How to Use Self-Levelling Compound: A Step-by-Step Guide

Self-levelling compound, also known as a self-levelling screed, is an essential tool in flooring projects, particularly for creating a smooth, even base on which to lay tiles, wood, or other flooring types. Widely used in the UK for professional and DIY projects alike, this compound helps cover imperfections in concrete and other floor surfaces quickly and easily. Here’s a step-by-step guide on how to use self-levelling compound effectively.

 

What Is Self-Levelling Compound?

Self-levelling compound is a cement-based mix with polymer added to create a smoother, more fluid consistency. It is used to even out uneven concrete floors, fill dips, and create a uniform surface. Once mixed with water, the compound flows to level itself out, which makes it ideal for patching uneven areas.

 

Tools and Materials You'll Need

  1. Self-Levelling Compound (available in different brands and types)
  2. Large Mixing Bucket
  3. Electric Paddle Mixer or Drill with Mixing Paddle Attachment
  4. Steel Smoothing Trowel or Self-Levelling Spiked Roller
  5. Protective Gear (gloves, mask, and safety goggles)
  6. Priming Solution (depending on the surface, primer may be required)
  7. Water (follow product instructions)
  8. Measuring Jug

 

Preparation Steps

  1. Assess and Prepare the Subfloor
  • Clean the Surface: Clear the area of any debris, dust, and grease, as these can prevent the compound from adhering properly.
  • Repair Any Major Damage: Fill any deep cracks, holes, or significant imperfections in the subfloor with a suitable filler.
  • Check for Moisture: Self-levelling compounds require a dry surface. Use a moisture meter if available, or follow the manufacturer’s guidelines on acceptable moisture levels.
  1. Prime the Floor (If Necessary)
  • Apply Primer: For porous or highly absorbent floors, a primer is usually recommended. Priming helps the compound adhere better and prevents it from drying too quickly.
  • Drying Time: Allow the primer to dry as per the manufacturer's instructions before applying the self-levelling compound.
  1. Calculate the Amount of Compound Needed
  • Measure the Area: Calculate the square footage of the room or area to determine how much self-levelling compound is needed. The packaging typically indicates the coverage area per bag, so use this to estimate the amount.

 

Mixing the Self-Levelling Compound

  1. Follow the Manufacturer’s Instructions
  • Ratio of Water to Compound: Most self-levelling compounds have a specific water-to-compound ratio. Follow this precisely for the best results.
  • Mix Thoroughly: Use a paddle mixer or a drill with a mixing paddle attachment to ensure a lump-free, smooth consistency. Avoid mixing for too long, as this can introduce air bubbles.
  1. Working Time
  • Act Quickly: Self-levelling compounds begin to set within minutes of mixing, so only mix what you can use within 20-30 minutes.

 

Pouring and Spreading the Compound

  1. Pour the Compound on the Floor: Start in a corner of the room, and pour the mixture onto the floor. It will flow and spread across the surface.
  2. Use a Trowel or Roller to Spread: Use a steel trowel to help the compound flow smoothly, ensuring it reaches all corners and edges. A spiked roller can also be helpful in removing air bubbles and achieving a smooth finish.
  3. Let the Compound Set: Allow the compound to cure as per the instructions on the packaging. In most cases, it takes 24 hours to dry, but check for specific drying times, as they may vary.

 

Finishing Touches

Once the self-levelling compound is dry, you’ll have a smooth, even surface ready for the final floor finish, whether it's tiles, laminate, or carpet.

 

Common Mistakes to Avoid

  1. Incorrect Water Ratio: Adding too much water can cause the compound to weaken, while too little water makes it difficult to spread.
  2. Skipping the Primer: Not priming a porous floor may lead to a failed application.
  3. Working Too Slowly: Self-levelling compound sets quickly, so make sure to work efficiently.
  4. Applying Too Thickly: The compound should be applied within the recommended thickness range; otherwise, it may crack or cure improperly.

 

Safety Tips

  • Wear Protective Gear: Always wear gloves, a mask, and goggles to protect yourself from dust and chemicals.
  • Ventilate the Area: Ensure good ventilation, especially if you're working in a confined space.
  • Dispose of Waste Correctly: Follow local regulations for disposing of any leftover compound.

 

Self-levelling compound is a fantastic solution for creating a smooth, level surface for any flooring project. Following these steps ensures a successful application, so you’ll have a durable, even base that’s ready for any finish you choose. Always check the manufacturer's instructions for specific details, and remember to work safely and efficiently for the best results.

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