Levels and Solutions: How to Make Your Existing Concrete Level

Concrete leveling can be a challenging task, but it is achievable with the right tools and techniques. Whether you need to make small adjustments or major corrections, there are multiple methods to achieve a level surface. In this article, we explore three primary approaches to level your concrete slab, with a detailed discussion on what each method entails and when it is best to use it.

Understanding the Levelness of Concrete

When referring to the levelness of concrete, a deviation of up to -3mm over a 3-meter length is generally considered to be level. This standard is crucial when determining the requirements for minor and major concrete leveling projects. Knowing the specific tolerances is essential for choosing the right method for your particular situation.

Methods for Leveling Concrete

1. Minor Tolerances (8mm)

If the tolerances are within 8mm, setting out a precise grid using a laser or dumpy level is the best approach. Set out a 3-meter grid and record the heights at each point. Once the elevations are marked, hire a floor grinder to level the surface. Regrind the surface after every four or five passes to ensure a smooth and level result. This method, when done expertly, can bring the surface back within 3mm of level.

2. Using a Floor Levelling Compound

For minor to moderate discrepancies, a levelling compound can be a useful solution. Mix the compound according to instructions and apply it to your concrete slab. The compound will fill in the low spots and self-level. This method is a good choice if you plan to install tiles or carpet over the concrete slab, as it provides a seamless and flat base.

3. Major Tolerances (25mm or More)

If the concrete slab has disparities of 25mm or more, a topping mix is recommended. This mix contains 7mm aggregate and must be leveled manually. This method may require some additional labor and time, but it can provide a robust and durable solution.

When and How to Correct Concrete Tolerances

Correcting concrete tolerances can be done in two ways:

Using Specific Machines: Concrete cutting machines can be used to remove excess concrete or to create a deeper level if needed. Filling Level Gaps: More concrete can be added to fill in the low spots and level the surface.

If you have the budget, hiring a professional to perform concrete leveling is highly recommended. For smaller areas, a concrete grinder can be used to achieve the desired results. For larger areas, consider hiring a professional with specialized tools and techniques, such as using expanding foam, which is faster and more cost-effective than replacing the entire concrete slab.

Hiring Professionals for Concrete Leveling

If you lack the equipment or expertise, consider hiring a professional for the job. Concrete leveling companies have the necessary tools, including lasers, to ensure precise and accurate leveling. They can provide a more efficient and professional finish, making the process easier and more reliable for homeowners and contractors alike.

In more complex scenarios, a concrete installer might be needed to drill a slab and raise it from underneath. This process involves applying pressure from below and pumping grout to fill the gaps, providing a robust and reliable solution for significant leveling issues.

To conclude, whether you need a small adjustment or a major renovation, the right leveling method can make all the difference. By understanding the appropriate techniques and seeking the help of professional expertise, you can achieve a level and durable concrete surface that meets your needs.