You can install pavers over an existing concrete surface, but there are certain factors to consider before moving forward with this method. While Viking Pavers, like many contractors, often prefer to demo the existing concrete, as it allows for better control over the foundation and long-term results, overlaying pavers on concrete can be an effective solution in the right circumstances.
Conditions for Installing Pavers Over Concrete
When laying pavers over an existing concrete surface, it’s important to ensure that the concrete is structurally sound. If the concrete has significant cracks, uneven surfaces, or signs of erosion, it may not provide a stable foundation for the pavers, and could lead to future issues such as shifting or settling of the pavers. The underlying surface needs to be even and solid to prevent future movement. If the concrete has minor imperfections, these can be corrected by applying a leveling compound.
Drainage Considerations
One of the most significant concerns when installing pavers over concrete is drainage. Concrete surfaces are typically impermeable, meaning that water doesn’t pass through easily. This can lead to water pooling between the pavers and the concrete, causing damage over time. To address this issue, contractors often install a drainage mat or apply a layer of sand between the pavers and the concrete to facilitate water runoff. Without proper drainage, water accumulation can weaken the integrity of the surface and lead to issues such as cracking, which is one reason companies like Viking Pavers often recommend removing the concrete first.
Benefits of Installing Pavers Over Concrete
Despite the challenges, there are some benefits to installing pavers over concrete. For example, by using the existing concrete as a base, you can save time and money that would otherwise be spent demolishing and hauling away the old surface. In addition, concrete offers a solid foundation that can support the pavers well, provided it is in good condition.
This method is also a faster option compared to starting from scratch, which could be beneficial for projects with tight timelines. Since the base is already there, the installation can focus more on setting the pavers and achieving the desired design, rather than preparing the area for paver installation from the ground up.
Moreover, overlaying pavers on concrete can be an eco-friendly option, as it minimizes waste and the need for additional raw materials. By reusing the existing concrete, you reduce the environmental impact of removing and disposing of old materials and bringing in new base materials.
Challenges of Installing Pavers Over Concrete
There are several reasons why contractors like Viking Pavers may advise against this approach. One of the primary concerns is that concrete, especially older slabs, may not remain stable over time. Cracking, shifting, or settling of the concrete can cause similar issues with the paver surface above it. Once installed, any movement in the concrete will likely translate into uneven pavers, necessitating repairs or a full redo.
Additionally, concrete surfaces tend to expand and contract with temperature changes, which can further impact the stability of the paver installation. If the pavers are not properly installed or if there is not enough room for expansion, this can result in cracking or loosening over time. While pavers themselves are generally more flexible than concrete, laying them over a concrete surface limits this flexibility.
Another concern is that by laying pavers over an existing surface, you may inadvertently raise the height of the surface, which can cause problems with thresholds, door clearances, or steps. This is especially important to consider near entryways and garages, where the added height can create tripping hazards or impact the functionality of doors.
Why Viking Pavers Prefers to Demo First
Given the potential risks associated with leaving the concrete in place, Viking Pavers typically prefers to demo the old surface and start fresh. By removing the concrete, they can install a proper paver base made of compacted gravel and sand, which offers better stability and drainage compared to an existing concrete slab. This allows for a more durable and long-lasting installation, ensuring that the pavers will stay level and in place for years to come.
In addition, starting from scratch gives the installers more control over the grading and leveling of the surface. This is crucial for proper water drainage, which helps to prevent water damage and erosion over time. A new base also ensures that the pavers are installed at the correct height, avoiding issues with thresholds or doorways.
While installing pavers over an existing concrete surface is possible and can offer certain advantages such as saving time and reducing waste, it’s not always the best long-term solution. The condition of the concrete, drainage concerns, and the potential for movement and cracking must all be taken into account before deciding whether to overlay pavers or demo the old surface. Viking Pavers, like many professional installers, typically prefer to remove the existing concrete to ensure a stable, well-graded base that will provide a high-quality, durable result. Ultimately, the decision depends on the condition of the current surface and your goals for the project.
