Achieving a perfectly smooth and level floor is a game-changer for any renovation or construction project. Whether you’re preparing a concrete subfloor for tiles, vinyl, or polished concrete, self-levelling compound is your go-to solution. But applying it correctly is key to a flawless finish. In this guide, we’ll walk you through the best practices for using self-levelling compound over concrete, optimised for both DIY enthusiasts and professionals in Sydney, NSW. Follow these steps to ensure a durable, professional result every time. Why Use Self-Levelling Compound? Self-levelling compound is a cement-based mixture that flows effortlessly to create a flat, smooth surface. It’s ideal for correcting uneven concrete subfloors, filling dips, and preparing surfaces for various floor coverings. Here’s why it’s a top choice: Ease of Application: Its fluid consistency self-corrects, reducing manual levelling efforts. Quick Setting: Most compounds are walkable within 2–4 hours, speeding up project timelines. Versatility: Suitable for concrete, timber, tiles, and even outdoor areas when using specific formulations. Durability: High-strength compounds, like those with a 40MPa rating, withstand heavy traffic. Whether you’re renovating a home or a commercial space in Sydney, self-levelling compound ensures a stable foundation for your flooring vision. Step-by-Step Guide to Applying Self-Levelling Compound To achieve a flawless finish, preparation and technique are critical. Follow these best practices for optimal results. 1. Assess and Prepare the Concrete Subfloor A clean, stable subfloor is the foundation of a successful pour. Here’s how to prep: Inspect for Damage: Check for cracks, holes, or loose sections. Patch large cracks with a concrete repair mortar. Clean Thoroughly: Remove dust, dirt, grease, or old adhesives using a broom, vacuum, or degreaser. Test for Moisture: High moisture levels can degrade the compound. Use a Rapid RH L6 system to test per ASTM F2170 standards. If moisture is an issue, apply an epoxy moisture barrier. Grind High Spots: Use a concrete grinder to level out humps or uneven areas. Pro Tip: For older concrete slabs, ensure they’re fully cured and have a wood float finish for better adhesion. 2. Prime the Surface Priming enhances adhesion and prevents the compound from drying too quickly. Follow these steps: Choose the Right Primer: Use a water-based primer for porous concrete or an epoxy primer for non-porous surfaces. Apply Evenly: Roll or brush the primer across the entire surface, ensuring no puddles form. Allow Drying Time: Let the primer dry completely (typically 1–2 hours) before pouring the compound. Note: Skipping the primer can lead to cracking or poor bonding, especially on wooden or tiled subfloors. 3. Mix the Self-Levelling Compound Proper mixing ensures a smooth, lump-free consistency. Here’s how: Follow Manufacturer Instructions: Use the recommended water ratio (e.g., 4.2–4.6L per 20kg bag for Dingo Floor Leveller). Use the Right Tools: Mix with a heavy-duty drill and paddle attachment at 600rpm max to avoid aeration. Mix in Small Batches: Prepare only what you can pour within 10–15 minutes to prevent premature setting. Tip: If the mixture foams or streaks, it’s over-watered and won’t bond properly. Start over with less water. 4. Pour and Spread the Compound The pour is where the magic happens. Follow these steps for a seamless application: Work in Sections: Pour in small, manageable areas to maintain control. Use a Gauge Rake: Spread the compound to the desired thickness (1.5–40mm, depending on the product). Smooth with a Spiked Roller: Roll over the surface to remove air bubbles and ensure an even finish. Maintain a Wet Edge: Pour the next section before the previous one sets to avoid seams. Pro Tip: Wear spiked shoes to walk across the wet compound without leaving footprints. 5. Allow Proper Curing Curing time varies by product and environmental conditions. General guidelines include: Avoid Foot Traffic: Most compounds are walkable in 2–4 hours but require 24 hours before installing floor coverings. Control Temperature: Keep the area between 10–25°C to prevent cracking. Protect from Disturbances: Ensure no debris or water contacts the surface during curing. For thicker applications (up to 50mm), apply in layers, allowing each layer to cure before adding the next. Common Mistakes to Avoid Even seasoned pros can make errors. Here are pitfalls to watch out for: Skipping Surface Prep: Unclean or unprimed surfaces lead to poor adhesion and cracking. Incorrect Mixing: Too much or too little water compromises strength and flow. Rushing the Pour: Self-levelling compounds set quickly, so plan your workflow to avoid interruptions. Ignoring Moisture: High moisture levels can cause the compound to fail over time. Using Indoors Products Outdoors: Ensure the compound is rated for exterior use if needed. Choosing the Right Self-Levelling Compound Not all compounds are created equal. Consider these factors when selecting a product: Compressive Strength: For high-traffic areas like carparks or warehouses, choose a compound with a 40MPa rating, like Cemimax DL59. Application Thickness: Some compounds allow 1.5–40mm in one pour, while others are limited to thinner layers. Indoor vs. Outdoor Use: Fibre-reinforced compounds are ideal for outdoor applications. Polishable Finishes: For decorative floors, opt for compounds that can be polished or tinted. Recommendation: At Elyment Group, we trust premium products like Cemimax DL59 for their versatility and high performance in both residential and commercial projects across Sydney. Key Takeaways Prepare Thoroughly: Clean, repair, and prime the concrete subfloor to ensure adhesion. Mix Carefully: Follow manufacturer guidelines for a smooth, lump-free consistency. Pour Strategically: Work in sections and use tools like gauge rakes and spiked rollers for a flawless finish. Cure Properly: Allow adequate curing time to avoid compromising the compound’s strength. Choose Wisely: Select a compound suited to your project’s traffic, thickness, and environmental needs. Next Steps for Your Flooring Project Ready to transform your floors with self-levelling compound? Whether you’re a DIYer or a contractor in Sydney, proper execution makes all the difference. For expert advice, high-quality products, or professional installation, connect with the team at Elyment Group. Follow us on X at @ElymentGroup or visit elyment.com.au to explore our services. Source Inspiration: This article draws on expert insights from industry leaders like Imperial Flooring Australia and our own expertise at Elyment Group. 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