![]() Be sure to drill the holes 12 inches on center. Drill ⅝ diameter holes to be 6 inches deep into the old concrete.Here are the steps to make sure you bond new concrete with old concrete correctly: Heavy concrete will, of course, use heavier rebar, but smaller concrete such as sidewalk or driveway will only require about half an inch of rebar. The size of the rebars really depends on the size of the concrete. Rebar is short for reinforcing bar, meaning the bars are used to support and strengthen the bond between the two slabs. One way to help prevent that when attaching them is to use rebar to pin them together. If you don’t do everything possible to prevent that, you may be replacing the concrete sooner than you would like.Īny time one is to attach new concrete to old concrete, it is likely for cracks to form and the sections will begin to separate. Though it is possible to attach new concrete to old concrete, it is important to do it the right way to keep any cracks or separation from setting in too quickly. How Do You Attach Concrete to Old Concrete? However, plastic isn’t recommended for anyone trying to protect the planet. This layer of separation can come in the form of stones, sand, or even plastic. It is important to add a layer of separation between the two slabs for flexibility and longevity. If there are any cracks in the old concrete, they would spread into the new concrete in pretty quickly. Without somehow separating the old concrete from the new concrete, cracks would be guaranteed. You could solve that though by creating a small ramp. The walkway would be several inches taller than the driveway which you surely wouldn’t want. If you were to add a few inches of concrete to a walkway leading to your driveway, you could create a tripping hazard for people that do not realize the gap. You need to be aware of any doors or staircases around that may ruin your chances of adding concrete on top. I mentioned how it is important to be aware of the surroundings before pouring new concrete on top of the existing concrete. After all, the condition of the existing slab determines the condition of the new concrete. If you do pour new concrete on the old concrete, you are risking the chance of getting deep potholes. If you were to tear old concrete out and replace it with new, well-poured concrete, you could save yourself a lot of trouble by maximizing the lifespan of your concrete. Pouring new concrete over an existing slab can, however, cause some issues outlined in this article and limit the lifespan. Most concrete can last for many years, and in some cases, you may never have any problems with your concrete. If all else fails, bring in a professional to see what the problem is. It is also important to seal the new layer and prevent any water damage by using a deep penetrating sealer. The fluctuation of the temperatures will cause lifting of the concrete which will cause cracks and separation.Īs soon as you spot damage, make sure to patch them immediately to avoid any spreading. So, knowing how thick a concrete slab should be, is a must for a good result.įrost heaves are caused by the combination of freezing temperatures and the soil defrosting below. For example, pouring new concrete on an existing slab brings a chance of frost heaves to the equation. Maintenance: As you can imagine, layering concrete on top of concrete can eliminate the low maintenance that concrete is often admired for.Below are a few cons you may want to consider: Though it can be useful, everything has its pros and cons. If you are able to pour new concrete over old concrete, you probably want to know the risks you’d be taking by doing so. Stepping stones or a pathway to a house.In each of these situations, you should remove the old concrete, resolve the existing problem, such as removing the tree roots, and continue with brand new concrete.īut, here are some instances where you can put new concrete over old concrete: Substantial cracks in the concrete or it is not level.Tree roots are in the way, causing the existing concrete to lift or move.If there is a door or staircase that would be in the way of adding a few inches of cement. ![]() You can put new concrete over old concrete, however, there are many times you will not want to, including: Can You Put New Concrete Over Old Concrete? ![]()
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