Self-levelling concrete can often be poured over an existing concrete floor as long as the slab is stable and undamaged. This type of screed is a polymer-modified compound designed to flow across the surface and settle into low areas before hardening into a smooth finish. The result is a level base suitable for tiles, vinyl, laminate, or wood flooring. Because the material can be installed in thin layers, it often eliminates the need to remove the original slab. When installed properly, it provides a durable and efficient floor surface and can even improve heat transfer with underfloor heating.
When it’s a good idea (and when it isn’t)
Self-levelling overlays are ideal for floors that are structurally sound but slightly uneven. Minor cracks, shallow depressions, and worn surfaces can usually be corrected without replacing the concrete base.
The compound may also be installed over surfaces such as tile or plywood if they are secure and well prepared.
However, floors with structural movement, significant cracking, subsidence, or moisture problems should not be covered without proper repairs. Floor Screeding Surrey carries out site surveys to determine whether levelling, grinding, or deeper screeding is the most suitable approach.
Preparation (this is what makes it last)
Correct preparation ensures strong adhesion.
- Remove dust, grease, paint, and adhesive residues.
- Repair cracks, holes, or damaged sections.
- Roughen very smooth surfaces by grinding or scarifying.
- Apply a primer to seal the surface and improve bonding.
Application basics
Self-levelling compounds are usually mixed from 20–25kg bags and poured immediately after mixing. Installers guide the mixture across the floor using a gauge rake and then use a spiked roller to remove trapped air.
Typical application thickness ranges from 2–5mm. Many systems allow foot traffic within 24–48 hours and can receive floor finishes once fully cured.
Cost and next steps
Material costs for DIY work are relatively low, while professional installation costs vary depending on floor size. Labour costs for basic levelling often fall around £10–£12 per m².
Floor Screeding Surrey offers site surveys across Surrey, providing clear advice and competitive quotes.