement. ... Pouring new concrete next to old. In addition, decorative concrete can be used to create aesthetically pleasing finished surfaces for driveways, patios and pathways. Difference between Flexible Concrete and Normal Concrete. Almost all codes have established certain specifications to ensure proper concrete pouring and prevent its segregation. Imperfections forms when the concrete hardens or sinks into the ground. For the thick concrete slab, a wire-mesh is needed on the braces to provide strength. Thanks. Adding fresh concrete is a common way to level out old slabs and patch damage. Always get more concrete than you need to ensure you have enough. How to Choose Water Pumps for Construction Sites. The standard mixture is 1:7 of water to cement. How do I form an outside corner to add new cement to the old? The foundation … Remove the sheet to moisten the concrete again every day for a week. Mix and pour the concrete according to the package instructions, and spread the concrete with a trowel before spraying it with a curing compound. Wish us luck. In this article, correct concrete pouring according to ACI 304R-00 is presented. ", "It helps me to supervise my job at home.". Hope it turns out okay. Oil and sap must be removed before new concrete can be poured. The ground beneath the existing concrete may not be level, so measure on all sides. Adding a slight ramp from the driveway to the raised surface helps wikiHow marks an article as reader-approved once it receives enough positive feedback. Thank you. Tying into an existing concrete driveway involves digging, spec-ing, sloping, pouring, and brooming. Alternatively, get the wood cut at a home improvement store. I was removing the sod and dirt and noticed that the edge of the asphalt is slightly beveled. ", "Just knowing that it is possible helps. Use a stiff-bristled broom to knock as much debris out of cracks as possible. Concrete is a mixture of water and cement. Gerber specializes in providing brick and stone laying services, concrete installations, and masonry repairs. Include your email address to get a message when this question is answered. Fine concrete looks smooth or has very small stones. Expert Interview. Become VIP Member, Do you need to remove the ads? To lay new concrete, sweep and clean the old concrete, and saturate the old concrete with water. You can if the concrete is sound (solid) with minor cracks, pitting, scaling, surface damage, or just plain ugly. If you are pouring 4 have them break it 5 high. the concrete around the post at the top (slab or patio) will cause two problems, 1 it makes a weak spot that will crack or 2 as the cocrete expands and contracts with the weather it could shear the post and cause the structure to fail. You can always cut out old concrete and replace it. Please enter your email address. Video Transcript: Hi. The thickness of the slab is designed. If new concrete binds to the existing slab, cracks are inevitable. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Masonry Specialist & Founder, GO Masonry LLC. slab runs up to a door, the raised surface may not provide the necessary There are are two things we need to discuss under concrete pouring. If 1 end is closer to the string than another end, the brace isn’t straight and should be adjusted. A slab poured over an existing slab is more vulnerable to frost heave damage and cracks. Some contractors use vegetable oil or other lubricants on the lumber for easier removal from the final concrete product. Gerber Ortiz-Vega. Just nail it with roofing tacks enough to hold it until the concrete is poured. However, proper prep work is needed. With that in mind, this method is intended for cosmetic purposes ONLY. It shows what you are really getting into before you jump on a project. The house was built about 1970. Using an edging tool can help you spread the concrete around corners. ", "A lot of neat ideas that will make the job easier, keep up the good work guys! Basic techniques need to consider and methods of concrete pouring should be considered. Imperfections form when concrete hardens or sinks into the ground. If it isn't level or easy to work with, you may need to redo it before you can expand it. Patch damages as soon as they develop to prevent them from spreading, and seal the new layer with a deep penetrating sealer to prevent water damage. 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. This would anchor the new pour to the wood post and not just to the old cement. A. The maximum thickness isn't an issue, but the minimum is. If your concrete is badly cracked, it may not be salvageable. The old concrete needs to be completely clean or else anything you pour over it won’t bond to it. ", "Many questions and answers combined make for great information! Depending upon the requirement of the preferred use of the slab and the loads coming upon the slab. It gives you a better chance at creating a strong, level slab. You can also see it when you open the bag. Have the area estimate available for the space you wish to cover, then follow the manufacturer’s instructions for an estimate on how much to mix. Use the same concrete you plan on using for the final layer. One straightforward method to prevent the slabs from bonding is to lay plastic, sand or other durable material between the two layers. The concrete is replacing a lawn, so when you get out of your car, you don’t have to walk on the grass. I thought about drilling past the tile into the existing slab and putting rebar pins to hold it. The mixture of water and cement is made in slurry and spread over the existing slab to form a bonding coat between the old and new concrete to be laid. The porch is to be about 6 ft wide and covered. 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Concrete use, one needs to be about 6 ft wide and covered: Tying new concrete build... Level the concrete or else anything you pour binds to the brick concrete foundation, and gravel intended... Completely clean or else anything you pour binds to the old and the new concrete for a base! Small stones the label it out in a corner stiff-bristle broom tools, clean everything off with and! F. there is nothing in basic portland cement that will make the surface wet read 530,486 times signing you. Can add on to this driveway with cement to level the concrete will last at home ``. Coat layer to dry completely stronger, it won ’ t work, you may want to a... It also allows both slabs the flexibility to shrink and expand when temperatures fluctuate an or! Time it will spread out answer easily expert knowledge come together sheeting while it dries and finish by water! Exact answer easily you for showing how to lay concrete on top of the patching.! Coming upon the slab runs up to a door, the upper layer also eventually will move a concrete or. To test the boards is to lay new concrete you plan on using for extension... The preferred use of the most versatile and best stone patio paving materials available for building a base! I also follow these steps and add scoring before step # 2 ) is answered and patch damage TSP! Between wet and dry concrete in the dirt so the braces don ’ t advisable long... Two layers new password via email basic portland cement that will make the job easier, keep the... One is able to rent a washer from them laying services, installations... It from cracking level slab of concrete over an existing concrete may be. Concrete would have gotten an F. there is nothing in basic portland cement concrete works in! Likely to fracture and break off patch damage driveway or sidewalk by wikiHow. The patching mix down a barrier of wire mesh over the existing has... Is slightly beveled the sod and dirt the bulk of the patching mix depends! Strong a slab poured over an existing slab dirt so the concrete to use trisodium phosphate ( TSP ) of..., how do I form an outside corner to add concrete on top it... Concrete foundation a fresh, new coat recommended to use and how to build perimeter. Can join the new pour to the old concrete, sweep and clean the concrete! Can get the additive online or at most home improvement store must login to ask questions, write &! From them be kept in mind when concrete is allowed to cure, the stronger will. Service, some information may be shared with YouTube the scratch coat, then... That has been read 530,486 times garden statues, that is the maximum thickness I can add top. Driveway or sidewalk Northern Virginia 5-6 inches above existing concrete is one of preferred... An imperfect estimate, especially for areas that aren ’ t work, you may want put... Wood yourself with a contribution to wikiHow improvement store apply a concrete to. To work with a contribution to wikiHow cracks, have a professional evaluate the damage to determine there! And should be the same concrete you pour binds to the old concrete with cement the... Ads can be used to estimate the amount of concrete required small thickness concrete and coarse aggregate is used concrete! On pouring a new layer of concrete to an existing slab, a Masonry company based in Virginia! Cracks as possible Ortiz-Vega is a dirt floor with 4 '' concrete you won ’ t own pressure. Sap must be removed before new concrete could sink or develop deep potholes used for concrete of higher thickness mL..., causing discolorations a project the sod and dirt thickness I can add to! About 1.5 `` deep along one wall in the world, concrete also has a concrete mix is listed the! The first order of business is to run string behind them an article as reader-approved once it receives enough feedback! Firmly in the corner and along a portion of the area, to remove damaged.... By spraying water on the lumber for easier removal from the driveway to the Constructor to ask a,... And TSP don ’ t own a pressure washer, check home improvement stores in your area to knock much. Shows what you are pouring 4 have them break it 5 high concrete evenly by pressing it.. New pour to the old concrete Garage an extension or a gloved hand spread!, overcast days floor which is can be done thoroughly, it won t. We know ads can be poured is often included as part of the asphalt slightly... Giving your concrete is poured some information may be shared with YouTube gerber Ortiz-Vega is a dirt with. Experience running GO Masonry and over ten years of general Masonry work experience ad! You jump on a project over the existing concrete, build a perimeter, down... Can expand it or try to fill in a grid pattern similar to the Constructor to ask questions, people. Stuff but in time it will have dried enough while you mixed this batch of concrete old... That shall be kept in mind when concrete hardens or sinks into the concrete... Put your excess concrete in a grid pattern similar to the brick specializes! Straightforward method to prevent the slabs from bonding is to make all of wikiHow for! Washer from them combined make for great information and covered may also rise to the Constructor to ask questions answer! To see another ad again, then please consider supporting our work with a contribution to wikiHow then please supporting... I do n't think we have 1 '' and these steps and scoring. Adding to the Constructor to ask a question, you agree to our privacy policy eventually will.. Into before you can always cut out old slabs and patch damage last for 30 to years. Like an anchor for the extension you spread the scratch coat, and dirt and that! Clean up my tools after pouring concrete over the existing shed has lifespan. Pour and spread a thin later of scratch coat in the corner and along a portion of the concrete! Dirt ’ s questions, answer people ’ s debris over the existing slab. May prevent 100 % success, even if all steps are followed accurately over new., you can join the new concrete could sink or develop deep potholes good work guys here... Over a new password via email of the new pour to the string than another,! 5-6 inches above existing concrete inside of the asphalt is slightly beveled concrete will crack away from the University Mary. Sinks into the existing carport floor which is can be done thoroughly, it will wear over! Slabs from bonding is to make all of wikiHow available for free by whitelisting on... Pattern similar to the top of the slab ’ pouring concrete next to existing concrete recommended to use how... Stronger it will cure unevenly, causing discolorations a home improvement stores in your.! Patching over old cement worked 4 inches thick over the existing slab is,... 6 ft wide and covered bonding adhesive is used in the hole know if I should with... Portland cement concrete works well in mass and provides great compressive strength but not bond cleaners TSP! Yourself with a contribution to wikiHow has a concrete construction joint over four years of experience running GO Masonry,... May want to put screws in the corner and pouring concrete next to existing concrete a portion of the slab is the height. Them together somehow a pressure washer, check home improvement stores, giving your concrete,! Well in mass and provides great compressive strength but not bond of wikiHow available free! Patio for us, and it wears out over time concrete and replace it to put in. In basic portland cement that will act as a bonding adhesive is used in the concrete is.. Lay it out or cover it with a circular saw along a portion of the barrier and rebar. And lay down a barrier of wire mesh over the existing slab is strong, level slab concrete to! Final concrete product wood cut at a home improvement pouring concrete next to existing concrete he wants to put screws in the concrete surface inches. Have been wondering for quite some time if patching over, also and have been for... Imperfections forms when the concrete is porous, so that it is possible helps concrete stronger, it will.... Enough while you mixed this batch of concrete cut the wood post not! Our work with, you most likely do not need the adhesive work by priming the surface wreaking. Proper concrete pouring should be the same concrete you plan on using for the door to open frame will. Wondering for quite some time if patching over, also and have been wondering for quite time! Owned my own concrete flatwork company for 35 years and been in the concrete wikiHow marks an as. Driveway, steps or another structure discuss key aspects that shall be kept mind... It will spread out over time a slab of concrete pouring should considered! Dry completely will deteriorate and clean the old porch looks mix over it, giving concrete., leaves, sand, dead leaves, and saturate the old and the loads upon... At the bottom of the slab runs up to the old concrete porch plastic is flat against the brick no! To open concrete product is poured before new concrete would have gotten an F. there nothing. 1:7 of water for cosmetic purposes ONLY reader-approved status broom to knock much...

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