Are Self-Levelling Compounds Truly Waterproof?
It’s a common misconception that self-levelling compounds are inherently waterproof. The actual waterproofing capability largely depends on the type of self-levelling compound used and how it is mixed or formulated. Self-levelling compounds come in various formulations, each with distinct waterproofing characteristics. Much hinges on what the cement or binder component is combined with during preparation.
External vs. Internal Use of Self-Levelling Compounds
It’s crucial to note that only specialized external self-levelling compounds are suitable for outdoor applications. Most self-levelling compounds are designed for internal use as an underlayment beneath floor coverings. In such cases, the waterproofing of the final floor covering provides protection against moisture ingress. For outdoor or damp environments, choosing the correct type of self-levelling compound is essential.
Waterproofing Qualities of Water-Mixed Self-Levelling Compounds
Self-levelling compounds that are mixed with water possess similar waterproofing properties as traditional cement or concrete. When calculating the required amount for your project, consider using a self-levelling compound calculator to streamline the estimation process. These compounds are porous and can absorb water if they become saturated, but when used outdoors, they typically repel water by causing droplets to bead and roll off their surface.
Porosity and External Use
Despite their porosity, external self-levelling compounds are formulated to be resistant to water penetration. Think of them as being akin to fine cement particles suspended in a water-based solution, which helps understand their behavior. They can tolerate exposure to moisture without compromising their integrity, especially if they are designed for outdoor applications.
Mixing Self-Levelling Compound with Latex for Enhanced Waterproofing
When self-levelling compounds are mixed with latex—a natural rubber known for its waterproof properties—they become significantly more resistant to water ingress. Latex enhances the density and impermeability of the compound, making it suitable for damp or high-moisture environments. For example, Arditex NA is a latex-based self-levelling compound that remains unaffected by moisture, allowing direct application over damp-proof membranes or damp concrete surfaces.
Recommended Products for External and Damp Areas
- Bostik Cempolay Self-Levelling Compound: Water and frost resistant, ideal for garage floors and external resurfacing. Buy now on Amazon
- Ardex NA (Arditex NA): A powder and latex mixture that is virtually waterproof, requiring no priming, and easy to spread. Suitable for all subfloors, including damp ones. Buy now on Amazon
- Bostik Cempolay Ultra Strong: Excellent for external resurfacing, especially in garages and areas prone to moisture. See the product data sheet for more details.
Summary: Waterproofing Capabilities of Self-Levelling Compounds
Overall, self-levelling compounds offer varying degrees of waterproofing, primarily influenced by their porosity. Latex-enhanced compounds like Ardex NA are nearly impermeable and ideal for high-moisture conditions. External compounds such as Bostik Cempolay Ultra Strong are designed to withstand outdoor exposure, providing good waterproofing despite being mixed with water. It’s important to remember that perfect waterproofing isn’t always necessary; many applications function effectively with compounds that are resistant to water absorption rather than entirely waterproof.
Common Questions About Self-Levelling Compounds
- How thick can you pour self-levelling compound?
- Can you use self-levelling compound outside?
- Can you use self-levelling compound on asphalt flooring?
- Can self-levelling compound be built up in layers?
- What paint should I use on self-levelling compound?
- Do I need to seal concrete before applying self-levelling compound?
- Can you use out-of-date self-levelling compound?
- Does self-levelling compound need a spiked roller?
- Can you use self-levelling compound over chipboard?
- How long does self-levelling compound take to dry?
- Can you use self-levelling compound on bitumen?