Flow HS

Product description

Designed for low-strength and difficult bases, Fescon Flow HS is a fibre-reinforced, low-alkali (pH < 11), casein-free, pump-applied levelling compound with a special cement binding agent, that is easy to level and features excellent workability.


  • Easy to level
  • For layer thicknesses 8 - 50 mm (partial levelling 8-80 mm)
  • Dries through hydration
  • For floors with underfloor heating
  • Can be pump-applied


  • Suitable for levelling wooden floors, weak concrete floors, plasterboard floors, etc. in flats, offices, public buildings, schools, hospitals, and other such sites
  • Also suitable for solutions with floating floor structures
  • Tanker pumping is not recommended at temperatures < -25°C
The product is listed in the portal for building products that can be used in Nordic Swan Ecolabelled buildings.

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EAN code Product name Product number Package size
6416841202345 Flow HS 20 KG 20234 20 kg
6416841331427 Flow HS 1000KG 33142 1000 kg
Flow HS 33124 1 kg


  • Clean, solid and dust-free
  • Sufficient strength, load-bearing capacity and immobility
  • Relative humidity < 95% RH
  • Temperature > + 10 °C
  • Loose layers, cement paste and other impurities must be mechanically removed
  • If the adhesion strength of the base is < 0.5 MPa, the floor is constructed as a floating structure
  • Carry out the priming in accordance with Fescon Adhesive Primer instructions, depending on the base
  • The adhesive primer must be dry before levelling
Instructions for use
  • Mix a bag (20 kg) of the levelling compound in 4.0 litres of cold water
  • Do not use any more water because this decreases the surface strength
  • Mix the levelling compound carefully and long enough to make it a consistent paste
  • Apply the levelling compound with a steel trowel or pump it onto the levelled surface
  • Workable for about half an hour after adding water
  • Wash tools with water immediately after completing the work
  • When pumping, the relative humidity in the air must be >40%
  • Can be covered using ceramic tiles, plastic or textile mats, vinyl tiles, wood parquet or cork
  • The floor levelling compound (once it has dried) must not be left uncovered for a longer period than three months
After treatment
  • Once the base has dried sufficiently for the chosen flooring, the flooring is installed or the aftercare begun
  • In conditions with an RH of less than 40%, special attention should be paid to when to begin the aftercare
  • A floating structure should always be given aftercare within one day of the pumping

Floor heating with water circulation may be started after seven days from applying the floor levelling compound. The water temperature is first set to +20°C. The final water temperature may be applied after the floor covering is installed. Higher water temperatures cause a major decrease in the strength characteristics of the floor levelling compound and an increase of it cracking, so they must be avoided at all costs.

Waste handling

Storage and handling of waste. See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank

Technical information

Material usage

1 mm layer approx. 1.7 kg/m²

Water requirement 4.0 l/20 kg
Binder special cement
Colour grey
Maximum grain size

1.2 mm

Package size 20 kg, 1000 kg, bulk (kg)

storage time in a dry location approx. 12 months

Layer thickness

8 - 50 mm (partial levelling 8 - 80 mm)

Usage temperature

+ 10°C – + 25°C

Workability time app. 0,5 h
Coatable approx. 1-8 weeks (RH 50% + 20 °C)
Walkable approx. 4- 6 h
Strength class C 16 (EN 13813)
Compressive strength

> 16 MPa (28 days +20 °C, RH 50 %)

Flexural bond strength F 5 (EN 13813)
Surface tensile strength > 1,2 MPa (28 days)
Wear resistance

RWFC 550 (EN 13892-7)

The information is based on tests and practical experience. We cannot affect conditions at the work site so we cannot assume responsibility for the end result affected by local conditions.


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