Floor concrete LB 7

Product description

Fescon LB 7 is a chemically drying floor concrete with a special cement binder for dry, humid and wet areas.

 

  • For layer thicknesses 10-150 mm
  • Very easy to pump
  • A surface that can be waterproofed in one work stage
  • Can be coated after 3–7 days
  • Rapid drying and strengthening
  • Good workability properties, also when spreading manually
  • Fibre-reinforced

Applications

  • Floor concrete LB 7 is mixed at ground level and pumped to where it is needed
  • No problems with dust or splashes at the work site. No more sacks at the site to disturb other work stages
  • Floor casting in new construction and renovation, when the structure must be ready quickly
  • Concrete floor casting, filling, levelling and grading indoors (dry and wet rooms)
  • Suitable for filling chases indoor, because it dries quickly
  • A surface that can be waterproofed in one work stage
  • Floors with underfloor heating
  • Can be used in floating, reinforced floors (e.g. 150/5 mm). The minimum thickness is 50 mm in such cases
The product is suitable for use on sites with a Nordic Swan Ecolabel.

Vinkki! Vieritä taulukkoa sivuttain
EAN code Product name Product number Package size
6416841202154 FLOOR CONCRETE LB 7 20215 20 kg
6416841333407 FLOOR CONCRETE LB 7 33340 1000 kg

Instructions

 
 
Base
  • Clean, solid and dust-free
  • Sufficient strength, load-bearing capacity and immobility
  • Relative humidity < 95 % RH
  • Temperature > +10 oC
  • Loose layers, cement paste and other impurities must be mechanically removed
  • For thin layers, we recommend brushing the product on the base for surface casting
Priming
  • In floor surface casting, carry out the priming in accordance with Fescon Adhesive Primer instructions, depending on the base
  • When beginning casting work, there must be no puddles of primer
Instructions for use
  • The work area must be completely protected from wind, draft, sun and rain.
  • When working on the floor, the indoor temperature must be +10…+25 °C and the indoor relative humidity more than 40%
  • A sack (20 kg) of floor concrete is mixed with 2.5–3.0 litres of cold water. When pumping the concrete, measure the amount of water using the flow device provided by Fescon. Lift the plate 15 times, after which the flow must be between 180 and 200 mm.
  • You must not exceed the amount of water, because it weakens the floor concrete’s strength properties, increases the risk of bleeding and extends the drying period.
  • Floor concrete is mixed into an even paste.
  • Floor concrete is spread with a pump or manually on the substrate, the compacted and levelled with a straightedge. The surface of the cast is ground, if necessary, to reach the necessary quality (such as using a polyurethane grinder and/or a steel trowel.
  • Workable for about one hour after adding water.
  • When finished working, wash the tools immediately with water.
  • Any dried filler is removed mechanically
  • If cement paste has separated into the floor concrete surface during grinding, the surface must be ground with a diamond grinding wheel before waterproofing.
Flooring
  • Floor concrete LB 7 can be waterproofed immediately with Fescon waterproofing products.
  • It may be coated with ceramic tiles, plastic coating, textile carpets, vinyl tiles, board parquet/laminate or cork. If necessary, the surface is ground and/or filled over with Fescon fillers, such as Fescorapid or FlowPlan.
  • It can be also painted over or covered with epoxy. You must nevertheless ensure that the technical properties of the mass fulfils the coating manufacturer’s requirements concerning the substrate.
  • In wet rooms, certified Fescon waterproofing products must be used. Waterproofable after approx. 3–7 weeks (+ 20 °C, relative humidity 50%)
  • The need for any curing must be assessed case by case, depending on the purpose of use and drying conditions.
  • Curing can be effected by means of a plastic membrane or a Fescon curing compound. No water may be added.
  • Floor concrete may not be left without coating for more than three months as it may crack and break off.
  • Check the humidity of the entire floor structure before installing any coating.
  • In order for floor concrete to dry well, the relative humidity of indoor air must be less than 50% and the temperature more than 20 °C. Poor conditions slow down the development of floor concrete’s strength properties and extend the drying period.
  • You must nevertheless ensure that the plaster’s technical properties meet the requirements set by the floor coating manufacturer and RYL, taking into account the entire structure. - The straightness of the finishing plaster is measured, if necessary, under RT guideline 14-11039.
Other considerations
  • The recommended layer thickness is 30–150 mm. Locally, such as around floor drains, the thickness may be 10 mm.
  • We recommend that you do not cast an area of more than 15 m2 at a time. If casting areas larger than 15 m2, the risk for cracks is higher, and the floor structure must be designed to factor in enough shrinkage, according to BY45/BLY 7 Betonilattiat 2014 (Concrete floors). The maximum area of finished flooring to be cast at the same time is approx. 50–100 m2.
  • When casting extensive finished flooring to the substrate, the tensile strength of the underlying concrete must be greater than 1.5 MPa. When dimensioning the surface tile, adhesion to the substrate is a key factor in preventing the tiles from becoming loose owing to shrinkage.
  • We recommend Cura-201 plaster pump or similar. 

 

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

approx 1.8 kg/m2/mm

Water requirement 2,5 - 3.0 l/20 kg
Type powder
Colour grey
Maximum grain size

3 mm

Package size 20 kg
Storage

storage time in a dry location approx. 1 year

Layer thickness

10-150 mm

Fibre Plastic fibre
Lowest usage temperature

+ 10°C

Workability time > 1 h
Coatable 7 days (temperature +20 °C and humidity 50% RH)
Walkable approx. 1 day
Compressive strength

28 days approx. 40 MPa

Adhesion strength

28 days > 1.0 MPa

Flexural bond strength 28 days approx. 4,0 MPa
Waterproofness

waterproof

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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