Why Standard Self-Levelling Compounds Are Not Suitable for Asphalt
Traditional self-levelling compounds are designed to be mixed with water and applied to smooth, porous surfaces like concrete or cement screeds. However, asphalt is a non-porous, smooth material that does not bond well with these standard compounds. Applying water-based self-levelling mixes directly onto asphalt can lead to issues such as poor adhesion, cracking, and eventual flaking off, compromising the integrity of your flooring.
Recommended Solution: Ardex NA for Asphalt Surfaces
For asphalt substrates, it is advisable to use Ardex NA, a specialized two-part latex-based self-levelling compound. This product consists of a latex component and a self-levelling cement powder, which are mixed together immediately prior to application. Ardex NA is specifically formulated to adhere effectively to asphalt, providing a durable, smooth surface suitable for subsequent flooring installations.
Before applying Ardex NA, ensure the asphalt surface is thoroughly cleaned by sweeping and vacuuming to remove debris, dust, and loose particles. This preparation step ensures optimal adhesion and a seamless finish. No additional surface treatment is necessary, but good practice recommends a clean, dry, and sound substrate for best results.
Understanding Self-Levelling Compounds
Self-levelling compounds, also called floor screeds or floor leveling mixes, are cement-based formulations designed to create a flat, smooth surface over uneven floors. Typically applied in thin layers, these compounds are poured onto substrates like concrete slabs or wooden floorboards to correct irregularities before installing final floor coverings such as tiles, laminate, or hardwood.
The term “self-levelling” refers to the properties of these mixes that allow them to flow and settle evenly under gravity, reducing the need for manual leveling. However, while they are highly effective over small to medium areas, they do have limits in their ability to flatten very large or deeply uneven surfaces without additional support or multiple layers.
Why Use Self-Levelling Compounds?
The primary purpose of self-levelling compounds is to transform a bumpy or uneven subfloor into a perfectly smooth and level base. This is critical when installing rigid flooring types such as tiles, hardwood, or laminate, which require a stable, even surface. Without proper leveling, these floors may develop cracks, bounce, or even become damaged over time. Conversely, softer flooring options like carpet or vinyl can tolerate minor imperfections and do not always necessitate such prep work.
Related Topics and Further Reading
- How thick can you pour self-levelling compound? Learn about the maximum recommended layer thickness for different products.
- Can you use self-levelling compound outside? Discover whether external applications are suitable and what considerations are necessary.
- Can self-levelling compound be built up in layers? Understand the process for creating thicker layers through multiple applications.
- What paint to use on self-levelling compound? Find out which paints are compatible for finishing surfaces.
- Do I need to seal concrete before using self-levelling compound? Explore preparation steps for optimal adhesion.
- Can self-levelling compound be used past its expiry date? Learn about the risks and considerations of using outdated materials.
- Does self-levelling compound require a spiked roller? Understand the importance of de-airing tools for smooth results.
- Can you use self-levelling compound over chipboard? Find out suitability and preparation tips.
- How long does self-levelling compound take to dry? Get drying times and curing information.
- Can you use self-levelling compound on bitumen? Discover compatibility issues and alternatives.
- Does self-levelling compound crack? Understand common causes and prevention methods.