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ARTA LECA
Leca Fill 3–10
Fill & screed grades

Leca Fill 3–10

Product code ALF-0310

The standard grade for roof screeds and void filling.

3–10 mm at 380–450 kg/m³, laid dry or bound with a cement slurry.

Grain size
3–10 mm
Loose bulk density
380–450 kg/m³

Description

For roof falls, filling between joists and floating floor build-ups. Laid dry it goes down fast and takes light traffic the same day.

Documents for this grade

Packaging & shipping

  • Bulk tipper 60–90 m³
  • Big bag 1 m³
  • Sack 50 L

Standards

  • EN 13055-1

Technical data

Technical data — Leca Fill 3–10
Grain size 3–10 mm
Loose bulk density 380–450 kg/m³
Particle density 750 kg/m³
Crushing resistance 1.9 MPa
Thermal conductivity 0.105 W/m·K
Water absorption (24 h) 15 %
pH 7.6
Fire resistance 1150 °C

Values published in datasheets are typical production values within the stated tolerance band. They do not replace engineering design, mix-design trials, or the requirements of a project specification.

Applications

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Applications

Roof screeds & floor build-ups

Lightweight falls that double as a continuous insulation layer, without loading the slab.

A conventional pumice or site-mixed lightweight screed weighs 800–1,200 kg/m³. The same build-up in expanded clay weighs around 400.

Over a large roof that difference amounts to tens of tonnes of dead load removed, while producing a continuous layer of thermal insulation — no joints, no thermal bridges — across the slab.

Engineering benefits

  • About a third of the weight of a conventional screed
  • Continuous insulation with no thermal bridging
  • Dry laid and fast, with no curing time
  • Non-combustible and moisture-stable
Thermal insulation

Thermal insulation

A mineral, non-combustible insulant with no performance loss over the building's life.

Applications

Thermal insulation

A mineral, non-combustible insulant with no performance loss over the building's life.

Organic insulants lose performance with time and moisture, and add fire load in a blaze. Expanded clay does neither: fully mineral, Euroclass A1 reaction to fire, stable to about 1,150 °C.

Typical uses: filling cavity walls, insulating ground-bearing floors, packing around buried heating pipes, and lining industrial kilns and flues.

Engineering benefits

  • Thermal conductivity around 0.09–0.11 W/m·K
  • Non-combustible, Euroclass A1
  • No performance loss from moisture or age
  • Resistant to rodents and insects

Related grades

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Leca Fill 0–3

Fill & screed grades

Leca Fill 0–3

The fine fraction for lightweight blocks, mortars and floor screeds.

Grain size
0–3 mm
Loose bulk density
550–650 kg/m³

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