SMET LiteFlo® Lightweight Flowing Floor Screed


Our unique German-made, factory-produced, pumpable, superior-quality LiteFlo® Alpha Hemihydrate screed is based on calcium sulphate and selected lightweight aggregates.

LiteFlo® Lightweight Flowing Screed is designed for application at thicknesses of between 20 and 90 mm and is particularly suitable for application over timber suspended floors, timer-frame houses, and in high-rise buildings and apartment blocks.

LiteFlo® is suitable for floors in homes, offices, public buildings, and places exposed to similar loads. LiteFlo® may be applied as a levelling screed directly onto a load-bearing floor, unbonded on a separating barrier (polyethene), as a floating floor and can be used in conjunction with underfloor heating or cavity floors. However, when using LiteFlo® in combination with underfloor heating, it should be noted that LiteFlo® has a low thermal conductivity.

LiteFlo® should be covered with a floor finish such as tiles, linoleum, parquet, cork, or carpet. If a cement-based adhesive or smoothing compound is required the surface of the screed must first be sealed, using an appropriate acrylic primer/sealer.

SMET LiteFlo® is unique, in that it’s the first pumpable lightweight flowing screed available.  It’s made from specially selected aggregates, which makes it 30% lighter than conventional flowing screeds and 70% lighter than sand and cement, meaning less material is required per m2. 

LiteFlo® complies with EN 13813: 2002, is CE-marked and is available in 27Kg bags or bulk silos.

Benefits of SMET LiteFlo® Lightweight Flowing Floor Screed

  • Pumpable – first of its kind available.
  • Lightweight – high yield, 43kg per m2 at 40mm thickness.
  • 30% weight reduction compared to standard calcium sulphate screeds.
  • 70% weight reduction compared to traditional sand and cement.
  • Absolutely ideal for application in high-rise buildings, over timber suspended floors, timber-frame houses and in new builds and renovations.
  • Smooth laitance-free finish.
  • For application at thicknesses of between 20 and 90mm.
  • Under Floor Heating – full encapsulation.
  • Perfectly level floors – every time.
  • Installed nationwide by Smet Supported Partners.
  • Sustainable – as this calcium Sulphate binder naturally embodies less carbon than a cement-based binder.
  • German made.
  • CE EN 13813: 2002

Related Downloads


TDS SMET LiteFlo® Lightweight Flowing Screed


Aftercare SMET LiteFlo® Lightweight Flowing Screed


EPD – LiteFlo® Lightweight Flowing Screed


SMET Floor Screed and Compounds Product Selector

NBSplus National Building Specification Clause

Technical Details for SMET LiteFlo® Lightweight Flowing Floor Screed

Screed Specification EN 13813: 2002
Maximum Thickness 90mm
Minimum Thickness

Bonded: 20mm

Unbonded: 30mm

Domestic: 35mm

Commercial: 40mm

Over Underfloor heating Pipes: 25mm (BS 8204-7)

Use (External Use) No
Use (Internal Use) Yes
Compressive Strength (28 days) ≥ 20.0 N/mm²
Flexural Strength (28 days) ≥ 4.0 N/mm²
Tensile Adhesion > 1.5 N/mm²
Yield  1.08 kg/mm/m²
Flow Rate 240 – 260mm (slump flow – Hägermann cone)
Hardening Time (light foot traffic) after approx.12 hours, can be partially loaded after approx. 7 days
Hardening Time (final covering) Final Covering: 2 – 6 weeks dependent on thickness and drying conditions
Recommend water content 9 – 10 L water per 27kg bag
Working Life 45  – 60 minutes depending on ambient conditions
Reaction To Fire A1 Non-Combustible
Thermal Conductivity (tabular value) λR = 0.40 W/mK
Yield 1.08 kg/mm/m²
Fresh (Wet) Density 1.5 kg/l
Hardened Dry Density 1.3 kg/m³
pH Value > 7.0

SMET LiteFlo® is supplied to sites in convenient 27 kg pre-mixed bags or in bulk site silos.  We have a good range of SMET lightweight screed, systems, and aggregates (void fillers) suitable for any building project.

Check out this short video we made on-site at the GWQ Tower in London – a good demo of the mixing set up and equipment used when using the 27kg bags pumped to high-rise: