In most cases, it is indeed possible to apply a second layer of floor leveling compound if the initial application didn’t achieve the desired level. However, before doing so, it is necessary to address the causes of the irregularity in order to prevent the issue from recurring. Here are some important considerations:
- Subfloor Preparation: Ensure that the subfloor is clean, dry, and free from any debris, dust, or moisture. If necessary, remove any loose or crumbling materials and repair any structural issues before proceeding with the second layer.
- Identifying High and Low Spots: Use a long straightedge, such as a level or a laser level, to identify high and low spots on the subfloor. Mark these areas for targeted application of the second layer, focusing on the lower spots to achieve a level surface.
- Feathering and Blending: Before applying the second layer, it is essential to feather and blend the edges of the existing compound. This ensures a smooth transition and prevents visible lines between the layers. Use a sanding block or a floor grinder to gently taper the edges and create a seamless finish.
- Recoating Guidelines: Different floor leveling compounds have different guidelines for recoating. It is crucial to refer to the manufacturer’s instructions to determine the recommended time frame for applying the second layer. Some compounds may require sanding or priming the first layer to enhance adhesion before adding the second layer.
In summary, if the first layer of floor leveling compound does not result in a level surface, applying a second layer is often a viable option. However, it is crucial to identify and address the underlying causes of the unevenness to prevent the same issue from arising again. Proper subfloor preparation, targeted application to high and low spots, feathering and blending, and adherence to manufacturer guidelines ensure the effectiveness of the second layer. Always refer to the manufacturer’s instructions for specific guidance on each product, as different compounds may have slight variations in application requirements. By following these steps, a level and smooth surface can be achieved, providing a solid foundation for the final flooring installation.