Home > Companies > SMET Building Products Ltd > SMET LiteFlo® Lightweight Flowing Screed

SMET LiteFlo® Lightweight Alpha Hemihydrate Screed is a factory produced, pumpable, high-quality screed material based on calcium sulfate. It is supplied to site in pre-mixed bags or site silos. LiteFlo® is designed for application at thicknesses of 20–90 mm. LiteFlo® complies with BS EN 13813 and is CE marked.


  • Lightweight - high yield, 43kg per m2 @ 40 mm.
  • 30% weight reduction compared to normal CA screed.
  • Ideal for application in high-rise buildings and over timber suspended floors.
  • Smooth Laitance Free Finish.
  • Pumpable.
  • Full Encapsulation of pipes and services.
  • CE Marked.
  • EN 13813: 2002.


SMET LiteFlo® Lightweight Flowing Screed is suitable for floors in homes, offices, public buildings and places exposed to similar loads. It may be applied as a levelling screed directly onto a load bearing floor, unbonded on a separating barrier (polythene), as a floating floor and is suited 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.

Standard product features

Technical characteristics:

  • Maximum thickness: 90 mm.
  • Minimum thickness: Bonded, 20 mm. Unbonded, 30 mm. Domestic, 35 mm. Commercial, 40 mm. Over underfloor heating pipes: 25 mm (BS 8204-7).
  • Use: Internal.
  • Compressive strength (28 days): C20.
  • Flexural strength (28 days): F4.
  • Tensile adhesion: > 1.5 N/mm².
  • Shrinkage (28 days): < 0.1%.
  • Hardening time (before foot traffic): 6–8 hours.
  • Hardening time (final covering): 2–6 weeks dependent on thick­ness and drying conditions.
  • Recommend water content: 9-10 L per 27 kg bag.
  • Reaction to fire: A1 non-combustible.
  • Thermal conductivity: < 0.40 W/mK.
  • Yield: 1.08 kg/mm/m².
  • Fresh (wet) density: 1,500 kg/m³.
  • Hardened dry density: 1,300 kg/m³.
  • pH value: > 7.0.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-10/325 Self-smoothing calcium sulfate screeds (ready mixed)

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



SMET Building Products Ltd


+44 (0)28 30266833

Product reference

SMET LiteFlo® Lightweight Flowing Screed

Manufacturer details

93A Belfast Road,
Co Down, BT34 1QH
Tel +44 (0)28 30266833
Fax +44 (0)28 30267619
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