Yes, self-levelling concrete can usually be poured over an existing concrete floor if the base remains stable and undamaged. This flowing screed contains polymers that allow it to spread easily across the floor, filling uneven areas before setting into a smooth surface. It provides an excellent base for floor coverings such as tiles, vinyl, laminate, or engineered wood. Because the compound can be installed in very thin layers, it often removes the need to break out the original concrete slab. When used in suitable conditions, it is durable, efficient, and can also improve heat transfer in floors with underfloor heating.
When it’s a good idea (and when it isn’t)
Levelling compounds work best where the existing slab is largely intact but slightly uneven. Small cracks, shallow dips, and worn areas can often be corrected with a levelling layer.
These compounds may also be applied over stable materials such as tiles or plywood when the surface is properly prepared.
However, it is not suitable for covering structural damage. Major cracking, movement, subsidence, or persistent damp should be resolved before any levelling screed is applied. Floor Screeding Essex carries out site inspections and will recommend the most appropriate solution.
Preparation (this is what makes it last)
A successful installation relies on careful preparation.
- Remove dirt, grease, paint, and adhesive residues.
- Repair cracks and damaged areas.
- Grind or scarify smooth concrete to improve bonding.
- Vacuum the surface and apply primer.
Application basics
Self-levelling compounds are usually mixed from 20–25kg bags before being poured onto the floor. Installers spread the material using a gauge rake and then pass a spiked roller across the surface to release trapped air.
Typical thickness ranges between 2–5mm. Most products allow light foot traffic within 24–48 hours before final flooring is installed.
Cost and next steps
For small DIY projects, materials may cost a few hundred pounds. Professional installation costs vary depending on the project, though basic levelling labour often falls around £10–£12 per m².
Floor Screeding Essex provides clear surveys and competitive quotations for projects across Essex.