GENERAL CATALOGUE 2007LIGHT EXPANDED CLAY,LIGHTWEIGHT PRE-MIXED,PRODUCTS FOR FOUNDATIONS,SCREEDS AND STRUCTURALCONCRETE

Expanded clay and premixed productsFrom the earth to fire, this is how Leca is created. Is a natu-ral, lightweight and insulating aggregate. “Light ExpandedClay Aggregate” consists of clay granules burned at 1200 °C,with thousands of internal air-cavities closed in a hard andresistant shell. The Leca product evolved to Lecapiù, the onlywater-repellent expanded clay, the base component of theentire range of lightweight and insulating pre-mixed prod-ucts for screeds, foundations and structural concrete.Is produced exclusively by Laterlite in Italy with patentedtechnologies, over 40 years of experience, 30 million cubicmeters produced, and 500 million square meters of materi-al supplied. From January 1, 2002 Laterlite and BuzziUnicem joined integrating activities regarding in the sectorof expanded clay and lightweight premixed materials.Laterlite operates with the Leca and Termolite brands.

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TECHNICAL GLOSSARY

LECA

LECAPIÙ

LECACEM CLASSIC

LECAMIX FAST

LECAMIX FORTE

LECAMIX FACILE

SISTEMA SOTTOFONDO

MASSETTOMIX PARIS

LECA CLS 1400 E 1400Ri

LECA CLS 1600

LECAMUR

SABBIA LECA

BITUMLECA

AGRILECA

REOLECA

LECA STRUCTURAL CONCRETE

LECASERVICE

CASTING EQUIPMENT

EC MARK ON PRODUCTS

CONVENTIONS AND TRAINING

INFORMATION AND WARNINGS

62

63

64

66

6

8

16

18

22

26

30

34

36

40

44

46

48

50

52

54

56

60

Premixed concrete for fast dry screeds

Premixed concrete for lightening structures and isolating

Water-proof Leca expanded clay

Leca, Leca Secco, Leca crushed, Leca Structural and Leca Terrecotte

Premixed concrete for single layer screeds and foundations

Premixed concrete for screeds, foundations and roofs

Premixed lightweight structural concrete

Premixed high resistance structural concrete

Thermall insulating mortar for walls

Lightweight aggregate for fire resistant plastering

Cold bituminous aggregate for road repairs

Expanded clay for gardens

Pumpable grout for foundations and roofs

Prepared in concrete mixing plants or for prefabrication

Casting on site service

Lecamix continuous mixers

for designers, retailers and Industries

Premixed fiber-reinforced material with high thermal con-ductivity

Certified solutions for lightweight foundations

Definition of foundations and lightweight concrete

Edition 2006© Laterlite - All rights reserved The reproduction, even partial, is forbidden.For updates that should become effective during the year, please visit the site www.laterlite.eu or refer to the Technical Sheets.For further information contact Laterlite Technical Assistance (tel. 02 48011962).

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GLOSSARY: DEFINITIONS AND TERMINOLOGY OF FOUNDATIONS

FOUNDATIONThe group of layers between the floor and the finishing flooringthat aim to divide the loads transferred from the flooring to thebearing structure, level out irregularities of the raw structure, coverand protect piping, contribute to thermally and acoustically isulatevarious living quarters. According to the function and the thick-ness, the foundation can be SINGLE-LAYER or MULTI-LAYER.

IMPACT SOUND INSULATION LAYERElastic mat able to absorb the vibrations transferred to the flooring bypunctual impacts in the floor. These noises travel through materialsand the harder the material the more the noise travels. That’s whyit is necessary to put an elastic “mat”, generally made of polyethylenefoam mesh, cork or mineral wool. In single-layer foundations theimpact sound insulation layer must be put under the screed. In multi-layer foundations it is generally between the screed and the iso-lation and/or lightening and/or compensation where all the instal-lations were laid. This solution is called a “floating floor”.As for the thickness of the screed, this must be considered verycarefully because it is laid on an absorbing layer (see Table 2 page66). Sometimes the impact sound insulation layer can also act asa dump proof (photo 2)

DAMP-PROOFA water-proof and damp-proof layer that prevents both theabsorption of water from the screed in case of very dry supports,and the humidity from rising from the wet underlying layers up tothe flooring. It is used to protect the layers of the flooring sensitiveto humidity (eg. wood flooring). It could be created using bitumi-nous membranes, polyethylene PVC or aluminum sheets. In single-layer foundations the damp proof barrier must be put under the screed. In multi-layer foundations, it is generally laid between thescreed and the lightened layer where all the installations havebeen laid.

TWO-LAYER OR MULTI-LAYER FOUNDATIONIf the thickness exceeds 9-10 cm the foundation is generallymulti-layer because under the screed, the remaining thickness ismade with one or more layers that are defined INSULATINGand/or LIGHTENING and/or COMPENSATION layer, accordingto the purpose they were designed for: to isulate, lighten or recoverthickness (drawing B). The screed must be chosen according to the type of flooring tolay. The other layers must be chosen according to the design,the type of floor and the flooring (photo 1).

SCREEDLayer, between 5 and 10 cm thick, on which the flooring is laid.Hence it has to comply with all the requirements that make itappropriate for this (porpose for example: a flat surface suitablefor gluing, with no bleeding, cavities or cracks, with the requiredmoisture content). It could be a “finishing” layer, hence be supportedby a lightened/insulating/compensation layer. If the screed is theonly layer between the floor and the flooring it is called single-layer foundation. Currently it is often defined as “ topping” or“load distribution layer”. (drawing A)

FOUNDATIONS

1 2 3

A) Single-layer screed for the direct laying ofthe flooring.

Thickness between 5and 10 cm.

B) Multi-layer foundationMade up of: • isolating/ lightening

layer;•damp proof barrier

and/or noise isolationlayer;

• finishing screed.

Overall thickness over10 cm.

SYMBOL NAME DESCRIPTION UNIT OF MEASURE

λ (lambda) Thermal Flow of heat transmitted through a structure wall of the same material with thickness of 1 m, conductivity per m2 of surface under steady andsamble conditions with a difference (UNI 10351) of 1 degree Kelvin between the two opposite and parallel sides of the material considered. W/mK

K (U) Transmittance Flow of heat transmitted from one fluid to another under steady state conditions through (UNI EN ISO 6946) one square meter of a structure divided by the difference in temperature of the

two fluids. Particularly it is the flow of heat transmitted from one surface to the outer surface (or room) through one square meter of surface divided by the difference in temperature of the W/ m2Kroom and the outside temperature of that of the adjacent room.

REI Resistance to Formula, followed by a number in minutes, that indicates the time a material subject to fire a controlle fire can guaranted Resistance, Air-tightness and Insulation.

Reaction to Definition of level of participation to a fire. fire It is defined a materials in alphanumerical classes A1 (incombustible), A2, B, C, D, E, F.

Rcm Average Average value of results obtained by finding the compressive strength breking N/mm2

compressive point of a given number of samples. (Kg/cm2)strength

Rck Characteristic Compressive strength value exceeded by at least 95% of the samples N/mm2

compressive subjected to the compressive strength test. (Kg/cm2) strength

dB Decibel A logarithmic unit of measurement of the noise level that expresses the magnitude Numero between the noise pressure and a reference pressure. puro

ΔLw Impact Index of the reduction of the impact sound pressure of the flooring. sound dBinsulation

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S AND LIGHTWEIGHT CONCRETES

LIGHTWEIGHT AND INSULATING GROUTCement aggregate generally with an open structure made up oflightweight aggregates for foundations and roof insulating layers,light fillings and backfills. The mass can vary between 600 and900/1000 Kg/m3 with a mechanical resistance from 25 to 100Kg/cm2. They cannot be reinforced (poor adherence betweeniron and concrete), they are used for lightening layers or thermal insu-lation, for drainage layers or lightweight fillings to be produced on siteor for the production of lightweight and insulating materials (count-er-flues, Exclay blocks, fireplaces, barbecues, etc.). Lightweightgrout with a density between 800 and 900/1000 Kg/m3 is alsoused as a lightening layer in prefabricated “sandwich” panels.

NON-STRUCTURAL LIGHTWEIGHT CONCRETECement aggregate with a closed structure with density between900/1000 and 1400 Kg/m3; average compressive strength at 28days from 100 to 150 Kg/cm2. This type of concrete is used innon-reinforced concrete structures, where the reduction of theweight is important and that have to withstand moderate stress. Itis also used in materials, such as single-block flues, where thermalinsulation, mechanical resistance and fire resistance are importantfactors. The lightweight pre-mixed Lecamix screeds are an exam-ple of non-structural Leca concrete with a closed structure.

STRUCTURAL LIGHTWEIGHT CONCRETE“Cement aggregate with a closed structure obtained by replacingall or in part the ordinary aggregate with an artificial lightweightaggregate, made up of expanded clay or schists (as perMinisterial Decree 9/1/1996 and relating technical instructions).This concrete is characterized by a mass at 28 days between1400 and 2000 Kg/m3. Characteristic compressive strength at 28days must not be lower than 15 N/mm2 (150 Kg/cm2)”. (photo 3)

CONCRETE

TECHNICAL GLOSSARY

EC MARK ON EXCLAY PRODUCTSThe EC mark is necessary to comply with therequirements laid down by the European Directiveon Building Products 89/106/CEE of 1988. Theobjective is to harmonize the existing national legis-lations, establish the essential safety requirementsand assure that the building products comply with the requiredcharacteristics for the construction works for wich will be used.The EC mark indicates that the product is compliant with therequirements of the Directive.Expanded clayThe European standard relating to lightweight aggregates forconcrete and mortar is UNI EN 13055-1 along with annex ZAwhich makes the standard “harmonized” and specifies itscharacteristics, but does not limit the values to declare.Starting from June 1, 2004 Leca, Lecapiù and Sabbia Lecabear the EC mark.ScreedsThe EC mark on screeds are mandatory in compliance withstandard UNI EN 13813 from August 1, 2004.MortarThe EC mark on screeds are mandatory in compliance withstandard UNI EN 998-2. Starting from February 1, 2005LecaMur bears the EC mark. For the summer 2006 the ECmark will be extended to expanded clay as loose product forthermal isolation and for bituminous mixtures.

MINISTERIAL DECREE MAY 10, 2004The health Ministerial Decree of May 10 2004, as acknowledgement of the European Directive 2003/53/CE,establishes that cement and mixtures containing cementcannot be marketed after having been mixed with water, witha concentration of over 2 ppm (parts per million) of water-soluble hexavalent chromium. Starting from January17, 2005 the packaging of all products containing cementmust show the information relating to the packaging date,preservation conditions and the preservation period whichmust be at least 6 months.

Flow of heat transmitted from one fluid to another under steady and stable conditions through awall structure per m2 of surface area and per K level difference in temperature of the two fluids. In particular it is the flow of heat transmitted from one room to the outside (or another room)through a wall structure per m2 of surface area and per K level difference in temperature of theroom and that of the outside temperature, or that of the adjacent room.

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EXPANDED CLAY LATERLITE FOR FOUNDATIONS, COVERINGS, BACKFILLS, FOR LIGHTENING AND INSULATING AVAILABLE INDIFFERENT GRANULATION SIZES, CRUSHED, DRY,STRUCTURAL AND TERRECOTTE

LIGHTWEIGHT, ISOLATING, NATURAL AND ENVIRONMENT-FRIENDLY SOLUTIONS

ADVANTAGES

Lightweight Leca is a lightweight aggregate that thanks to its cellular structureclosed in a hard shell optimizes the weight/resistance ratio.Thermal insulationLeca insulatas and does not deteriorate in time. It can be usedin the creation of permanent thermal insulation works.Fire resistant Leca is "Euroclass A1", according to the Fire PreventionStandards. Baked at 1200 °C it is practically indestructableeven in disastrous fire. It is used as a raw material for fire-proofor refractory products as it is classified as absolutely incom-bustible.Compressive strength Thanks to its outer compact and resistant shell, Leca has a greatcompressive strength. Leca granules stick together with a lowdose of cement, forming lightweight grout which is great forsupporting the loads used on foundations and non-structural con-struction components (floors, partition walls, supports).

Sound isolationThe cellular and porous Leca structure contributes to assuregood noise absorption. Leca can be used for sound and noiseinsulating works.Excellent workabilityLeca mixes well with cement and is easily mixed in normalcement mixers. Leca materials can be nailed and sawed.Unchangeable and resistant in timeLeca does not contain organic materials or byproducts. It doesnot rot, nor does it deteriorate in time, not even under extremetemperature or humidity conditions. It has a high resistanceagainst acids and solvents and maintains its featuresunchanged in time. It does not break nor absorbe water underfreezing temperatures. Basically it is an eternal material.Natural and environmentally-friendlyLeca does not contain, nor releases silica, fibrous substances,Radon gas or other harmful materials, not even in the e vent offire. It is a natural and environmentally-friendly product.Eco-biocompatible Leca is certified by ANAB-ICEA for Bio-architecture.

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EXCLAY: THE FIELDS OF USE FOR FOUNDATIONS, COVERINGS, BA

LOFTSIn lofts Leca,can be used to create a long-lasting insulation layerresistant against rodents or birds. Even with high thickness levelsLeca, is a lightweight solution with an excellent thermal inertia.According to the use, it is used loose if the loft is not servicea-ble, mixed with cement grout or protected with wood-cementsheets if it can be inspected or mixed with a bit of cement andcovered with a finishing screed for serviceable lofts.

FOUNDATIONS AND FLOORINGS Leca is widely used in civil constructions for lightened and insu-lating foundations. Thanks to its low specific weight the Lecalayer allons the creation of layers for the positioning of the instal-lations (electric, sanitary) even with high thickness, yet keepingthe loads on the structures limited. Thanks to the air-filled cavities inside the Leca granules, it is alsopossible to obtain excellent thermal insulating values (the tableshows the trend of the thermal resistance, in m2K/W, accordingto the thickness of mixed Leca of the bag: mixed Leca 3-8 and5 cm of Lecamix). For the floor laying, a finishing screed shouldbe made using lightweight products of the Lecamix line or sandand cement.

FOUNDATIONS AGAINST SOIL It is necessary to put an insulating layer under the flooring laidon the ground to limit the heat dispersion towards the soil. Incivil, industrial and zoo-technical constructions, Leca can beused to create thermal insulating layers against the ground evenwhere floor heating coils will be used or to insulate refrigeration cellswith natural ventilations (the table shows the trend of the thermalresistance, in m2K/W, according to the thickness of the layer ofLeca 8-12 mixed with cement grout). To limit heat dispersiontowards the soil, it is convenient to double the thickness of Lecanear outer walls (approx. 2 m).

FLAT ROOFS AND SLOPE CONSTRUCTION ONROOFSTo create packages of lightweight, safe and insulating roofs,Leca assures the necessary insulating power (the table showsthe trend of the thermal resistance, in m2K/W, according to thethickness of Leca mixed with cement grout, of the coveringpackage formed by: isolation with Leca mixed with cement groutand 5 cm of Lecamix) combined with a high thermal inertia,essential factors for living comfortably both during the summerand winter. It is lightweight, hence the ideal material for making lay-ers, even thick ones, without weighing too much on the structures.It allows for the creation of slopes for the drainage of rain waterand of ballasting of waterproof surfaces. With Leca, mixed withcement, it is possible to create pitched roofs. The solution is safeand long-lasting especially when roof tiles are used. With theappropriate finishing it is also possible to lay water-proof mem-branes.

1 Flooring.2 Lecamix screed.3 Lightweight and insulating Leca layer.4 Floor.5 Elastic mat for impact sound insulation and/or damp proof barrier.

1 Soil.2 Water-proof layer.3 Insulating Leca layer.4 Foundation or industrial flooring.5 Floor heating system.

1 Waterproof membrane.2 Lecamix screed.3 Leca lightweight and/or insulation layer.4 Floor.5 Damp proof barrier.6 Aerator.

1 Lecamix screed.2 Leca lightweight and/or insulation layer.3 Floor.

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ACKFILLS, ROAD EMBANKMENTS, CONCRETE AND OTHER ITEMS

OTHER PRODUCTS Leca (a lightweight, isolating, fire resistant material) is the rawmaterial for many prefabricated components. Lecablocks, pre-fabricated panels, fume stacks, fireplaces and barbecues are allwell-known products.

BACKFILLSDuring the construction of new buildings and more often during therestoration of old buildings it is necessary to use backfills with along-lasting, lightweight and incombustible material: for example,above old structures, vaults, hollow tiles. Leca is great for these appli-cations and even as a filling material under combustible structures (wooden staircases) to enhance its resistance against fireor to create safety barriers around tanks both in and out of service.

LANDSCAPING AND HANGING GARDENSLeca is used as a drainage layer in gardens on flat coverings(underground garages or hanging gardens, flower boxes). Lecaand Agrileca are used in the soil substrate layer and in thedrainage layer to create hanging gardens with or without waterreservoirs for extensive or intensive substrates or hydrated sub-strates.

GEOTECNICAL APPLICATIONS AND ROADS Thanks to its light weight and resistance (high internal frictionangle) Leca is used as a “lightweight gravel” to create roadembankments, lightened foundations, backfills behind bearingwalls and panel walls, stabilization of sides and infills in tunnels andunderground cavities, and in all geotechnical applications. Lecaand Leca Structural allow for the preparation of bituminous mix-tures for sound-proof road surfaces with high adherence.

LIGHTWEIGHT CONCRETE CASTINGLeca can be used to create grout for lightened insulating layers, withhigh fire resistance features for flat coverings, lofts, foundationsagainst ground and backfills. Leca Structural and Exclay Terrecotte(special aggregates for concrete) can be used to create light-weight structural concrete for slabs acting compositely with thestructure, in the restoration of floors and casting of structures onsite or prefabricated with a limited weight.

1 Lecamix screed.2 Leca lightweight and/or insulation layer.3 Structure.4 Elastic mat for impact sound insulation and/or dampred barrier.

1 Planting soil.2 Filtering substrate in non-woven fabric.3 Leca drainage layer.4 Water-proof membrane.5 Structure.

1 Road surface.2 Leca road embankment.3 Mixed granule layer.4 Supporting wall.5 Leca drainage infill.

1 Leca concrete.2 Frame.

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METHODS OF USE

PREPARING THE SURFACEThe floor or supporting surface must not have any cracks or incon-sistent parts, they must have effective compressive and tensilestrength, no dust, paint, waxes, oils, rust and plastering residues. Theinstallations (electric, sanitary) laid on the surface must be ade-quately protected and spaced out one from the other.

APPLICATIONS

Loose LecaTo better exploit its insulating features, Leca must be laid looseand then simply leveled out. This can be done where there areno big slopes, on flat coverings and in lofts. Leca is laid and lev-eled out to the desired thickness. It can be left with a free sur-face (for example in unserviceable lofts) or covered with thinblocks or with wood-cement sheets (serviceable lofts).

Leca mixed with cement groutThis is a technique generally performed by specialized technicians,used to tie together the superficial granules of a layer of loose Leca.Hence, the surface is wormable for the future finishing works(toppings, screeds, etc.). The loose Leca layer, laid in thedesired thickness, is sprayed on top with cement grout (cementand water mixture). The cement grout can be made more orless fluid by changing the water/cement ratio. Normally the ratioused is 0.8-1. According to the fluidity, the cement grout pene-trates more or less into the Leca layer.A finishing layer is necessary.

Mixed Leca – single-grain grout This is frequently used when there is a need for mechanical resist-ance combined with lightness and thermal isolation (insulatinglayers of foundations, lightweight infills and similar). In grout, theadherence between iron and concrete is very limited, hence it cannotbe reinforced.It can be made with any cement mixer, the most common formulation is:• 1 m3 (20 bags) of Leca in the desired grain size;• 150 Kg of cement type 32.5;• 80÷90 litres of clean water (less if the Leca is already wet).

In practice:Pour 3 bags (150 litres) of Leca in the mixer and 10 litres ofwater. Then add 1 bag of cement (25 Kg) and 5 litres of water.For insulating foundations, do not add any sand nor use highercement quantities. The mixture would weigh more and would beless insulating. A finishing layer is necessary.

METHODS OF USE AND OTHER

cemento

3 bags of Leca 10 litres of water

1 bag of cement 25 Kg 5 litres of water

1°

3° 4°

2°

FINISING LAYERTo lay floorings or waterproof membranes on Leca mixed withcement grout of mixed Leca, first create a finishing screed withpre-mixed Lecamix, or sand and cement, that adjusts the sur-face and distributes the loads. For ceramic floors laid “wet” (notglued) the screed is made up of the same laying bed as the tiles.The thickness of the finishing layer ranges from 3 cm forsheaths to 5 cm for house floorings.

OTHER TYPES OF LECA

LIGHTWEIGHT STRUCTURAL CONCRETELeca, Leca Structural and Leca Terrecotte (special aggregates forconcrete) can be used to make lightweight structural concretes withspecific weights from 1400 up to 2000 Kg/m3 as foreseen bythe regulations in force (Ministerial Decree 09-01-96 and relat-ing technical instructions and UNI 7548) with resistance valuesup to 60N/mm2. This concrete allows for significant load reduc-tions while still assuring high resistance levels. Therefore theyare particularly suitable for restoration works. They are also avail-able pre-mixed (see from page 40 to 45) or prepared by cementmixing plants (see from page 56 to 59).

CRUSHED LECAThe Leca production also includes the delivery of crushed mate-rial in gradings 0-2, 0-4 and 2-4. This typology is ideal as anag-gregate for fireplace mixtures, furnaces and fume stacks.Crushed Leca can also be used as fine component in all thelightweight concrete mixtures (for eg. lightweigth blocks) andwherever a fine, lightweight and insulating material is required.

DRY LECALeca is generally delivered with variable humidity levels; it is possi-ble to request a dry material (humidity approx. 1%) in all the avail-able commercial gradings. Dry Leca for its lightness and fire reac-tion properties is the ideal material for preparing lightweight pre-packaged or pre-mixed mortars, refractory mixtures with resinbinders or bitumen. It is ideal as a dry layer for the laying of dryfloorings and wherever a lightweight and insulating material isrequired for applications that do not call for any humidity.

LECA STRUCTURAL AND LECA TERRECOTTEWith special production cycles and clays, from the rotating furnaces that produce Leca it is also possible to produce twoother “types of Leca”: Leca Structural and Leca Terrecotte. Thesematerials are characterized by a lower level of expansion compared to traditional materials with a less expanded inner coreand a thicker and harder outer shell. Thanks to this different granule structure Leca Structural and Leca Terrecottehave a higher specific weight and a significantly higher compressive strength. Hence, they are particularly suitable asaggregates for structural lightened concrete (with compressivestrengths from 25 up to 60 N/mm2); furthermore, witen loose,mixed with cement grout or mixed Leca it is ideal for foundations,road embankments or against bearing structures and for any struc-ture that calls for a lightweight and draining material with highstrength.

TYPES OF LECA

Trend of the average compressive strength according to density, for struc-tural lightweight concrete with the different types of Leca (Leca, LecaStructural and Leca Terrecotte).

Ave

rag

e R

esis

tanc

e N

/mm

2

Impilative density kg/m3

Premix

Average Resistance values

LECA STRUCTURAL CONCRETE

TECHNICAL CHARACTERISTICS

EXCLAY: TECHNICAL CHARACTERISTICS AND DELIVERY MODALIT

Leca Granular CrushedName * 0 - 2 2 - 3 3 - 8 8 - 20 FRT 0 - 2 FRT 2 - 4Density approx. Kg/m3 ** 700 480 380 330 600 350Compressive strengthof granules (UNI EN 13055-1) N/mm2 ** 4.5 2.5 1.5 0.7 - -Dry thermal conductivity W/mK - 0.10 0.09 0.08 - -Fire reaction Euroclass A1 (Incombustible) Euroclass A1 (Incombustible)

Dry Leca Granular CrushedName * 0 - 2 2 - 3 3 - 8 8 - 12 8 - 20 FRT 0 - 2 FRT 2 - 4Density approx. Kg/m3 ** 630 460 360 300 290 580 310Compressive strength of granules (UNI EN 13055-1) N/mm2 ** 4.5 2.5 1.5 1.0 0.7 - -Dry thermal conductivity W/mK - 0.10 0.09 0.09 0.08 - -Fire reaction Euroclass A1 (Incombustibile) Euroclass A1 (Incombustible)

Leca Structural GranularName * 0 - 5 5 - 15 0 - 15Density approx. Kg/m3 ** 770 700 730Compressive strengthof granules (UNI EN 13055-1) N/mm2 ** 10 4.5 6.0Fire reaction Euroclass A1 (Incombustible)

Leca Terrecotte GranularName * 0 - 6 6 - 12 0 - 12Density approx. Kg/m3 ** 950 800 900Compressive strength of granules UNI EN 13055-1) N/mm2 ** 12 7.0 7.5Fire reaction Euroclass A1 (Incombustible)

* “Name” does not refer to the diameter in mm of the granules of Leca but it is a commercial indication.** The densities and the resistance values indicated are just a reference and average values on the yearly production controls of

every Productive Unit with a ± 15% margin as per the UNI standard. For more detailed and updated information, request theproduct sheets of each productive unit.

Refer to the “General warnings” on page 66.

DELIVERY METHODS

TIES

SPECIFICATIONSLOOSE LECAThermal and/or lightened layer made up of “Leca”, type …,laid and compressed, including leveling. Finished thickness cm ...

LECA MIXED WITH CEMENT GROUTThermal insulation and/or lightened layer made up of “Leca”,type 3-8, 8-12 or 8-20, laid and compressed and afterwardsmixed with cement grout in the upper part with cement grout32.5 (a/c 0.8 - 1, with average cement consumption of about12-15 Kg per m2), including leveling. Finished thickness cm ...

MIXED LECAThermal insulating and/or lightened layer made up of “Leca””,type 3-8 o 8-12, mixed with cement type 32.5 calculated as 1.5 tons of cement for every m3 of Leca. Laid,compressed and flattened up to a thickness of cm ...

STRUCTURAL LIGHTWEIGHT CONCRETEStructural lightweight concrete made up of expanded clay(Leca, - Leca Structural - Leca Terrecotte), natural aggregates, cement type … and admixtures. Dry density ofconcrete at 28 days. … (from 1400 up to 2000 Kg/m3).Average compressive strength at 28 days determined oncubes prepared on job site … (from 15 to 50 N/mm2).

IN BAGSLeca and Dry Leca are delivered in 50 litre plastic bags (20bags/m3) on disposable pallets of:• 30 bags (1.5 m3) each for grain size 0-2. • 60 bags (3.0 m3) each for grain size 2-3.• 75 bags (3.75 m3) each for grain size 3-8, 8-12. • 75 bags (3.75 m3) or 80 bags (4 m3) each for grain size 8-20. Leca 3-8, 8-12 and 8-20 are also available on pallets of 35, 50or 65 bags on request.

LOOSELeca, Dry Leca, Crushed Leca, Leca Structural and LecaTerrecotte are delivered with a dumper (hydraulic) with loads ofup to 65 m3 according to the type and size. Different grain sizesmixed together can be supplied at request.

PUMPED Loose with tank trucks equipped to pump the material up to 30m high or horizontally up to 80÷100 m, or in silos. The loads canbe up to 60 m3.

IN BIG BAGLeca, Leca Structural and Leca Terrecotte are delivered (atrequest) in big bags of approx. 2, 1.5 and 1 m3.

PUMPED WITH “LECA CPP” TECHNOLOGYThe “CPP” technology (Continuous Pneumatic Pumping) allowsfor the pumping on site of loose Leca mixed with cement. The necessary equipment is easy to transport, and allows forthe uploading of the cement grout directly from the mixer truckand of Leca directly from the truck. The average productivitydepends on the type of application and can be around 120m3/days (equal to about 2 trucks per day) with quantities ofcement to be calculated according to the use (suggested value250 Kg per m3 of Leca).

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DryLecapiù does not keep humidity. The soakingratio after 30 minutes of soaking is approx. 1%(UNI EN 13055-1)Pumpable Lecapiù can be pumped at certain heights withspecial tank trucks, or with traditional foundation pumps alreadymixed with cement.Lightweight The mass is about 570 Kg/m3 for Lecapiù 0÷4, approx. 360Kg/m3 for Lecapiù 3÷8 and approx. 300 Kg/m3 for Lecapiù8÷12.Practical Lecapiù is packed in 50 litre bags. It mixes well with cement andis easily mixed in standard cement mixers.Thermal insulating materialThanks to its internal structure, Lecapiù has low thermal conductivity levels. It is ideal in the creation of long-lasting thermal insulation works.Resistant Thanks to the compact and resistant outer shell Lecapiù has agood compressive strength. With a low cement dose it is pos-sible to make lightweight grout, ideal for supporting the loads onfoundations.IncombustibleLecapiù has a fire reaction class Euroclass A1 (incombustible): thebest warranty against fire.

THE ONLY WATER-REPELLENT EXPANDED CLAY

ADVANTAGES FIELD OF USE

LECAPIÙSPECIAL EXPANDED CLAY FOR FOUNDATIONS OF FLOORINGS SENSITIVE TO HUMIDITY: WOOD,CERAMIC TILES…

Fillings and thick insulating layers Drainage and thick supports for roofs

Lightened layers of two-layer foun-dations and foundations againstground

Foundations of dry flooring and light-ened layers of single-layer screeds

Lecapiù can be used for all kinds of works just like traditionalLeca and especially where low humidity contents are needed.The grain size 0÷4 is particularly suitable for the dry casting ofwood floors.

1 Wood or ceramic flooring.2 Lecamix screed.3 Lightening/insulating/drainage layer in Lecapiù.4 Floor or existing structure.5 Elastic mat for impact sound insulation and/or damp proof barrier.6 Protecting layer in non-woven fabric. 7 Waterproof membrane.8 Slope layer.

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MIXED WITH CEMENT GROUTLaying procedure It is used for insulating layers and to lighten foundations, espe-cially for big construction works. Allowing to best benefit from theinsulating features of loose Lecapiù that can be pumped at cer-tain heights with special tank trucks. After laying loose Lecapiùat the desired thickness it is sprayed with cement grout whichfixes the grains of the upper surface together. Generally it is laidby specialized operators. The installations (electric and sanitary)must be adequately protected and spaced out one from theother.

MIXEDIt’s the most common system for lightening surfaces and insu-lating layers. It can be mixed with any mixer using: 1 m3 (20 bags)of Lecapiù; 150 Kg of cement type 32.5; 50÷60 litres of water.In practise on uses:• 3 bags of Lecapiù (150 litres);• a bag of cement (Kg 25);• 10 litres of water.For insulating foundations, do not add sand and do not usehigher cement quantities. The mixture would weigh more andwould be less insulating.Preparing the mixture• Put Lecapiù and cement in the mixer and gradually add water.• Mix until the individual grains are covered with a bright cementgrout film (if it is opaque looking or dusty add more water). Toomuch water will make the grains look washed out and brownish. Inthis case add a bit more cement to reach the effect describedabove.Laying procedureLay the mixture to the desired thickness and gently level it out.In summer, to prevent the mixture from drying too much coverit for the first 2-3 days. For better drying results wait one weekbefore laying other layers (for more information see page 66).

FINISHING LAYERThe lightened layers in Leca mixed with cement grout or mixedLecapiù need a finishing layer: from the traditional sand to self-leveling layers. The finishing screed can be made with LecamixFast or Forte, for faster drying times, lighter foundations andless shrinkage and cracking problems.

• Do not wet the laying surface.• Do not wet the Lecapiù layer after casting.• If there are no specific protections, cover the metal tubes with sandand cement mortar.• If there is humidity coming up from the layers below Lecapiù and youplan on using floorings sensitive to humidity, we suggest putting a dampproof barrier between the Lecapiù and the structure below.• Do not apply with temperatures lower than + 5 °C or higher than + 35 °C.• See “General warnings” on page 67.

LECAPIÙ MIXED WITH CEMENT GROUT Thermal insulating and/or lightened layer made up of“Lecapiù” expanded clay, water-repellent type 3-8 or 8-12,(humidity absorption approx. 1% at 30’ according to UNI EN13055-1), laid and compressed and afterwards sprayed onthe upper part with cement grout 32.5 in average quantity ofapprox. 12-15 Kg per m2, including leveling out after spray-ing. Finished thickness cm ...MIXED LECAPIÙ Thermal insulating and/or lightened layer made up of“Lecapiù” expanded clay, type water-repellent 0-4, 3-8 or 8-12, humidity absorption approx. 1% at 30’ according to UNIEN 13055-1) laid and compressed and afterwards sprayedon the upper part with cement grout 32.5 calculated as 1.5tons of cement for every m3 of Lecapiù. Laid, compressedand flattened up. Finished thickness cm …

FIELD OF USEDRY LAYINGBesides being used in the same way as Leca, loose Lecapiù,particularly type 0÷4, is excellent and specific for the dry foundations ofwood flooring. In fact, Lecapiù is laid on the laying surface in the desiredthickness (approx. 5÷15 cm), it is leveled, compressed and thencovered with sheets (plywood, wood-cement, plasterboard). The wood flooring is laid on this surface. The final result is a clean flooring, fast to lay that does not needany water. Hence there is no humidity problem. Make sure no humidity rises from the laying surface, otherwise,use an adequate water-proofing system.

WARNING

SPECIFICATIONS

TECHNICAL FEATURES

Type 0÷4 3÷8 8÷20Density approx. Kg/m3 570 360 300Compressive strength of granules(UNI EN 13055-1) N/mm2 3.5 1.5 1.0Dry thermal conductivity W/mK - 0.09 0.09 Fire reaction Euroclass A1 (Incombustible)Packaging Type 0÷4 in 50 litre/each bag on wood

pallets of 50 bags equal to m3 2.5 (at request 30 bag: m3 1.5);3÷8 and 8÷12 loose and in 50 litre bags on wood pallets of 75 bags equal to m3 3.75 (at request 35 bags: m3 1.75)

LECAPIÙ

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