If you have an existing concrete structure that is in good condition, you can pour a new layer of concrete over it to give it a fresh look. The key to success is to properly prepare the surface before laying the new concrete. It is possible to place new concrete on top of old concrete, but any existing issues such as cracks or frost heave will remain if they are not addressed. The new layer should be at least two inches thick.
Concrete has a limited lifespan and can become damaged over time. Imperfections can form when the concrete hardens or sinks into the ground. Pouring fresh concrete over existing concrete is a common way to level out old slabs and patch up any damage. The answer is yes, you can pour new concrete over existing concrete.
However, there are some things to consider before making a final decision. Adding a new layer of concrete on top of an existing structure will not cause any problems as long as the old concrete is free from major damage such as large cracks or frost heave. You don't need to dig up the existing path and start from scratch; you can give it a new life with a fresh layer of concrete. Before pouring the new layer, make sure to clean the surface of any debris that may be hidden.
Another factor to consider is the height and depth of the surface. Pouring new concrete into an existing slab or path will result in a surface that is several inches higher than before. This could prevent doors from opening and closing, cause misalignment with stairs, or even create a trip hazard, so keep these aspects in mind when planning your project. According to Concrete Network, this can be done but precautions must be taken to ensure that the existing surface is suitable for the job.
Every time new concrete has to be attached to old concrete, cracks are likely to form and sections begin to separate. If the base under the slab is not solid, new concrete could sink or develop deep potholes. When dealing with slabs that will be exposed to vehicle traffic, the concrete should be thicker and no bond breaker should be used so that the top slab is joined to the existing slab. If there are large working cracks in the slab and the concrete has settled to different levels, it should be removed.
However, if the concrete is solid with small cracks, pitting, scaling, surface damage or just looks unattractive, you can pour a new layer of concrete over it. Pouring a new layer of concrete over an existing walkway, patio or porch will raise its level by several centimeters. A bonding adhesive should be used on the concrete to ensure that it adheres properly to the existing surface. Heavy concrete will require heavier rebar while smaller projects such as sidewalks or driveways will only need about half an inch of rebar. As polished concrete floors become more popular, many homeowners are looking for ways to cover up old tiles. In each of these cases, you must remove old concrete, address any underlying issues such as tree roots and then proceed with pouring new concrete. At Geostone we offer durable and long-lasting decorative solutions with a warm and welcoming appeal for all your concreting needs.
Whether you decide to pour new concrete onto an existing surface or start from scratch, we have you covered.