The load capacity of the wall will determine the strength requirements, which can affect the viability of installing retaining wall blocks over existing concrete.
4. Drainage: Proper drainage is crucial for any retaining wall. If the existing concrete does not have built-in drainage systems or slope away from the wall, water accumulation could compromise the structure. It is essential to evaluate the drainage conditions before proceeding with installation.
Installation Methods
If the existing concrete meets the necessary criteria and you’ve evaluated all the factors mentioned above, there are a few methods for installing retaining wall blocks over concrete:
- Adhesive Approach: One option is to use a construction adhesive specially formulated for masonry applications. This adhesive helps bond the blocks to the concrete surface securely. However, it’s important to note that this method may require additional reinforcement, as the adhesive alone may not provide enough stability.
- Floating Approach: Another approach involves constructing a freestanding retaining wall in front of the existing concrete. By doing this, you create a gap or “float” between the old concrete and the new wall. This method avoids attaching the retaining wall blocks directly to the existing concrete and provides more flexibility in managing any potential drainage issues.
Professional Consultation
It is always recommended to consult with a professional or a structural engineer before proceeding with the installation of a retaining wall. A professional can assess the existing concrete condition, determine load requirements, and provide expert advice on the most suitable installation method for your specific situation.
While it is possible to install retaining wall blocks over existing concrete, several factors need to be considered to ensure a stable and long-lasting structure. Proper evaluation, including the condition of the existing concrete, load capacity, and drainage considerations, is vital. Consulting a professional can help you navigate the installation process and make informed decisions for your retaining wall project.