You cannot level a concrete floor with mortar.
According to information from 14-Mar-2023, mortars are unsuitable for leveling or patching existing concrete floors. This is because:
- Material Differences: Mortars have a different composition compared to self-leveling concrete and self-leveling cement.
- Thickness Limitations: Mortar becomes unstable and unreliable when applied beyond the manufacturer's recommended maximum thickness. Therefore, using it to correct unevenness in concrete floors is not advisable.
Why Mortar is Not Suitable for Leveling Concrete Floors
| Aspect | Mortar | Self-Leveling Concrete/Cement |
|---|---|---|
| Purpose | Bonding, masonry, thin repairs | Leveling uneven surfaces |
| Material Composition | Different from concrete | Designed for flow and leveling |
| Thickness Limitations | Strict maximum limits | Can be applied in thicker layers |
| Stability when Thick | Becomes unstable | Maintains stability |
What Should You Use Instead?
Instead of mortar, you should use self-leveling concrete or self-leveling cement. These products are specifically designed to:
- Flow and Level: These compounds will flow and self-level over uneven concrete floors.
- Create a Flat Surface: Providing a flat and smooth surface suitable for flooring installation.
- Proper Adhesion: Bonding properly to existing concrete.
- Thickness Requirements: Can be applied to various thicknesses without losing structural integrity.
Steps to Level a Concrete Floor (Using Self-Leveling Compound)
- Preparation: Clean the concrete floor, removing dust, debris, or any loose particles.
- Primer Application: Apply a concrete primer according to manufacturer’s instructions to ensure proper bonding.
- Mixing Compound: Mix the self-leveling compound following the manufacturer’s guidelines for water to powder ratios.
- Pouring the Compound: Pour the mixed compound onto the floor, allowing it to spread and flow.
- Spreading & Smoothing: Use a gauge rake to even the material on the floor, smoothing any areas.
- Curing Time: Allow the compound to cure properly before proceeding with further floor works.
Important Note: Always consult product-specific instructions provided by the manufacturer.
