How to Choose the Best Floor Levelling Compound for Your Project

Selecting the right floor levelling compound is essential for achieving a smooth, durable, and professional flooring finish. With a wide variety of floor screeds, self-levelling compounds, and latex floor levellers available, it can be difficult to determine which product is best suited to your specific application.

Factors such as substrate type, installation depth, drying time, and compatibility with underfloor heating systems all play an important role when choosing a floor smoothing compound. From floor preparation and priming to renovation screeds and repair materials, we offer a complete flooring system designed to meet the demands of both domestic and commercial projects.

Below, we explore some of the most popular floor levelling solutions trusted by flooring professionals across a wide range of applications.

SLC 1550 FLEX Deep Fill – High-Performance FibreReinforced Screed

SLC 1550 FLEX is best-selling deep-fill self-levelling screed, developed to provide exceptional strength, flexibility, and reliability. This fibre-reinforced floor levelling compound is ideal for renovation projects where deeper applications are required.

As a single-component self-smoothing underlayment, it can be installed at depths up to 50mm while maintaining excellent performance. Its compatibility with underfloor heating systems makes it a popular choice for modern flooring installations. The product can be applied manually or pumped for larger commercial projects.

Designed for fast-track construction environments, SLC 1550 FLEX is widely used in offices, schools, hospitals, retail spaces, and transport hubs. With a rapid setting time of approximately two hours, it creates a smooth surface suitable for carpets, vinyl flooring, ceramic tiles, natural stone, and resin floor coatings.

SLC 100 – Reliable Floor Levelling for Concrete and Sand/Cement Screeds

For straightforward floor preparation projects, SLC 100 offers an effective and economical solution. This cement-based self-levelling compound is specifically formulated for smoothing common substrates such as concrete floors and traditional sand/cement screeds.

Capable of being applied from a feather edge up to 6mm thickness, SLC 100 provides a smooth and level surface ready for floor coverings. Foot traffic is typically permitted after four hours, making it a practical choice for everyday residential and commercial flooring work.

SLC 1500 Super Flow – Premium Finish for Thin Applications

SLC 1500 Super Flow is designed for projects requiring exceptional flow characteristics and a high-quality surface finish. Suitable for applications between 0–5mm, this cement-based self-levelling screed delivers excellent coverage and a smooth, professional appearance.

The product can be applied by hand or pump and is ideal for fast-track flooring installations where speed and efficiency are critical. Its quick-drying formulation allows foot traffic within 2–4 hours, helping contractors stay on schedule.

SLC 1500 is particularly well suited for underfloor heating installations and commercial environments including schools, offices, healthcare facilities, residential developments, and airport flooring projects.

SLC 3015 FAST – Ultra-Rapid Setting Floor Screed

When project deadlines are tight, SLC 3015 FAST provides an ultra-fast flooring solution. This advanced self-levelling screed features FiberFlex™ reinforcement technology, delivering outstanding strength and durability in high-traffic environments.

The rapid-setting formula allows light foot traffic after just 30 minutes, while floor coverings can be installed in as little as one hour. Suitable for applications up to 15mm thick, SLC 3015 FAST combines speed with performance, making it ideal for both commercial and domestic flooring projects.

Its compatibility with underfloor heating systems further enhances its versatility across a wide range of floor preparation applications.

LLC 200 – Professional Two-Part Latex Floor Leveller

LLC 200 is a modern two-part latex screed engineered to provide superior flow, smooth application, and excellent levelling performance. Designed for professional flooring contractors, this latex levelling compound can be applied up to 10mm thick and is moisture tolerant once installed.

The product accepts foot traffic within 2–3 hours and can be used to prepare a variety of rigid substrates, including concrete, sand/cement screeds, flooring-grade asphalt, and suitably prepared timber floors.

Featuring protein-free technology and reduced-carbon credentials, LLC 200 is suitable for environmentally conscious projects, underfloor heating systems, and biologically sensitive environments.

Lartex NA – Ultimate Latex Levelling Compound

For demanding flooring applications, Lartex NA delivers outstanding flexibility, adhesion, and moisture tolerance. This high-performance two-part latex floor screed is formulated to provide exceptional flow and rapid setting characteristics.

Suitable for applications up to 10mm deep, Lartex NA can typically withstand foot traffic within 1–2 hours, helping to minimise downtime on site. One of its key advantages is its ability to bond to many substrates and existing adhesive residues without the need for extensive priming.

Its combination of flexibility, strong adhesion, and compatibility with underfloor heating systems makes Lartex NA an excellent choice for both renovation and new-build flooring projects.

Finding the Right Floor Levelling Solution

Every flooring project presents different challenges, from uneven concrete substrates to timber floors and underfloor heating installations. Choosing the correct self-levelling compound or latex screed can significantly improve installation efficiency and long-term floor performance.

Whether you require a deep-fill renovation screed, a fast-setting floor leveller, or a flexible latex flooring compound, our Larsen's comprehensive range offers reliable solutions for residential, commercial, and industrial flooring applications.