Cemfloor Screed London — Cement Liquid Screed

What is Cemfloor screed?

Cemfloor is a cement-based liquid flow screed manufactured by Aggregate Industries and certified to EN 13813 — the European standard for screed materials. It achieves a compressive strength class of CT-C25 and flexural strength class of F5, making it one of the strongest liquid screeds available. Its binder is Portland cement, combined with selected aggregates, performance additives, and clean water to produce a fully pumpable, self-levelling, self-compacting mix.

Unlike traditional sand-cement screed, Cemfloor pours like a liquid, eliminates the manual compaction and tamping required by conventional methods, and produces a consistently flat, smooth surface. It is supplied ready-mixed and installed on site by our pump crews — see our preparation guide for what we need ready before pour day.

Where should Cemfloor screed be used?

Cemfloor is the correct choice wherever anhydrite screed cannot be used. Because it is cement-based rather than calcium sulphate based, it is not susceptible to moisture degradation. This makes it the specified product for bathrooms, wet rooms, commercial kitchens, plant rooms, basements below DPC, and any external covered area. It can be fully waterproofed with a tanking membrane or liquid waterproofing system applied to the cured surface.

In contrast, anhydrite (calcium sulphate) screed excels on large, dry internal floor areas — open-plan commercial floors, warehouse slabs, and domestic ground floors away from moisture risk. Where in doubt, specify Cemfloor: it performs in both wet and dry conditions, whereas anhydrite is limited to dry environments only.

• Bathrooms, wet rooms, en-suites
• Commercial kitchens and food preparation areas
• Basements and below-ground slabs
• External covered areas and covered balconies
• Any application where calcium sulphate screeds are unsuitable

How fast does Cemfloor screed dry?

Under ideal conditions — ambient temperature 15–20°C, relative humidity around 50%, good airflow — Cemfloor dries at approximately 1mm per day. A 50mm pour will therefore reach floor-covering readiness in approximately 50 days under natural drying. Force-drying using dehumidifiers can begin from day 7 after pour, significantly accelerating the programme on time-critical projects.

Light foot traffic is typically possible within 24–48 hours. Follow-on trades such as partition builders and plumbers can usually access the floor within 48–72 hours. For full drying guidance including how to test readiness with a calibrated hygrometer, see our drying times page. Floor coverings must not be applied until the screed reaches a relative humidity of 75% or below (65% for timber flooring).

Is Cemfloor compatible with underfloor heating?

Yes — Cemfloor is fully compatible with wet underfloor heating systems and follows the same commissioning protocol as anhydrite screed. The recommended installation depth over UFH pipework is 40–50mm, ensuring complete encapsulation of the pipes with no air pockets, which maximises thermal conductivity and heat output efficiency.

Cemfloor's cement-based composition provides excellent thermal mass, storing heat effectively and distributing it evenly across the floor surface. The screed must be allowed to cure fully before the UFH system is commissioned — typically a minimum of 21 days before beginning the gradual heat-up cycle. See our underfloor heating guide for the full commissioning protocol.

How does Cemfloor compare to anhydrite screed?

Both are self-levelling liquid flow screeds installed by pump, and both dramatically outperform traditional sand-cement in installation speed and flatness. The critical difference is the binder — and that determines where each product can be used.

Anhydrite screed uses calcium sulphate as its binder. It is generally lower in cost, can cover larger areas per day (up to 2,000m² with multiple pumps), and is the default choice for large dry internal floor areas. It cannot be used in wet rooms, bathrooms, or any area with permanent moisture contact.

Cemfloor screed uses Portland cement. It costs slightly more per m², but has no moisture restrictions, achieves C25/F5 strength, and can be waterproofed. Installation speed is comparable for standard residential and commercial projects. It is the correct specification wherever moisture is present or anhydrite is unsuitable.

Both products are underfloor heating compatible and EN 13813 certified. For a detailed side-by-side comparison, see our anhydrite screed page.

Which Cemfloor screed is right for your project?

Every grade we lay is a pump-applied cement screed — delivered by mixer truck and pumped straight into place, which is our standard model. Because Cemfloor is cement-based it leaves no surface laitance, so there is no sanding or depriming before floor finishes and it tiles with standard cement-based adhesives. We install the full pumpable Cemfloor range and specify the right grade to the programme and the loading:

• Standard Cemfloor — the everyday grade for typical domestic and commercial floors.
• Cemfloor Therm — engineered for underfloor heating. The highest thermal conductivity in the range, it flows fully around the pipes with no air gaps and cures with minimal drying shrinkage (<0.05%), so the heated floor stays stable.
• Cemfloor Level Plus — a thin-section grade that pumps from 12–15mm, for projects where build-up height is fixed by door thresholds, existing joinery or overlay levels.
• Cemfloor Durafibre — reinforced with glass microfibres for impact and crack resistance, for high-traffic and heavily loaded floors.
• Cemfloor Fastrack — a fast-track grade for programme-critical projects where the follow-on trades cannot wait.
• Cemfloor NH — a free-flowing, general-purpose grade that takes light foot traffic in 24–48 hours.
• Cemfloor HPC — a high-performance grade for large commercial slabs that need extra strength and wider bay sizes.

Not sure which grade your floor needs? Tell us the build-up, the loading and whether underfloor heating is involved and we will specify it — as the South East’s Cemfloor specialists, that is what we do on every enquiry.

What are the technical specifications of Cemfloor screed?

Cemfloor is manufactured by Aggregate Industries and certified to EN 13813. Key technical data:

• Binder: Portland cement (CT designation)
• Compressive strength class: C25
• Flexural strength class: F5
• Application depth: 30–80mm (standard range; consult data sheet for specific build-ups)
• Coverage: Approximately 130kg/m² at 50mm depth
• Light foot traffic: 24–48 hours after pour
• Force-drying: From day 7 using dehumidifiers
• Drying rate: Approximately 1mm/day under ideal conditions
• Thermal conductivity: Suitable for underfloor heating at 40–50mm over pipework
• Standard: EN 13813 (CT-C25-F5)

For the full product data sheet, structural calculations, and BBA certification details, visit our technical data page.

For typical Cemfloor screed pricing across London, see our liquid screed cost guide.

Get a free Cemfloor screed quote in London

London Flow Screed installs Cemfloor screed across Greater London and the surrounding counties. Whether you are specifying for a single bathroom or a multi-storey commercial project, our crews have the equipment and experience to deliver a flat, strong, correctly dosed pour on schedule.

Call us on 07730 584 748 or use our contact form for a free, no-obligation quote. We will beat any like-for-like written quotation. Most quotes are turned around within 24 hours.