Product description

Fescon FlowBase is a low-alkali (pH < 11), easy-to-level, fast setting, pump-applied levelling compound with a special cement binder and with high tensile and strength properties as well as having excellent workability characteristics and strength values.


  • For layer thicknesses 2-  30 mm (partial levelling max. 50 mm)
  • High strength properties
  • Easy to level
  • Can be pump-applied and manually levelled
  • For underfloor structure of coatings


  • Levelling of hollow slabs and concrete floors in flats, business premises, hospitals, offices and schools.
  • Levelling of hollow slabs and concrete floors at site where high strength properties are required.
  • Suitable for the base of coatings (epoxy, acrylic, or paint) requiring high strength with a layer thickness exceeding 3 mm.
  • For the base of a glue-down wooden floor.
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
6416841331489 FlowBase 1000 kg 33148 1000 kg


  • Concrete and hollow slab bases
  • The base is clean, solid, dust-free, and vacuum-cleaned
  • Loose layers, cement paste, and other impurities have been mechanically removed to ensure adhesion between the floor levelling compound and base
  • The base must be sufficiently strong and immobile, and have a sufficient load-bearing capacity
  • The tensile strength of the base must be > 1.5 MPa
  • The temperature of the underfloor structure is > +10 °C and relative humidity < 95% RH The relative humidity of the underfloor structure affects the setting of the floor levelling compound
  • If need be, any rough areas are filled by Fescon LM 5000 or Flow HS before the floor levelling compound is applied
  • Possible leakage areas are sealed with putty
  • Priming is performed according to the instructions of Fescon Adhesive Primer or Flow Primer, depending on the base
  • Priming of non-absorbing surfaces (such as ceramic tiles, epoxy, metal surfaces) according to the instructions of Primer PLUS
Instructions for use
  • The workspace must be protected all over against wind, draught, sun, and rain
  • When pumping, the minimum layer thickness must be checked with the floor work contractor
  • During floor work, the indoor temperature has to be +10…+25 °C, and the relative humidity of the indoor air > 40 % RH
  • Mix a bag (20 kg) of the levelling compound in 3.8-4.2 litres of cold water
  • Do not use more water than instructed, because it will reduce the strength values of the floor levelling compound, increases the risk of separation, and adds to the setting time of the floor levelling compound
  • The levelling compound is mixed to a consistent paste with a drill paddle, or if pumped, with an automated or pipe mixer.
  • Apply the levelling compound with a steel trowel or pump onto the surface being levelled
  • Workable for about half an hour after adding water
  • Wash tools with water immediately after completing the work
  • Remove dried levelling compound mechanically
  • Make sure ventilation is adequate after finishing the floor levelling compound work.
  • If need be, the setting of the floor levelling compound can be accelerated by grinding the surface because this reduces the resistance of water vapour in the surface of the floor levelling compound
  • The setting times are greatly affected by the conditions at the work site, ventilation, and the amount of water used in the floor levelling compounds
  • Pumping from a tanker lorry is not recommended < -25°C
  • The floor load capacity is estimated work site specifically with the floor levelling contractor
  • Can be coated with ceramic tiles, plastic coatings, textile mats, vinyl tiles, wood parquet or laminate, and cork. If necessary, overlaying by Fescon manually-applicable levelling compounds, such as FlowPlan
  • Also suitable as the base of a glue-down wooden floor
  • A layer exceeding 3 mm can be paint or epoxy coated
  • The levelling compound hardens fast and chemically binds the water amount according to the instructions
  • However, it must be ensured that the levelling compound, concerning its technical properties, meets the requirements of the manufacturer of the floor covering and RYL for bases to be covered, with the entire structure in mind. The straightness of the levelled surface is measured according to the RT instruction 14-11039, if necessary.
  • Once the floor levelling compound has reached the degree of dryness required by the covering, the floor is covered or aftercare commenced
  • The floor levelling compound must not be left uncovered for more than 3 months due to the risk of it cracking or detaching
  • In conditions with an RH of less than 40%, special attention should be paid to when to start the aftercare. The need for aftercare is assessed on a case-by-case basis. 
  • Check the humidity of the entire floor structure before installing a coating
  • Good setting properties for the floor levelling compound require that the indoor humidity is less than 50 % RH and the temperature is over 20 °C. Poor conditions slow down the development of the strength characteristics of floor levelling compounds and increase the setting time
  • Layer thicknesses of more than 30 mm prolong the setting time.
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

n. 1,7 kg/m²/1mm

Water requirement 3,8 - 4,2 l / 20 kg (Flow as measured by Fescon flow plate)
Type powder
Binder special cement
Colour grey
Maximum grain size

0,6 mm

Package size 20 kg, 1000 kg

storage time in a dry location approx. 10 months

Layer thickness

2-30 mm, (partial levelling max. 50 mm), when pumping the minimum layer thickness is 5-10 mm, depending on the pumping equipment.

Fibre non-fibre reinforced
Usage temperature

+ 10 °C - + 25 °C

Workability time approx. 0,5 h
Coatable approx.. 1-3 weeks (Rh 50% +20 °C) < 30 mm, > ayer thicknesses of 30 prolong the setting time
Walkable approx.. 3 h
Strength class C 30 (EN 13813)
Compressive strength

> 30 MPa (28 day +20 °C, RH 50 %)

Adhesion strength

> 1.5 MPa for concrete  (28 day +20 °C, RH 50 %)

Flexural bond strength F 7 (EN 13813)
Surface tensile strength > 1,5 MPa (28 vrk +20 °C, RH 50 %)
Frost resistance Non-frost resistant. For indoor spaces.
pH < 11 Low alkaline (hardened material).


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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