3i-Instalallation crumb filler for the lightweight concrete

An easy and inexpensive solution for a floor composition

The 3i-insulating loose crumb from the recycled polystyrene and cement. The crumb is mixed with the cement and water during the manual or mechanical production of the polystyrene bead aggregate concrete, which is intended for the non-load bearing and filling building structures and for the thermal insulating layers of the horizontal constructions. For the compaction the sand can be added. This filling is suitable for insulating or levelling of the floors, in the penthouses, attics, for the balcony and terrace floors.


  • Levelling and insulation layer for the ceilings and floors
  • Pitching insulating layer on the terraces, balconies
  • A pitch layer on the flat roofs
  • Insulation of water and sewerage systems

Features and benefits

  • Heat insulation
  • Laying on uneven and tapered surface
  • Simple and fast processing from +5°C
  • Walksafe after 24 hours
  • CCost-effective solution
  • Hygienic safety, suitable also for interiors

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Technical data

The final compound of lightweight concrete has the bulk density based on the amount of cement and water added

Crumb bulk density 200-300 kg/m3
10% deformation pressure strenght min. 150 KPa
Thermal conductivity λ = 0,065 - 0,085 W/mK
Height of the layer from 8 to 60 cm


  • Big-bag 1 m3 (1000 l )
  • PE bag 100 l

Mixing ratio

  • 1m3 of insulation crumb
  • 80-120 kg of cement according to the required strengt
  • 100 – 140 l of water


Add cement to water and mix into the cement milk. Gradually add the crumb and mix until a semi-dry homogeneous mixture is formed. If the mixture is too dry and cohesionless, add water. The resulting mixture must not be liquid. Thoroughly tighten a thicker layer, strike off the surface with the smoothing beam and smooth it with a trowel. It is necessary to protect the filling on the outdoor surfaces against excessive drying and weathering. The entire height of the layer must be laid on. It is necessary to count with the compaction of approx. 12%.

Examples of use

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e.g. Floor structure

  • Parquet 1,5 cm (wooden floor)
  • Screed 5 cm
  • 3i-lightweight concrete 20 cm
  • Reinforced concrete 20 cm
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e.g. Floor structure

  • Pavement 1,5 cm
  • Screed 7 cm with floor heating
  • 3i-lightweight concrete 20 cm
  • Reinforced concrete 20 cm
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e.g. Structure of the flat roof

  • Double-layer insulation
  • Screed 5 cm
  • 3i-lightweight concrete in 2,5% falling gradient
  • Reinforced concrete 20 cm
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