A well prepared subfloor is the foundation of every high quality flooring system. Whether you are installing tiles, vinyl, epoxy flooring, PU coating, carpet, hardwood, or decorative overlays, surface levelness plays a major role in durability, appearance, and long term performance. Uneven floors can lead to cracks, hollow sounds, delamination, premature wear, and installation failures.

This is where Self Levelling Compounds, also known as self levelling screeds or self smoothing underlayments, have become one of the most essential materials in modern flooring and construction. They help create a smooth, flat, and perfectly aligned base that meets the demanding requirements of both industrial and residential flooring systems.

In this full guide, you will learn what self levelling compounds are, how they work, why they matter, their benefits, application methods, and where they fit in the flooring industry. This blog also highlights how high performance self levelling systems from Royal Industries bring strength, consistency, and long term reliability to every project.

What Is a Self Levelling Compound?

A self levelling compound is a cement based, polymer enhanced floor underlayment that spreads evenly across the substrate to create a level, smooth surface. When poured, it flows easily, fills depressions, covers undulations, and settles into a flat profile without extensive trowelling.

These compounds are designed to be:

• Highly flowable
• Fast curing
• Crack resistant
• Dimensionally stable
• Easy to apply

Self levelling compounds are typically applied in thicknesses ranging from 2 mm to 50 mm depending on the product and substrate condition. They serve as a base layer for almost all types of flooring materials, especially in commercial and industrial environments.

How Does Self Levelling Compound Work?

The science behind self levelling systems lies in the combination of:

• Special cement grades
• High quality polymers
• Fine aggregates
• Flow modifiers
• Shrinkage reducing agents

When mixed with water, the polymer modified mortar becomes highly fluid. It spreads and levels itself through surface tension and controlled viscosity. Once cured, it forms a high strength, smooth and defect free substrate.

Self levelling compounds bond strongly to concrete and other subfloor materials, ensuring lasting performance under both static and dynamic loads.

Applications of Self Levelling Compound

Self levelling compounds are used in a wide range of projects:

Commercial and Industrial

• Warehouses
• Hospitals
• Malls
• Factories
• Hotels
• Office buildings

Residential

• Apartments
• Villas
• Renovation projects
• Bathrooms
• Kitchens

Specialty Flooring

• Epoxy floors
• PU floors
• Vinyl sheet flooring
• Carpet flooring
• Tile installations

Self levelling systems are especially important for areas where precision, flatness, and aesthetic perfection are required.

Benefits of Self Levelling Compounds

Self levelling compounds offer numerous advantages compared to traditional sand cement screeds.

1. High Flowability and Easy Application

The compound flows freely and settles evenly without intensive labour.

2. Fast Curing

Floor coverings can often be installed within 24 hours depending on the product.

3. Smooth and Seamless Finish

No cracks, bumps, or weak spots after proper application.

4. Perfect for Thin Layers

Ideal for areas where a thick screed is not possible.

5. High Compressive Strength

Most self levelling compounds offer strong load bearing performance.

6. Excellent Adhesion

Sticks firmly to concrete, old tiles, and certain primed surfaces.

7. Compatible with Many Flooring Types

Works perfectly under tiles, epoxy flooring, vinyl, carpet, and more.

Types of Self Levelling Compounds

There are several types based on application needs:

1. Standard Cement Based Self Levellers

Suitable for residential and light commercial areas.

2. Polymer Modified Self Levellers

Ideal for high performance floors requiring better strength and flexibility.

3. Fast Drying Self Levellers

Ready for floor installation within hours rather than days.

4. Industrial Grade Self Levellers

Designed to withstand heavy machinery and traffic.

5. Self Levelling Underlayments for Epoxy and PU Floors

Smooth and defect free surfaces without pinholes.

Why Self Levelling Compound Matters in Flooring Systems

A poor subfloor can ruin even the most expensive flooring system. Self levelling compounds help:

• Reduce long term flooring failures
• Prevent tile cracks or hollow patches
• Improve epoxy and PU coating uniformity
• Increase flooring lifespan
• Provide an even base for adhesives and coatings

In the flooring industry, levelling the surface is considered one of the most important steps of the entire installation process.

Royal Industries and Self Levelling Solutions

Royal Industries provides high performance cementitious flooring and repair materials engineered for durability and superior finish. Our self levelling compounds are designed for:

• Fast application
• High flow
• Low shrinkage
• Strong adhesion
• Smooth, flat, and durable floors

They are ideal for new construction as well as refurbishment projects in residential, commercial, and industrial sectors.

How to Apply Self Levelling Compound

Follow these steps for best results:

1. Surface Preparation

• Remove dust, debris, oil, or contaminants
• Repair cracks or damaged areas
• Ensure a solid substrate

2. Apply Primer

Priming enhances bonding and prevents rapid water loss.

3. Mixing

Mix powder with clean water using a mechanical mixer until lump free.

4. Pour and Spread

Pour the mixture on the floor and spread using a trowel or gauge rake.

5. Use a Spiked Roller

This helps release trapped air and ensures uniform levelling.

6. Allow to Cure

Protect the area from traffic until fully cured.

Common Mistakes to Avoid

• Mixing with too much water
• Skipping primer
• Applying over weak or dusty surfaces
• Trying to level extremely uneven floors in a single layer
• Working in direct sunlight or windy environments

Correct installation ensures long term performance.

Self Levelling Compound vs Traditional Screed

Self Levelling Compound

• High flow
• Fast setting
• Smooth finish
• Thin application
• Suitable for final flooring preparation

Traditional Screed

• Labour intensive
• Slow curing
• Requires skill to level manually
• Thicker layers

Both have their place, but self levelling compounds offer superior precision and speed.

Frequently Asked Questions

1. Can self levelling compound be used outdoors?

Yes, but only if the product is designed for exterior use. Check specifications.

2. Can tiles be fixed directly on self levelling compound?

Yes, once fully cured and compatible tile adhesive is selected.

3. How thick can self levelling compound be applied?

Typically 2 mm to 50 mm depending on the system.

4. Can self levelling compound go over old tiles?

Yes, if tiles are cleaned, primed, and firmly bonded.

5. Is primer mandatory?

Yes, primer is always recommended to ensure bonding and prevent pinholes.

Conclusion

Self levelling compounds have become essential in modern flooring systems. They offer fast, easy, and highly reliable solutions for creating smooth, level, and durable surfaces. Whether you are preparing floors for tiles, vinyl, epoxy, or PU coatings, self levelling systems help you achieve professional results with minimal effort.

Royal Industries continues to provide advanced, high strength self levelling solutions engineered for commercial, industrial, and residential environments. With superior flow, strength, and application ease, our self levelling compounds guarantee long lasting performance and a perfect foundation for any flooring finish.