How to Use Self Leveling Compound?

If you're new to using a self-leveling compound, we recommend hiring a professional to do the job for you. Working with polymer-modified cement that has a high flow capacity can be challenging, and it's best left to those who are highly confident in their DIY skills. However, if you're determined to give it a try, we've put together this step-by-step guide to help make the process as straightforward as possible.

How to Lay Self Leveling Compound

Self leveling compound works on all types of substrates, including screed, concrete and even existing tiles and timber. It's great for uneven floors. However, there are various preparation methods required to make sure the end result is smooth and flat.

First, check how uneven your floor is, as a floor leveling compound isn't ideal for discrepancies greater than 5mm. An easy way to assess this is by using marbles or other smooth balls. Drop them at various points on your floor to identify the deepest dips. Next, take a 6ft spirit level and place one edge in the dip. Lift the other side until the bubble is centered. Then, use a ruler to measure the resulting gap. If it's more than 5mm, you'll need to find an alternative method to level your floor.

Tools you'll need for the job

Scraper

Filler

Duct tape

Primer

Self leveling compound

Mixing paddle

Large bucket

Steel trowel

Spiked roller

A sturdy drill

How to Use a Self-Leveling Compound

Prepare the Substrate

Once you're sure you can use a self-leveling compound, your next step is to prepare the substrate (base) of your floors. Use a scraper and a hard-wired brush to remove any dirt and debris, then sweep and vacuum thoroughly.

To prime your floor, start by cleaning it to remove contaminants such as floor paint, adhesives, and laitance. This prevents the compound from bonding to these materials instead of the substrate. If your floor is silky smooth, roughen it slightly to ensure a stronger bond with the compound.

After cleaning and roughening the surface, apply a floor primer and let it dry overnight.

Mix the Compound

Take your bucket and follow the instructions on the self-leveling compound package. Typically, this involves adding a specified amount of cold water first and then slowly introducing the compound. Use a mixing paddle or electric mixer to blend the mixture until it's lump-free and has the right consistency.

Pour the Mixture

Once the compound is ready, begin pouring it onto the floor starting from the farthest corner of the room and work your way backward. Use a steel trowel to spread the compound evenly in sections. Follow up with a spiked roller to eliminate any air bubbles. Continue this process until the entire floor is covered, smooth, and free of bubbles.

Leave to Dry

Ensure the room is well-ventilated and maintains a temperature of around 20 degrees Celsius. Avoid exposing the compound to strong sunlight or cold drafts, as these can cause uneven drying and lead to issues like cracking or crazing. If you have underfloor heating, make sure to use a latex polymer compound to accommodate the heating system.