Floor screed is a cement-based layer, usually made from sharp sand and cement, that is installed over a structural subfloor. Sometimes fibres or special additives are added to improve strength and durability. The purpose of screed is to produce a smooth, level surface ready for final floor finishes such as tiles, wood, vinyl, or carpet. In some modern interiors and commercial spaces, screed itself can even be used as the finished surface when polished or sealed. In simple terms, screed helps remove dips and uneven areas in the concrete slab beneath.
What floor screed is used for
Levelling uneven floors
Screed helps correct low spots and uneven slabs, creating a flat base that prevents problems such as cracked tiles or uneven flooring.
Creating a stable base for floor coverings
By forming a strong and consistent surface, screed supports the final flooring and helps prevent movement, lifting, or cracking.
Encasing underfloor heating (UFH)
Screed is poured over heating pipes or cables so heat spreads evenly through the floor. Liquid screed is particularly effective because it fully surrounds the pipes and transfers heat efficiently.
Improving insulation and sound reduction
Floating screeds can be installed over insulation or damp-proof membranes, helping improve thermal performance and reduce sound transmission in line with UK building regulations.
Durable or decorative finishes
Certain screeds are designed for heavy use in warehouses or workshops, while polished screed floors can provide a modern decorative finish.
Common screed types
Traditional sand and cement screed
A widely used option that is hand applied and highly versatile, though it can take longer to dry.
Liquid screed
A pump-applied flowing screed that levels itself, ideal for large areas and underfloor heating systems.
Self-levelling screed
A polymer-modified compound designed for thin smoothing layers before floor coverings are installed.
Why it matters
Good quality screeding protects your finished floor and helps ensure compliance with British Standards such as BS 8204. With more than 15 years of experience, Floor Screeding London provides reliable screeding services across London with clear advice and straightforward quotations. Contact us today!