Floor Levellers

What are floor levellers and what are they used for?

Floor levellers, often referred to as self levelling compound or floor levelling compound, are cement-based or latex-modified products designed to create a smooth, flat and level surface before the final floor finish is laid. They are used as a preparatory layer over uneven subfloors to improve the surface and help ensure a better result for the finished flooring.

Whether you are preparing for tiling, vinyl, laminate or other floor coverings, levelling compound helps correct minor imperfections and creates a more consistent base. Floor levellers are an essential part of floor preparation in both domestic and commercial projects.

What is self levelling compound?

Self levelling compound is a type of floor leveller formulated to flow across the subfloor and settle into low spots, helping to create a level surface with minimal manual finishing. It is commonly used over concrete, screed and other prepared substrates where a smooth finish is required before laying the final floor covering.

Although referred to as self levelling, the product still needs correct mixing, preparation and application to perform properly. Used correctly, it can improve durability, provide a smoother surface and make the whole flooring project easier to manage.

Where can floor levellers be used?

Floor levellers can be applied over a variety of subfloors, depending on the product selected. Common surfaces include concrete, screed, existing tiles, timber floors and plywood. The right floor levelling compound will depend on the substrate, the required depth and the level of flexibility needed.

Some products are designed for standard internal floors, while others are suitable for demanding areas such as commercial settings, high traffic environments or spaces with underfloor heating. Always check the product details before use to make sure it is suitable for your project.

Are floor levellers suitable for timber floors?

Yes, some floor levellers are suitable for timber floors, but it is important to choose the correct product. Timber and plywood can move slightly over time, so a flexible or fibre reinforced levelling compound is generally the best option to help reduce the risk of cracking.

Latex-based and fibre reinforced products are commonly used on timber floors because they offer improved flexibility and adhesion. This makes them ideal where slight movement in the substrate is expected.

Can self levelling compound be used over concrete and screed?

Yes, self levelling compound is commonly used over concrete and screed to provide a smooth, level surface before the final flooring is installed. Standard, high-strength and deep-fill products are available depending on the condition of the floor and the application thickness required.

Concrete and screed subfloors should be clean, dry, sound and fully cured before the levelling compound is applied. A suitable primer is also usually required to improve bond and flow.

What thickness can floor levellers be applied at?

The correct thickness will depend on the type of floor levelling compound being used. Some standard levellers are suitable from feather edge to around 5mm, while medium-depth products are often used from 5mm to 30mm. For deeper uneven areas, a deep-fill compound may be required.

Deep-fill levellers are designed to handle more substantial variations in floor level and can sometimes be applied from 2mm up to 80mm in a single application, depending on the product. For thicker structural layers, traditional screed may still be the better choice.

What is the difference between floor levellers and screed?

Floor levellers are designed to create a smooth finish and correct minor to moderate unevenness before the final floor covering is laid. They are usually quicker to apply and dry faster than traditional screed, making them ideal for surface preparation work.

Screed is generally used for thicker, more structural layers and is often applied at much greater depths. It can take significantly longer to dry, whereas many self levelling products are ready for foot traffic and floor coverings much sooner.

When should you use a deep-fill levelling compound?

A deep-fill levelling compound is used when the floor has larger dips, hollows or more significant uneven areas that need to be corrected in one application. These products are designed for greater depth ranges than standard levellers and are often the right choice where the subfloor varies by more than 30mm.

Using the correct product for the application depth is important for performance, drying and durability. If the floor needs substantial correction, a deep-fill product can help prepare the surface more efficiently.

What type of floor leveller is best for tiles and non-absorbent surfaces?

Existing tiles and other non-absorbent surfaces usually require a high-adhesion floor levelling compound. In many cases, a flexible or 2-part product is preferred because it is better suited to challenging surfaces and can provide a stronger bond.

Correct preparation is essential, including thorough cleaning and the use of the appropriate primer if required. This helps the levelling compound bond properly and deliver a reliable finish.

Why choose a fibre reinforced levelling compound?

Fibre reinforced floor levellers are designed to provide added strength, flexibility and crack resistance. They are particularly useful where the substrate may be subject to slight movement or where the floor will need to cope with heavier use.

They are a popular choice for timber floors, demanding commercial areas and projects with underfloor heating. The added fibres help improve performance and support long-term durability.

Are floor levellers suitable for underfloor heating?

Yes, many floor levellers are suitable for use with underfloor heating, but the right product should be selected for the system and substrate. Flexible and fibre reinforced levelling compounds are often preferred because they are better able to accommodate thermal movement.

Using a levelling compound that is compatible with underfloor heating helps create a smooth surface while supporting the performance of the floor build-up. Always check the product information before application.

How quickly can you walk on floor levellers?

Drying and curing times vary depending on the product, thickness and site conditions, but many modern floor levellers are fast setting. Some rapid-setting compounds allow for light foot traffic in as little as 30 minutes to 3 hours, while others are usually ready for foot traffic within 2 to 4 hours.

Floor coverings can often be installed within 24 hours, and in some cases much sooner. Always review the product details for the expected drying time before planning the next stage of the job.

How do you prepare a floor before applying levelling compound?

Good preparation is essential for a successful result. The subfloor should be clean, dry, stable and free from dust, grease and loose material. Any cracks or damage should be repaired before the floor levelling compound is applied.

A suitable floor primer is usually required to seal the surface, improve bond and help the compound flow evenly. Proper preparation helps create a better finish and supports the overall durability of the floor.

How is self levelling compound applied?

Most self levelling compound products are mixed with water or, in some cases, a latex additive until a smooth, lump-free consistency is achieved. The mixed compound is then poured onto the prepared floor and spread across the surface to the required depth.

A spiked roller is often used during application to help remove trapped air bubbles and improve the final finish. Light ventilation is also recommended, especially in enclosed areas, to support the drying process.

Do floor levellers come in different types and products?

Yes, there is a wide variety of floor levellers available to suit different substrates, depths and project requirements. Options include standard self levelling compound, flexible products for timber floors, fibre reinforced levellers, deep-fill compounds and high-performance products for heavy-duty use.

Choosing the right item depends on the surface, the required thickness, the finish being laid and the conditions of the job. Reviewing the available products carefully can help you find the best option for your floors.

Need help choosing the right floor levelling compound?

If you are unsure which floor levellers are suitable for your project, our team can help. Whether you need a self levelling compound for concrete, a flexible levelling compound for timber floors or a product suitable for underfloor heating, we can help you choose the right option from the range.

View the available products on our website for more details on application, coverage, stock, price, collection and VAT, or get in touch for advice before you shop.