problems with self-leveling concrete

Self-leveling concrete is a convenient and effective solution for achieving a smooth, level surface, especially in preparation for flooring installations like oak solid floor. However, as with any construction material, it can present challenges during and after application. Let’s explore some common problems and solutions related to self-leveling concrete, focusing on a specific case involving a latex self-leveling compound.

Problem: Lumps and Bumps in Self-Leveling Concrete

  1. Description of the Issue:
    • After applying a latex self-leveling compound, the surface dried with lumps, bumps, and trowel marks, rather than settling into a flat, smooth finish.
  2. Potential Causes:
    • The consistency of the mix: If the mixture is too thick, like treacle, it might not flow correctly, resulting in an uneven surface.
    • Application technique: Improper spreading and leveling with a trowel can leave marks and uneven areas.

Solutions and Tips

  1. Removing High Spots:
    • Use a coarse sanding block or an old saw to scrape off high spots. This method is effective when the compound is still somewhat green (not fully cured).
  2. Reapplication Considerations:
    • When reapplying, ensure the mix is runnier to enhance flow, but be careful not to make it overly liquid. Follow the manufacturer’s guidelines for the mixture consistency.
  3. Using a Spike Roller:
    • Utilizing a spike roller during application can help eliminate bubbles and ensure a more even distribution, minimizing bumps and trowel marks.
  4. Assessing the Existing Layer:
    • If you’ve already applied a layer and it’s not level, you can apply more self-leveler in low areas. However, ensure compatibility between different products if using a different brand or type for the second layer.
  5. Understanding Moisture Content:
    • Always check for moisture content in the subfloor before applying a self-leveler. High moisture levels can adversely affect the curing and adhesion of the compound.
  6. Professional Insight:
    • Don’t hesitate to seek professional advice or assistance, especially if you encounter recurring problems or are unsure about the product’s properties.


Self-leveling concrete, while user-friendly, requires careful preparation and application to achieve the desired result. The right mixture consistency, proper application techniques, and appropriate tools like spike rollers can make a significant difference in the outcome. If difficulties persist, professional consultation is advisable to avoid further complications and ensure a successful installation. Remember, self-leveling compounds are designed to ease the leveling process, but they still require a level of skill and attention to detail for optimal results.

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