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Casufloor C25/F5 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. Casufloor C25/F5 is designed for application at thicknesses of between 20 and 90 mm. Casufloor C25/F5 Alpha Hemihydrate Screed complies with EN 13813: 2002 and is CE marked.


  • Smooth laitance free finish.
  • Pumpable.
  • Under floor heating – full encapsulation.
  • Suitable for underlayment in wet areas.
  • Reduced drying times.
  • CE marked.
  • EN 13813: 2002.


CASEA Casufloor C25/F5 Alpha Hemihydrate 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) or as a floating floor and is particularly suited in conjunction with underfloor heating or cavity floors. It 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.

Related literature

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Standard product features

Technical characteristics (to EN 13813: 2002):

  • 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): C25.
  • Flexural strength (28 days): F5.
  • Tensile adhesion: > 1.5 N/mm².
  • Shrinkage (28 days): < 0.1%.
  • Hardening time (before foot traffic): 8–12 hours.
  • Recommend water content: 15–18%.
  • Reaction to fire: A1 non-combustible.
  • Thermal conductivity: 1.6 W/mK.
  • Modulus Of Elasticity: Approx. 18 kN/mm².
  • Delivery: Approx 550 l/t, approx 12.5 m² @ 40 mm, approx 22 l liquid screed per 40kg bag.
  • Water Demand: 7-8 l per 40 kg bag.
  • Consumption: Approx. 18 kg/m2 each 1 cm.

NBS Specification

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

NBS Specification

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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

CASEA Casufloor C25/F5

Manufacturer details

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