Gypsol XS High Strength Anhydrite Screed

Gypsol XS High Strength Anhydrite Screed

LKAB Minerals

Heavy duty flowing self compacting floor screed suitable for bonded, unbonded or floating aplications with or without underfloor heating. For use where heavier loadings are encountered.

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Gypsol XS self-compacting flowing screed is made to exacting standards by quality assured manufacturers to BS EN 13813. It is a combination of high quality Gypsol binder, specially selected sands, water and special additives where required. It is an enhanced strength mix design which offers a minimum CA-C35-F7.

Gypsol XS high strength anhydrite screed is suitable for the encapsulation of an underfloor heating system, either electric or warm water. Gypsol XS is suitable for use in both residential and commercial including apartments, schools, prisons, hospitals and single dwellings where higher loadings and more durable screeded floors are required. In common with all screeds, Gypsol XS screed also improves the environmental characteristics of the floor.

General information


High-strength, suitable for underfloor heating, ergonomically friendly installation, protein free

Uniclass 2015

Pr_35_31_06_72 Ready-mixed self-smoothing calcium sulfate screedsPrimary


M13/120 Proprietary self smoothing levelling screeds

Specification data - Ready-mixed self-smoothing calcium sulfate screeds

Product Reference

Gypsol XS High Strength Anhydrite Screed

Standard product features

Physical properties:

  • Appearance: Off white fluid mortar.
  • Density: Wet – 2200 kg/m³, dry – 2000 kg/m³.
  • Minimum strength (28 days): CA-C30-F7.
  • Required flow (to BS EN 13454-2): 230–270 mm.
  • Drying time (to <75% relative humidity (RH) at 50 mm depth): Natural drying 28 days; forced drying 13 days. Can take foot traffic 24–48 hours and loading 5–7 days (based on good drying conditions of 60% RH at 20ºC).
  • Fire rating: Class A1fl.

Application (minimum depth):

  • Bonded: 25 mm.
  • Unbonded: 30 mm.
  • Floating: 35mm domestic, 40 mm commercial.
  • Acoustic: 80kg at 40 mm.
  • Cover to conduits: 25 mm.

Gypsol screeds are suitable for use on most substrate types.


  • Recycled content: Binder – 98%, mortar – up to 40%.
  • Carbon emissions: Binder – 10–20 kg/tonne, mortar – 20–40 kg/m³.
  • VOC: Zero.
  • Recyclability: 100%.

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